refactor and organize code

agent/cmd/main.go

@@ -6,7 +6,7 @@ import (
 	"github.com/yusing/go-proxy/agent/pkg/agent"
 	"github.com/yusing/go-proxy/agent/pkg/env"
 	"github.com/yusing/go-proxy/agent/pkg/server"
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/logging"
 	"github.com/yusing/go-proxy/internal/task"
 	"github.com/yusing/go-proxy/pkg"
@@ -16,7 +16,7 @@ func main() {
 	args := os.Args
 	if len(args) > 1 && args[1] == "migrate" {
 		if err := agent.MigrateFromOld(); err != nil {
-			E.LogFatal("failed to migrate from old docker compose", err)
+			gperr.LogFatal("failed to migrate from old docker compose", err)
 		}
 		return
 	}
@@ -24,21 +24,21 @@ func main() {
 	ca := &agent.PEMPair{}
 	err := ca.Load(env.AgentCACert)
 	if err != nil {
-		E.LogFatal("init CA error", err)
+		gperr.LogFatal("init CA error", err)
 	}
 	caCert, err := ca.ToTLSCert()
 	if err != nil {
-		E.LogFatal("init CA error", err)
+		gperr.LogFatal("init CA error", err)
 	}
 
 	srv := &agent.PEMPair{}
 	srv.Load(env.AgentSSLCert)
 	if err != nil {
-		E.LogFatal("init SSL error", err)
+		gperr.LogFatal("init SSL error", err)
 	}
 	srvCert, err := srv.ToTLSCert()
 	if err != nil {
-		E.LogFatal("init SSL error", err)
+		gperr.LogFatal("init SSL error", err)
 	}
 
 	logging.Info().Msgf("GoDoxy Agent version %s", pkg.GetVersion())

agent/pkg/agent/config.go

@@ -12,9 +12,9 @@ import (
 
 	"github.com/rs/zerolog"
 	"github.com/yusing/go-proxy/agent/pkg/certs"
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/logging"
-	gphttp "github.com/yusing/go-proxy/internal/net/http"
+	gphttp "github.com/yusing/go-proxy/internal/net/gphttp"
 	"github.com/yusing/go-proxy/internal/net/types"
 	"github.com/yusing/go-proxy/internal/task"
 	"github.com/yusing/go-proxy/pkg"
@@ -80,17 +80,17 @@ func checkVersion(a, b string) bool {
 	return withoutBuildTime(a) == withoutBuildTime(b)
 }
 
-func (cfg *AgentConfig) StartWithCerts(parent task.Parent, ca, crt, key []byte) E.Error {
+func (cfg *AgentConfig) StartWithCerts(parent task.Parent, ca, crt, key []byte) error {
 	clientCert, err := tls.X509KeyPair(crt, key)
 	if err != nil {
-		return E.Wrap(err)
+		return err
 	}
 
 	// create tls config
 	caCertPool := x509.NewCertPool()
 	ok := caCertPool.AppendCertsFromPEM(ca)
 	if !ok {
-		return E.New("invalid CA certificate")
+		return gperr.New("invalid CA certificate")
 	}
 
 	cfg.tlsConfig = &tls.Config{
@@ -108,17 +108,17 @@ func (cfg *AgentConfig) StartWithCerts(parent task.Parent, ca, crt, key []byte)
 	// check agent version
 	version, _, err := cfg.Fetch(ctx, EndpointVersion)
 	if err != nil {
-		return E.Wrap(err)
+		return err
 	}
 
 	if !checkVersion(string(version), pkg.GetVersion()) {
-		return E.Errorf("agent version mismatch: server: %s, agent: %s", pkg.GetVersion(), string(version))
+		return gperr.Errorf("agent version mismatch: server: %s, agent: %s", pkg.GetVersion(), string(version))
 	}
 
 	// get agent name
 	name, _, err := cfg.Fetch(ctx, EndpointName)
 	if err != nil {
-		return E.Wrap(err)
+		return err
 	}
 
 	cfg.name = string(name)
@@ -128,18 +128,18 @@ func (cfg *AgentConfig) StartWithCerts(parent task.Parent, ca, crt, key []byte)
 	return nil
 }
 
-func (cfg *AgentConfig) Start(parent task.Parent) E.Error {
+func (cfg *AgentConfig) Start(parent task.Parent) error {
 	certData, err := os.ReadFile(certs.AgentCertsFilename(cfg.Addr))
 	if err != nil {
 		if os.IsNotExist(err) {
-			return E.Errorf("agents certs not found, did you run `godoxy new-agent %s ...`?", cfg.Addr)
+			return gperr.Errorf("agents certs not found, did you run `godoxy new-agent %s ...`?", cfg.Addr)
 		}
-		return E.Wrap(err)
+		return gperr.Wrap(err)
 	}
 
 	ca, crt, key, err := certs.ExtractCert(certData)
 	if err != nil {
-		return E.Wrap(err)
+		return gperr.Wrap(err)
 	}
 
 	return cfg.StartWithCerts(parent, ca, crt, key)

agent/pkg/agent/docker_compose.go

@@ -9,7 +9,7 @@ import (
 
 	_ "embed"
 
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/logging"
 	"github.com/yusing/go-proxy/internal/utils"
 	"gopkg.in/yaml.v3"
@@ -110,11 +110,11 @@ func MigrateFromOld() error {
 	composeConfig.SSLCert = agentCert.String()
 	composeTemplate, err := composeConfig.Generate()
 	if err != nil {
-		return E.Wrap(err, "failed to generate new docker compose")
+		return gperr.Wrap(err, "failed to generate new docker compose")
 	}
 
 	if err := os.WriteFile("/app/compose.yml", []byte(composeTemplate), 0600); err != nil {
-		return E.Wrap(err, "failed to write new docker compose")
+		return gperr.Wrap(err, "failed to write new docker compose")
 	}
 
 	logging.Info().Msg("Migrated from old docker compose:")

agent/pkg/handler/check_health.go

@@ -7,7 +7,7 @@ import (
 	"os"
 	"strings"
 
-	apiUtils "github.com/yusing/go-proxy/internal/api/v1/utils"
+	"github.com/yusing/go-proxy/internal/net/gphttp"
 	"github.com/yusing/go-proxy/internal/net/types"
 	"github.com/yusing/go-proxy/internal/watcher/health"
 	"github.com/yusing/go-proxy/internal/watcher/health/monitor"
@@ -72,5 +72,5 @@ func CheckHealth(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	apiUtils.RespondJSON(w, r, result)
+	gphttp.RespondJSON(w, r, result)
 }

agent/pkg/handler/docker_socket.go

@@ -8,7 +8,7 @@ import (
 	"github.com/yusing/go-proxy/internal/common"
 	"github.com/yusing/go-proxy/internal/docker"
 	"github.com/yusing/go-proxy/internal/logging"
-	"github.com/yusing/go-proxy/internal/net/http/reverseproxy"
+	"github.com/yusing/go-proxy/internal/net/gphttp/reverseproxy"
 	"github.com/yusing/go-proxy/internal/net/types"
 )
 

agent/pkg/handler/proxy_http.go

@@ -8,10 +8,10 @@ import (
 	"time"
 
 	"github.com/yusing/go-proxy/agent/pkg/agent"
-	agentproxy "github.com/yusing/go-proxy/agent/pkg/agentproxy"
+	"github.com/yusing/go-proxy/agent/pkg/agentproxy"
 	"github.com/yusing/go-proxy/internal/logging"
-	gphttp "github.com/yusing/go-proxy/internal/net/http"
+	"github.com/yusing/go-proxy/internal/net/gphttp"
-	"github.com/yusing/go-proxy/internal/net/http/reverseproxy"
+	"github.com/yusing/go-proxy/internal/net/gphttp/reverseproxy"
 	"github.com/yusing/go-proxy/internal/net/types"
 	"github.com/yusing/go-proxy/internal/utils/strutils"
 )

agent/pkg/server/server.go

@@ -14,7 +14,7 @@ import (
 	"github.com/yusing/go-proxy/agent/pkg/env"
 	"github.com/yusing/go-proxy/agent/pkg/handler"
 	"github.com/yusing/go-proxy/internal/logging"
-	"github.com/yusing/go-proxy/internal/net/http/server"
+	"github.com/yusing/go-proxy/internal/net/gphttp/server"
 	"github.com/yusing/go-proxy/internal/task"
 )
 

cmd/main.go

@@ -11,10 +11,10 @@ import (
 	"github.com/yusing/go-proxy/internal/api/v1/query"
 	"github.com/yusing/go-proxy/internal/common"
 	"github.com/yusing/go-proxy/internal/config"
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/homepage"
 	"github.com/yusing/go-proxy/internal/logging"
-	"github.com/yusing/go-proxy/internal/net/http/middleware"
+	"github.com/yusing/go-proxy/internal/net/gphttp/middleware"
 	"github.com/yusing/go-proxy/internal/route/routes/routequery"
 	"github.com/yusing/go-proxy/internal/task"
 	"github.com/yusing/go-proxy/pkg"
@@ -32,7 +32,7 @@ func main() {
 		return
 	case common.CommandReload:
 		if err := query.ReloadServer(); err != nil {
-			E.LogFatal("server reload error", err)
+			gperr.LogFatal("server reload error", err)
 		}
 		rawLogger.Println("ok")
 		return
@@ -88,9 +88,9 @@ func main() {
 	middleware.LoadComposeFiles()
 
 	var cfg *config.Config
-	var err E.Error
+	var err gperr.Error
 	if cfg, err = config.Load(); err != nil {
-		E.LogWarn("errors in config", err)
+		gperr.LogWarn("errors in config", err)
 	}
 
 	switch args.Command {

internal/api/handler.go

@@ -13,7 +13,7 @@ import (
 	"github.com/yusing/go-proxy/internal/logging"
 	"github.com/yusing/go-proxy/internal/logging/memlogger"
 	"github.com/yusing/go-proxy/internal/metrics/uptime"
-	"github.com/yusing/go-proxy/internal/net/http/httpheaders"
+	"github.com/yusing/go-proxy/internal/net/gphttp/httpheaders"
 	"github.com/yusing/go-proxy/internal/utils/strutils"
 )
 

internal/api/v1/agents.go

@@ -6,18 +6,19 @@ import (
 
 	"github.com/coder/websocket"
 	"github.com/coder/websocket/wsjson"
-	U "github.com/yusing/go-proxy/internal/api/v1/utils"
 	config "github.com/yusing/go-proxy/internal/config/types"
-	"github.com/yusing/go-proxy/internal/net/http/httpheaders"
+	"github.com/yusing/go-proxy/internal/net/gphttp"
+	"github.com/yusing/go-proxy/internal/net/gphttp/gpwebsocket"
+	"github.com/yusing/go-proxy/internal/net/gphttp/httpheaders"
 )
 
 func ListAgents(cfg config.ConfigInstance, w http.ResponseWriter, r *http.Request) {
 	if httpheaders.IsWebsocket(r.Header) {
-		U.PeriodicWS(w, r, 10*time.Second, func(conn *websocket.Conn) error {
+		gpwebsocket.Periodic(w, r, 10*time.Second, func(conn *websocket.Conn) error {
 			wsjson.Write(r.Context(), conn, cfg.ListAgents())
 			return nil
 		})
 	} else {
-		U.RespondJSON(w, r, cfg.ListAgents())
+		gphttp.RespondJSON(w, r, cfg.ListAgents())
 	}
 }

internal/api/v1/auth/auth.go

@@ -3,9 +3,9 @@ package auth
 import (
 	"net/http"
 
-	U "github.com/yusing/go-proxy/internal/api/v1/utils"
 	"github.com/yusing/go-proxy/internal/common"
 	"github.com/yusing/go-proxy/internal/logging"
+	"github.com/yusing/go-proxy/internal/net/gphttp"
 )
 
 var defaultAuth Provider
@@ -44,7 +44,7 @@ func RequireAuth(next http.HandlerFunc) http.HandlerFunc {
 	if IsEnabled() {
 		return func(w http.ResponseWriter, r *http.Request) {
 			if err := defaultAuth.CheckToken(r); err != nil {
-				U.RespondError(w, err, http.StatusUnauthorized)
+				gphttp.ClientError(w, err, http.StatusUnauthorized)
 			} else {
 				next(w, r)
 			}

internal/api/v1/auth/oidc.go

@@ -12,9 +12,8 @@ import (
 	"time"
 
 	"github.com/coreos/go-oidc/v3/oidc"
-	U "github.com/yusing/go-proxy/internal/api/v1/utils"
 	"github.com/yusing/go-proxy/internal/common"
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/net/gphttp"
 	CE "github.com/yusing/go-proxy/internal/utils"
 	"github.com/yusing/go-proxy/internal/utils/strutils"
 	"golang.org/x/oauth2"
@@ -154,7 +153,7 @@ func generateState() (string, error) {
 func (auth *OIDCProvider) RedirectLoginPage(w http.ResponseWriter, r *http.Request) {
 	state, err := generateState()
 	if err != nil {
-		U.HandleErr(w, r, err, http.StatusInternalServerError)
+		gphttp.ServerError(w, r, err)
 		return
 	}
 	http.SetCookie(w, &http.Cookie{
@@ -171,7 +170,7 @@ func (auth *OIDCProvider) RedirectLoginPage(w http.ResponseWriter, r *http.Reque
 	if auth.isMiddleware {
 		u, err := r.URL.Parse(redirURL)
 		if err != nil {
-			U.HandleErr(w, r, err, http.StatusInternalServerError)
+			gphttp.ServerError(w, r, err)
 			return
 		}
 		q := u.Query()
@@ -201,31 +200,31 @@ func (auth *OIDCProvider) LoginCallbackHandler(w http.ResponseWriter, r *http.Re
 
 	state, err := r.Cookie(CookieOauthState)
 	if err != nil {
-		U.HandleErr(w, r, E.New("missing state cookie"), http.StatusBadRequest)
+		gphttp.BadRequest(w, "missing state cookie")
 		return
 	}
 
 	query := r.URL.Query()
 	if query.Get("state") != state.Value {
-		U.HandleErr(w, r, E.New("invalid oauth state"), http.StatusBadRequest)
+		gphttp.BadRequest(w, "invalid oauth state")
 		return
 	}
 
 	oauth2Token, err := auth.exchange(r)
 	if err != nil {
-		U.HandleErr(w, r, fmt.Errorf("failed to exchange token: %w", err), http.StatusInternalServerError)
+		gphttp.ServerError(w, r, fmt.Errorf("failed to exchange token: %w", err))
 		return
 	}
 
 	rawIDToken, ok := oauth2Token.Extra("id_token").(string)
 	if !ok {
-		U.HandleErr(w, r, E.New("missing id_token"), http.StatusInternalServerError)
+		gphttp.BadRequest(w, "missing id_token")
 		return
 	}
 
 	idToken, err := auth.oidcVerifier.Verify(r.Context(), rawIDToken)
 	if err != nil {
-		U.HandleErr(w, r, fmt.Errorf("failed to verify ID token: %w", err), http.StatusInternalServerError)
+		gphttp.ServerError(w, r, fmt.Errorf("failed to verify ID token: %w", err))
 		return
 	}
 
@@ -243,7 +242,7 @@ func (auth *OIDCProvider) LogoutCallbackHandler(w http.ResponseWriter, r *http.R
 
 	token, err := r.Cookie(auth.TokenCookieName())
 	if err != nil {
-		U.HandleErr(w, r, E.New("missing token cookie"), http.StatusBadRequest)
+		gphttp.BadRequest(w, "missing token cookie")
 		return
 	}
 	clearTokenCookie(w, r, auth.TokenCookieName())
@@ -258,12 +257,12 @@ func (auth *OIDCProvider) LogoutCallbackHandler(w http.ResponseWriter, r *http.R
 func (auth *OIDCProvider) handleTestCallback(w http.ResponseWriter, r *http.Request) {
 	state, err := r.Cookie(CookieOauthState)
 	if err != nil {
-		U.HandleErr(w, r, E.New("missing state cookie"), http.StatusBadRequest)
+		gphttp.BadRequest(w, "missing state cookie")
 		return
 	}
 
 	if r.URL.Query().Get("state") != state.Value {
-		U.HandleErr(w, r, E.New("invalid oauth state"), http.StatusBadRequest)
+		gphttp.BadRequest(w, "invalid oauth state")
 		return
 	}
 

internal/api/v1/auth/userpass.go

@@ -7,16 +7,16 @@ import (
 	"time"
 
 	"github.com/golang-jwt/jwt/v5"
-	U "github.com/yusing/go-proxy/internal/api/v1/utils"
 	"github.com/yusing/go-proxy/internal/common"
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
+	"github.com/yusing/go-proxy/internal/net/gphttp"
 	"github.com/yusing/go-proxy/internal/utils/strutils"
 	"golang.org/x/crypto/bcrypt"
 )
 
 var (
-	ErrInvalidUsername = E.New("invalid username")
+	ErrInvalidUsername = gperr.New("invalid username")
-	ErrInvalidPassword = E.New("invalid password")
+	ErrInvalidPassword = gperr.New("invalid password")
 )
 
 type (
@@ -94,7 +94,7 @@ func (auth *UserPassAuth) CheckToken(r *http.Request) error {
 	case claims.Username != auth.username:
 		return ErrUserNotAllowed.Subject(claims.Username)
 	case claims.ExpiresAt.Before(time.Now()):
-		return E.Errorf("token expired on %s", strutils.FormatTime(claims.ExpiresAt.Time))
+		return gperr.Errorf("token expired on %s", strutils.FormatTime(claims.ExpiresAt.Time))
 	}
 
 	return nil
@@ -111,17 +111,16 @@ func (auth *UserPassAuth) LoginCallbackHandler(w http.ResponseWriter, r *http.Re
 	}
 	err := json.NewDecoder(r.Body).Decode(&creds)
 	if err != nil {
-		U.HandleErr(w, r, err, http.StatusBadRequest)
+		gphttp.Unauthorized(w, "invalid credentials")
 		return
 	}
 	if err := auth.validatePassword(creds.User, creds.Pass); err != nil {
-		U.LogError(r).Err(err).Msg("auth: invalid credentials")
+		gphttp.Unauthorized(w, "invalid credentials")
-		U.RespondError(w, E.New("invalid credentials"), http.StatusUnauthorized)
 		return
 	}
 	token, err := auth.NewToken()
 	if err != nil {
-		U.HandleErr(w, r, err, http.StatusInternalServerError)
+		gphttp.ServerError(w, r, err)
 		return
 	}
 	setTokenCookie(w, r, auth.TokenCookieName(), token, auth.tokenTTL)

internal/api/v1/auth/utils.go

@@ -5,14 +5,14 @@ import (
 	"net/http"
 	"time"
 
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/utils/strutils"
 )
 
 var (
-	ErrMissingToken   = E.New("missing token")
+	ErrMissingToken   = gperr.New("missing token")
-	ErrInvalidToken   = E.New("invalid token")
+	ErrInvalidToken   = gperr.New("invalid token")
-	ErrUserNotAllowed = E.New("user not allowed")
+	ErrUserNotAllowed = gperr.New("user not allowed")
 )
 
 // cookieFQDN returns the fully qualified domain name of the request host

internal/api/v1/favicon/favicon.go

@@ -13,10 +13,10 @@ import (
 
 	"github.com/PuerkitoBio/goquery"
 	"github.com/vincent-petithory/dataurl"
-	U "github.com/yusing/go-proxy/internal/api/v1/utils"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/homepage"
 	"github.com/yusing/go-proxy/internal/logging"
-	gphttp "github.com/yusing/go-proxy/internal/net/http"
+	gphttp "github.com/yusing/go-proxy/internal/net/gphttp"
 	"github.com/yusing/go-proxy/internal/route/routes"
 	route "github.com/yusing/go-proxy/internal/route/types"
 )
@@ -53,11 +53,11 @@ func (res *fetchResult) ContentType() string {
 func GetFavIcon(w http.ResponseWriter, req *http.Request) {
 	url, alias := req.FormValue("url"), req.FormValue("alias")
 	if url == "" && alias == "" {
-		U.RespondError(w, U.ErrMissingKey("url or alias"), http.StatusBadRequest)
+		gphttp.ClientError(w, gphttp.ErrMissingKey("url or alias"), http.StatusBadRequest)
 		return
 	}
 	if url != "" && alias != "" {
-		U.RespondError(w, U.ErrInvalidKey("url and alias are mutually exclusive"), http.StatusBadRequest)
+		gphttp.ClientError(w, gperr.New("url and alias are mutually exclusive"), http.StatusBadRequest)
 		return
 	}
 
@@ -65,7 +65,7 @@ func GetFavIcon(w http.ResponseWriter, req *http.Request) {
 	if url != "" {
 		var iconURL homepage.IconURL
 		if err := iconURL.Parse(url); err != nil {
-			U.RespondError(w, err, http.StatusBadRequest)
+			gphttp.ClientError(w, err, http.StatusBadRequest)
 			return
 		}
 		fetchResult := getFavIconFromURL(&iconURL)
@@ -74,14 +74,14 @@ func GetFavIcon(w http.ResponseWriter, req *http.Request) {
 			return
 		}
 		w.Header().Set("Content-Type", fetchResult.ContentType())
-		U.WriteBody(w, fetchResult.icon)
+		gphttp.WriteBody(w, fetchResult.icon)
 		return
 	}
 
 	// try with route.Homepage.Icon
 	r, ok := routes.GetHTTPRoute(alias)
 	if !ok {
-		U.RespondError(w, errors.New("no such route"), http.StatusNotFound)
+		gphttp.ClientError(w, errors.New("no such route"), http.StatusNotFound)
 		return
 	}
 
@@ -105,7 +105,7 @@ func GetFavIcon(w http.ResponseWriter, req *http.Request) {
 		return
 	}
 	w.Header().Set("Content-Type", result.ContentType())
-	U.WriteBody(w, result.icon)
+	gphttp.WriteBody(w, result.icon)
 }
 
 func getFavIconFromURL(iconURL *homepage.IconURL) *fetchResult {
@@ -125,7 +125,7 @@ func fetchIconAbsolute(url string) *fetchResult {
 		return result
 	}
 
-	resp, err := U.Get(url)
+	resp, err := gphttp.Get(url)
 	if err != nil || resp.StatusCode != http.StatusOK {
 		if err == nil {
 			err = errors.New(resp.Status)

internal/api/v1/file.go

@@ -7,11 +7,11 @@ import (
 	"path"
 	"strings"
 
-	U "github.com/yusing/go-proxy/internal/api/v1/utils"
 	"github.com/yusing/go-proxy/internal/common"
 	config "github.com/yusing/go-proxy/internal/config/types"
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
-	"github.com/yusing/go-proxy/internal/net/http/middleware"
+	"github.com/yusing/go-proxy/internal/net/gphttp"
+	"github.com/yusing/go-proxy/internal/net/gphttp/middleware"
 	"github.com/yusing/go-proxy/internal/route/provider"
 )
 
@@ -51,12 +51,12 @@ func (t FileType) GetPath(filename string) string {
 func getArgs(r *http.Request) (fileType FileType, filename string, err error) {
 	fileType = FileType(r.PathValue("type"))
 	if !fileType.IsValid() {
-		err = U.ErrInvalidKey("type")
+		err = gphttp.ErrInvalidKey("type")
 		return
 	}
 	filename = r.PathValue("filename")
 	if filename == "" {
-		err = U.ErrMissingKey("filename")
+		err = gphttp.ErrMissingKey("filename")
 	}
 	return
 }
@@ -64,23 +64,23 @@ func getArgs(r *http.Request) (fileType FileType, filename string, err error) {
 func GetFileContent(w http.ResponseWriter, r *http.Request) {
 	fileType, filename, err := getArgs(r)
 	if err != nil {
-		U.RespondError(w, err, http.StatusBadRequest)
+		gphttp.BadRequest(w, err.Error())
 		return
 	}
 	content, err := os.ReadFile(fileType.GetPath(filename))
 	if err != nil {
-		U.HandleErr(w, r, err)
+		gphttp.ServerError(w, r, err)
 		return
 	}
-	U.WriteBody(w, content)
+	gphttp.WriteBody(w, content)
 }
 
-func validateFile(fileType FileType, content []byte) error {
+func validateFile(fileType FileType, content []byte) gperr.Error {
 	switch fileType {
 	case FileTypeConfig:
 		return config.Validate(content)
 	case FileTypeMiddleware:
-		errs := E.NewBuilder("middleware errors")
+		errs := gperr.NewBuilder("middleware errors")
 		middleware.BuildMiddlewaresFromYAML("", content, errs)
 		return errs.Error()
 	}
@@ -90,18 +90,17 @@ func validateFile(fileType FileType, content []byte) error {
 func ValidateFile(w http.ResponseWriter, r *http.Request) {
 	fileType := FileType(r.PathValue("type"))
 	if !fileType.IsValid() {
-		U.RespondError(w, U.ErrInvalidKey("type"), http.StatusBadRequest)
+		gphttp.BadRequest(w, "invalid file type")
 		return
 	}
 	content, err := io.ReadAll(r.Body)
 	if err != nil {
-		U.HandleErr(w, r, err)
+		gphttp.ServerError(w, r, err)
 		return
 	}
 	r.Body.Close()
-	err = validateFile(fileType, content)
+	if valErr := validateFile(fileType, content); valErr != nil {
-	if err != nil {
+		gphttp.JSONError(w, valErr, http.StatusBadRequest)
-		U.RespondError(w, err, http.StatusBadRequest)
 		return
 	}
 	w.WriteHeader(http.StatusOK)
@@ -110,23 +109,23 @@ func ValidateFile(w http.ResponseWriter, r *http.Request) {
 func SetFileContent(w http.ResponseWriter, r *http.Request) {
 	fileType, filename, err := getArgs(r)
 	if err != nil {
-		U.RespondError(w, err, http.StatusBadRequest)
+		gphttp.BadRequest(w, err.Error())
 		return
 	}
 	content, err := io.ReadAll(r.Body)
 	if err != nil {
-		U.HandleErr(w, r, err)
+		gphttp.ServerError(w, r, err)
 		return
 	}
 
 	if valErr := validateFile(fileType, content); valErr != nil {
-		U.RespondError(w, valErr, http.StatusBadRequest)
+		gphttp.JSONError(w, valErr, http.StatusBadRequest)
 		return
 	}
 
 	err = os.WriteFile(fileType.GetPath(filename), content, 0o644)
 	if err != nil {
-		U.HandleErr(w, r, err)
+		gphttp.ServerError(w, r, err)
 		return
 	}
 	w.WriteHeader(http.StatusOK)

internal/api/v1/health.go

@@ -6,17 +6,18 @@ import (
 
 	"github.com/coder/websocket"
 	"github.com/coder/websocket/wsjson"
-	U "github.com/yusing/go-proxy/internal/api/v1/utils"
+	"github.com/yusing/go-proxy/internal/net/gphttp"
-	"github.com/yusing/go-proxy/internal/net/http/httpheaders"
+	"github.com/yusing/go-proxy/internal/net/gphttp/gpwebsocket"
+	"github.com/yusing/go-proxy/internal/net/gphttp/httpheaders"
 	"github.com/yusing/go-proxy/internal/route/routes/routequery"
 )
 
 func Health(w http.ResponseWriter, r *http.Request) {
 	if httpheaders.IsWebsocket(r.Header) {
-		U.PeriodicWS(w, r, 1*time.Second, func(conn *websocket.Conn) error {
+		gpwebsocket.Periodic(w, r, 1*time.Second, func(conn *websocket.Conn) error {
 			return wsjson.Write(r.Context(), conn, routequery.HealthMap())
 		})
 	} else {
-		U.RespondJSON(w, r, routequery.HealthMap())
+		gphttp.RespondJSON(w, r, routequery.HealthMap())
 	}
 }

internal/api/v1/homepage_overrides.go

@@ -5,8 +5,8 @@ import (
 	"io"
 	"net/http"
 
-	"github.com/yusing/go-proxy/internal/api/v1/utils"
 	"github.com/yusing/go-proxy/internal/homepage"
+	"github.com/yusing/go-proxy/internal/net/gphttp"
 )
 
 const (
@@ -37,13 +37,13 @@ type (
 func SetHomePageOverrides(w http.ResponseWriter, r *http.Request) {
 	what := r.FormValue("what")
 	if what == "" {
-		http.Error(w, "missing what or which", http.StatusBadRequest)
+		gphttp.BadRequest(w, "missing what or which")
 		return
 	}
 
 	data, err := io.ReadAll(r.Body)
 	if err != nil {
-		utils.RespondError(w, err, http.StatusBadRequest)
+		gphttp.ClientError(w, err, http.StatusBadRequest)
 		return
 	}
 	r.Body.Close()
@@ -53,21 +53,21 @@ func SetHomePageOverrides(w http.ResponseWriter, r *http.Request) {
 	case HomepageOverrideItem:
 		var params HomepageOverrideItemParams
 		if err := json.Unmarshal(data, &params); err != nil {
-			utils.RespondError(w, err, http.StatusBadRequest)
+			gphttp.ClientError(w, err, http.StatusBadRequest)
 			return
 		}
 		overrides.OverrideItem(params.Which, &params.Value)
 	case HomepageOverrideItemsBatch:
 		var params HomepageOverrideItemsBatchParams
 		if err := json.Unmarshal(data, &params); err != nil {
-			utils.RespondError(w, err, http.StatusBadRequest)
+			gphttp.ClientError(w, err, http.StatusBadRequest)
 			return
 		}
 		overrides.OverrideItems(params.Value)
 	case HomepageOverrideItemVisible: // POST /v1/item_visible [a,b,c], false => hide a, b, c
 		var params HomepageOverrideItemVisibleParams
 		if err := json.Unmarshal(data, &params); err != nil {
-			utils.RespondError(w, err, http.StatusBadRequest)
+			gphttp.ClientError(w, err, http.StatusBadRequest)
 			return
 		}
 		if params.Value {
@@ -78,7 +78,7 @@ func SetHomePageOverrides(w http.ResponseWriter, r *http.Request) {
 	case HomepageOverrideCategoryOrder:
 		var params HomepageOverrideCategoryOrderParams
 		if err := json.Unmarshal(data, &params); err != nil {
-			utils.RespondError(w, err, http.StatusBadRequest)
+			gphttp.ClientError(w, err, http.StatusBadRequest)
 			return
 		}
 		overrides.SetCategoryOrder(params.Which, params.Value)

internal/api/v1/index.go

@@ -3,9 +3,9 @@ package v1
 import (
 	"net/http"
 
-	. "github.com/yusing/go-proxy/internal/api/v1/utils"
+	"github.com/yusing/go-proxy/internal/net/gphttp"
 )
 
 func Index(w http.ResponseWriter, r *http.Request) {
-	WriteBody(w, []byte("API ready"))
+	gphttp.WriteBody(w, []byte("API ready"))
 }

internal/api/v1/list.go

@@ -1,15 +1,16 @@
 package v1
 
 import (
+	"fmt"
 	"net/http"
 	"strconv"
 	"strings"
 
 	"github.com/yusing/go-proxy/internal"
-	U "github.com/yusing/go-proxy/internal/api/v1/utils"
 	"github.com/yusing/go-proxy/internal/common"
 	config "github.com/yusing/go-proxy/internal/config/types"
-	"github.com/yusing/go-proxy/internal/net/http/middleware"
+	"github.com/yusing/go-proxy/internal/net/gphttp"
+	"github.com/yusing/go-proxy/internal/net/gphttp/middleware"
 	"github.com/yusing/go-proxy/internal/route/routes/routequery"
 	route "github.com/yusing/go-proxy/internal/route/types"
 	"github.com/yusing/go-proxy/internal/task"
@@ -41,26 +42,25 @@ func List(cfg config.ConfigInstance, w http.ResponseWriter, r *http.Request) {
 	case ListRoute:
 		if route := listRoute(which); route == nil {
 			http.NotFound(w, r)
-			return
 		} else {
-			U.RespondJSON(w, r, route)
+			gphttp.RespondJSON(w, r, route)
 		}
 	case ListRoutes:
-		U.RespondJSON(w, r, routequery.RoutesByAlias(route.RouteType(r.FormValue("type"))))
+		gphttp.RespondJSON(w, r, routequery.RoutesByAlias(route.RouteType(r.FormValue("type"))))
 	case ListFiles:
 		listFiles(w, r)
 	case ListMiddlewares:
-		U.RespondJSON(w, r, middleware.All())
+		gphttp.RespondJSON(w, r, middleware.All())
 	case ListMiddlewareTraces:
-		U.RespondJSON(w, r, middleware.GetAllTrace())
+		gphttp.RespondJSON(w, r, middleware.GetAllTrace())
 	case ListMatchDomains:
-		U.RespondJSON(w, r, cfg.Value().MatchDomains)
+		gphttp.RespondJSON(w, r, cfg.Value().MatchDomains)
 	case ListHomepageConfig:
-		U.RespondJSON(w, r, routequery.HomepageConfig(cfg.Value().Homepage.UseDefaultCategories, r.FormValue("category"), r.FormValue("provider")))
+		gphttp.RespondJSON(w, r, routequery.HomepageConfig(cfg.Value().Homepage.UseDefaultCategories, r.FormValue("category"), r.FormValue("provider")))
 	case ListRouteProviders:
-		U.RespondJSON(w, r, cfg.RouteProviderList())
+		gphttp.RespondJSON(w, r, cfg.RouteProviderList())
 	case ListHomepageCategories:
-		U.RespondJSON(w, r, routequery.HomepageCategories())
+		gphttp.RespondJSON(w, r, routequery.HomepageCategories())
 	case ListIcons:
 		limit, err := strconv.Atoi(r.FormValue("limit"))
 		if err != nil {
@@ -68,17 +68,17 @@ func List(cfg config.ConfigInstance, w http.ResponseWriter, r *http.Request) {
 		}
 		icons, err := internal.SearchIcons(r.FormValue("keyword"), limit)
 		if err != nil {
-			U.RespondError(w, err)
+			gphttp.ClientError(w, err)
 			return
 		}
 		if icons == nil {
 			icons = []string{}
 		}
-		U.RespondJSON(w, r, icons)
+		gphttp.RespondJSON(w, r, icons)
 	case ListTasks:
-		U.RespondJSON(w, r, task.DebugTaskList())
+		gphttp.RespondJSON(w, r, task.DebugTaskList())
 	default:
-		U.HandleErr(w, r, U.ErrInvalidKey("what"), http.StatusBadRequest)
+		gphttp.BadRequest(w, fmt.Sprintf("invalid what: %s", what))
 	}
 }
 
@@ -99,7 +99,7 @@ func listRoute(which string) any {
 func listFiles(w http.ResponseWriter, r *http.Request) {
 	files, err := utils.ListFiles(common.ConfigBasePath, 0, true)
 	if err != nil {
-		U.HandleErr(w, r, err)
+		gphttp.ServerError(w, r, err)
 		return
 	}
 	resp := map[FileType][]string{
@@ -116,12 +116,12 @@ func listFiles(w http.ResponseWriter, r *http.Request) {
 
 	mids, err := utils.ListFiles(common.MiddlewareComposeBasePath, 0, true)
 	if err != nil {
-		U.HandleErr(w, r, err)
+		gphttp.ServerError(w, r, err)
 		return
 	}
 	for _, mid := range mids {
 		mid = strings.TrimPrefix(mid, common.MiddlewareComposeBasePath+"/")
 		resp[FileTypeMiddleware] = append(resp[FileTypeMiddleware], mid)
 	}
-	U.RespondJSON(w, r, resp)
+	gphttp.RespondJSON(w, r, resp)
 }

internal/api/v1/new_agent.go

@@ -12,8 +12,9 @@ import (
 
 	"github.com/yusing/go-proxy/agent/pkg/agent"
 	"github.com/yusing/go-proxy/agent/pkg/certs"
-	U "github.com/yusing/go-proxy/internal/api/v1/utils"
 	config "github.com/yusing/go-proxy/internal/config/types"
+	"github.com/yusing/go-proxy/internal/gperr"
+	"github.com/yusing/go-proxy/internal/net/gphttp"
 	"github.com/yusing/go-proxy/internal/utils/strutils"
 )
 
@@ -21,27 +22,27 @@ func NewAgent(w http.ResponseWriter, r *http.Request) {
 	q := r.URL.Query()
 	name := q.Get("name")
 	if name == "" {
-		U.RespondError(w, U.ErrMissingKey("name"))
+		gphttp.ClientError(w, gphttp.ErrMissingKey("name"))
 		return
 	}
 	host := q.Get("host")
 	if host == "" {
-		U.RespondError(w, U.ErrMissingKey("host"))
+		gphttp.ClientError(w, gphttp.ErrMissingKey("host"))
 		return
 	}
 	portStr := q.Get("port")
 	if portStr == "" {
-		U.RespondError(w, U.ErrMissingKey("port"))
+		gphttp.ClientError(w, gphttp.ErrMissingKey("port"))
 		return
 	}
 	port, err := strconv.Atoi(portStr)
 	if err != nil || port < 1 || port > 65535 {
-		U.RespondError(w, U.ErrInvalidKey("port"))
+		gphttp.ClientError(w, gphttp.ErrInvalidKey("port"))
 		return
 	}
 	hostport := fmt.Sprintf("%s:%d", host, port)
 	if _, ok := config.GetInstance().GetAgent(hostport); ok {
-		U.RespondError(w, U.ErrAlreadyExists("agent", hostport), http.StatusConflict)
+		gphttp.ClientError(w, gphttp.ErrAlreadyExists("agent", hostport), http.StatusConflict)
 		return
 	}
 	t := q.Get("type")
@@ -49,13 +50,13 @@ func NewAgent(w http.ResponseWriter, r *http.Request) {
 	case "docker":
 		break
 	case "system":
-		U.RespondError(w, U.Errorf("system agent is not supported yet"), http.StatusNotImplemented)
+		gphttp.ClientError(w, gperr.Errorf("system agent is not supported yet"), http.StatusNotImplemented)
 		return
 	case "":
-		U.RespondError(w, U.ErrMissingKey("type"))
+		gphttp.ClientError(w, gphttp.ErrMissingKey("type"))
 		return
 	default:
-		U.RespondError(w, U.ErrInvalidKey("type"))
+		gphttp.ClientError(w, gphttp.ErrInvalidKey("type"))
 		return
 	}
 
@@ -69,7 +70,7 @@ func NewAgent(w http.ResponseWriter, r *http.Request) {
 
 	ca, srv, client, err := agent.NewAgent()
 	if err != nil {
-		U.HandleErr(w, r, err)
+		gphttp.ServerError(w, r, err)
 		return
 	}
 
@@ -83,11 +84,11 @@ func NewAgent(w http.ResponseWriter, r *http.Request) {
 
 	template, err := cfg.Generate()
 	if err != nil {
-		U.HandleErr(w, r, err)
+		gphttp.ServerError(w, r, err)
 		return
 	}
 
-	U.RespondJSON(w, r, map[string]any{
+	gphttp.RespondJSON(w, r, map[string]any{
 		"compose": template,
 		"ca":      ca,
 		"client":  client,
@@ -98,7 +99,7 @@ func AddAgent(w http.ResponseWriter, r *http.Request) {
 	defer r.Body.Close()
 	clientPEMData, err := io.ReadAll(r.Body)
 	if err != nil {
-		U.HandleErr(w, r, err)
+		gphttp.ServerError(w, r, err)
 		return
 	}
 
@@ -109,24 +110,24 @@ func AddAgent(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if err := json.Unmarshal(clientPEMData, &data); err != nil {
-		U.RespondError(w, err, http.StatusBadRequest)
+		gphttp.ClientError(w, err, http.StatusBadRequest)
 		return
 	}
 
 	nRoutesAdded, err := config.GetInstance().AddAgent(data.Host, data.CA, data.Client)
 	if err != nil {
-		U.RespondError(w, err)
+		gphttp.ClientError(w, err)
 		return
 	}
 
 	zip, err := certs.ZipCert(data.CA.Cert, data.Client.Cert, data.Client.Key)
 	if err != nil {
-		U.HandleErr(w, r, err)
+		gphttp.ServerError(w, r, err)
 		return
 	}
 
 	if err := os.WriteFile(certs.AgentCertsFilename(data.Host), zip, 0600); err != nil {
-		U.HandleErr(w, r, err)
+		gphttp.ServerError(w, r, err)
 		return
 	}
 

internal/api/v1/query/query.go

@@ -7,20 +7,20 @@ import (
 	"net/http"
 
 	v1 "github.com/yusing/go-proxy/internal/api/v1"
-	U "github.com/yusing/go-proxy/internal/api/v1/utils"
 	"github.com/yusing/go-proxy/internal/common"
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
-	"github.com/yusing/go-proxy/internal/net/http/middleware"
+	"github.com/yusing/go-proxy/internal/net/gphttp"
+	"github.com/yusing/go-proxy/internal/net/gphttp/middleware"
 )
 
-func ReloadServer() E.Error {
+func ReloadServer() gperr.Error {
-	resp, err := U.Post(common.APIHTTPURL+"/v1/reload", "", nil)
+	resp, err := gphttp.Post(common.APIHTTPURL+"/v1/reload", "", nil)
 	if err != nil {
-		return E.From(err)
+		return gperr.Wrap(err)
 	}
 	defer resp.Body.Close()
 	if resp.StatusCode != http.StatusOK {
-		failure := E.Errorf("server reload status %v", resp.StatusCode)
+		failure := gperr.Errorf("server reload status %v", resp.StatusCode)
 		body, err := io.ReadAll(resp.Body)
 		if err != nil {
 			return failure.With(err)
@@ -31,34 +31,34 @@ func ReloadServer() E.Error {
 	return nil
 }
 
-func List[T any](what string) (_ T, outErr E.Error) {
+func List[T any](what string) (_ T, outErr gperr.Error) {
-	resp, err := U.Get(fmt.Sprintf("%s/v1/list/%s", common.APIHTTPURL, what))
+	resp, err := gphttp.Get(fmt.Sprintf("%s/v1/list/%s", common.APIHTTPURL, what))
 	if err != nil {
-		outErr = E.From(err)
+		outErr = gperr.Wrap(err)
 		return
 	}
 	defer resp.Body.Close()
 	if resp.StatusCode != http.StatusOK {
-		outErr = E.Errorf("list %s: failed, status %v", what, resp.StatusCode)
+		outErr = gperr.Errorf("list %s: failed, status %v", what, resp.StatusCode)
 		return
 	}
 	var res T
 	err = json.NewDecoder(resp.Body).Decode(&res)
 	if err != nil {
-		outErr = E.From(err)
+		outErr = gperr.Wrap(err)
 		return
 	}
 	return res, nil
 }
 
-func ListRoutes() (map[string]map[string]any, E.Error) {
+func ListRoutes() (map[string]map[string]any, gperr.Error) {
 	return List[map[string]map[string]any](v1.ListRoutes)
 }
 
-func ListMiddlewareTraces() (middleware.Traces, E.Error) {
+func ListMiddlewareTraces() (middleware.Traces, gperr.Error) {
 	return List[middleware.Traces](v1.ListMiddlewareTraces)
 }
 
-func DebugListTasks() (map[string]any, E.Error) {
+func DebugListTasks() (map[string]any, gperr.Error) {
 	return List[map[string]any](v1.ListTasks)
 }

internal/api/v1/reload.go

@@ -3,14 +3,14 @@ package v1
 import (
 	"net/http"
 
-	U "github.com/yusing/go-proxy/internal/api/v1/utils"
 	config "github.com/yusing/go-proxy/internal/config/types"
+	"github.com/yusing/go-proxy/internal/net/gphttp"
 )
 
 func Reload(cfg config.ConfigInstance, w http.ResponseWriter, r *http.Request) {
 	if err := cfg.Reload(); err != nil {
-		U.HandleErr(w, r, err)
+		gphttp.ServerError(w, r, err)
 		return
 	}
-	U.WriteBody(w, []byte("OK"))
+	gphttp.WriteBody(w, []byte("OK"))
 }

internal/api/v1/stats.go

@@ -6,19 +6,20 @@ import (
 
 	"github.com/coder/websocket"
 	"github.com/coder/websocket/wsjson"
-	U "github.com/yusing/go-proxy/internal/api/v1/utils"
 	config "github.com/yusing/go-proxy/internal/config/types"
-	"github.com/yusing/go-proxy/internal/net/http/httpheaders"
+	"github.com/yusing/go-proxy/internal/net/gphttp"
+	"github.com/yusing/go-proxy/internal/net/gphttp/gpwebsocket"
+	"github.com/yusing/go-proxy/internal/net/gphttp/httpheaders"
 	"github.com/yusing/go-proxy/internal/utils/strutils"
 )
 
 func Stats(cfg config.ConfigInstance, w http.ResponseWriter, r *http.Request) {
 	if httpheaders.IsWebsocket(r.Header) {
-		U.PeriodicWS(w, r, 1*time.Second, func(conn *websocket.Conn) error {
+		gpwebsocket.Periodic(w, r, 1*time.Second, func(conn *websocket.Conn) error {
 			return wsjson.Write(r.Context(), conn, getStats(cfg))
 		})
 	} else {
-		U.RespondJSON(w, r, getStats(cfg))
+		gphttp.RespondJSON(w, r, getStats(cfg))
 	}
 }
 

internal/api/v1/system_info.go

@@ -4,12 +4,12 @@ import (
 	"net/http"
 
 	agentPkg "github.com/yusing/go-proxy/agent/pkg/agent"
-	U "github.com/yusing/go-proxy/internal/api/v1/utils"
 	config "github.com/yusing/go-proxy/internal/config/types"
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/metrics/systeminfo"
-	"github.com/yusing/go-proxy/internal/net/http/httpheaders"
+	"github.com/yusing/go-proxy/internal/net/gphttp"
-	"github.com/yusing/go-proxy/internal/net/http/reverseproxy"
+	"github.com/yusing/go-proxy/internal/net/gphttp/httpheaders"
+	"github.com/yusing/go-proxy/internal/net/gphttp/reverseproxy"
 )
 
 func SystemInfo(cfg config.ConfigInstance, w http.ResponseWriter, r *http.Request) {
@@ -23,7 +23,7 @@ func SystemInfo(cfg config.ConfigInstance, w http.ResponseWriter, r *http.Reques
 
 	agent, ok := cfg.GetAgent(agentAddr)
 	if !ok {
-		U.HandleErr(w, r, U.ErrInvalidKey("agent_addr"), http.StatusNotFound)
+		gphttp.NotFound(w, "agent_addr")
 		return
 	}
 
@@ -31,20 +31,20 @@ func SystemInfo(cfg config.ConfigInstance, w http.ResponseWriter, r *http.Reques
 	if !isWS {
 		respData, status, err := agent.Forward(r, agentPkg.EndpointSystemInfo)
 		if err != nil {
-			U.HandleErr(w, r, E.Wrap(err, "failed to forward request to agent"))
+			gphttp.ServerError(w, r, gperr.Wrap(err, "failed to forward request to agent"))
 			return
 		}
 		if status != http.StatusOK {
 			http.Error(w, string(respData), status)
 			return
 		}
-		U.WriteBody(w, respData)
+		gphttp.WriteBody(w, respData)
 	} else {
 		rp := reverseproxy.NewReverseProxy("agent", agentPkg.AgentURL, agent.Transport())
 		header := r.Header.Clone()
 		r, err := http.NewRequestWithContext(r.Context(), r.Method, agentPkg.EndpointSystemInfo+"?"+query.Encode(), nil)
 		if err != nil {
-			U.HandleErr(w, r, E.Wrap(err, "failed to create request"))
+			gphttp.ServerError(w, r, gperr.Wrap(err, "failed to create request"))
 			return
 		}
 		r.Header = header

internal/api/v1/utils/error.go

@@ -1,66 +0,0 @@
-package utils
-
-import (
-	"context"
-	"errors"
-	"net/http"
-	"syscall"
-
-	E "github.com/yusing/go-proxy/internal/error"
-	"github.com/yusing/go-proxy/internal/net/http/httpheaders"
-	"github.com/yusing/go-proxy/internal/utils/strutils/ansi"
-)
-
-// HandleErr logs the error and returns an error code to the client.
-// If code is specified, it will be used as the HTTP status code; otherwise,
-// http.StatusInternalServerError is used.
-//
-// The error is only logged but not returned to the client.
-func HandleErr(w http.ResponseWriter, r *http.Request, err error, code ...int) {
-	switch {
-	case err == nil,
-		errors.Is(err, context.Canceled),
-		errors.Is(err, syscall.EPIPE),
-		errors.Is(err, syscall.ECONNRESET):
-		return
-	}
-	LogError(r).Msg(err.Error())
-	if httpheaders.IsWebsocket(r.Header) {
-		return
-	}
-	if len(code) == 0 {
-		code = []int{http.StatusInternalServerError}
-	}
-	http.Error(w, http.StatusText(code[0]), code[0])
-}
-
-// RespondError returns error details to the client.
-// If code is specified, it will be used as the HTTP status code; otherwise,
-// http.StatusBadRequest is used.
-func RespondError(w http.ResponseWriter, err error, code ...int) {
-	if len(code) == 0 {
-		code = []int{http.StatusBadRequest}
-	}
-	w.Header().Set("Content-Type", "text/plain; charset=utf-8")
-	http.Error(w, ansi.StripANSI(err.Error()), code[0])
-}
-
-func Errorf(format string, args ...any) error {
-	return E.Errorf(format, args...)
-}
-
-func ErrMissingKey(k string) error {
-	return E.New(k + " is required")
-}
-
-func ErrInvalidKey(k string) error {
-	return E.New(k + " is invalid")
-}
-
-func ErrAlreadyExists(k, v string) error {
-	return E.Errorf("%s %q already exists", k, v)
-}
-
-func ErrNotFound(k, v string) error {
-	return E.Errorf("%s %q not found", k, v)
-}

internal/api/v1/version.go

@@ -3,10 +3,10 @@ package v1
 import (
 	"net/http"
 
-	. "github.com/yusing/go-proxy/internal/api/v1/utils"
+	"github.com/yusing/go-proxy/internal/net/gphttp"
 	"github.com/yusing/go-proxy/pkg"
 )
 
 func GetVersion(w http.ResponseWriter, r *http.Request) {
-	WriteBody(w, []byte(pkg.GetVersion()))
+	gphttp.WriteBody(w, []byte(pkg.GetVersion()))
 }

internal/autocert/config.go

@@ -10,7 +10,7 @@ import (
 
 	"github.com/go-acme/lego/v4/certcrypto"
 	"github.com/go-acme/lego/v4/lego"
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/logging"
 	"github.com/yusing/go-proxy/internal/utils"
 	"github.com/yusing/go-proxy/internal/utils/strutils"
@@ -30,17 +30,17 @@ type (
 )
 
 var (
-	ErrMissingDomain   = E.New("missing field 'domains'")
+	ErrMissingDomain   = gperr.New("missing field 'domains'")
-	ErrMissingEmail    = E.New("missing field 'email'")
+	ErrMissingEmail    = gperr.New("missing field 'email'")
-	ErrMissingProvider = E.New("missing field 'provider'")
+	ErrMissingProvider = gperr.New("missing field 'provider'")
-	ErrInvalidDomain   = E.New("invalid domain")
+	ErrInvalidDomain   = gperr.New("invalid domain")
-	ErrUnknownProvider = E.New("unknown provider")
+	ErrUnknownProvider = gperr.New("unknown provider")
 )
 
 var domainOrWildcardRE = regexp.MustCompile(`^\*?([^.]+\.)+[^.]+$`)
 
 // Validate implements the utils.CustomValidator interface.
-func (cfg *AutocertConfig) Validate() E.Error {
+func (cfg *AutocertConfig) Validate() gperr.Error {
 	if cfg == nil {
 		return nil
 	}
@@ -50,7 +50,7 @@ func (cfg *AutocertConfig) Validate() E.Error {
 		return nil
 	}
 
-	b := E.NewBuilder("autocert errors")
+	b := gperr.NewBuilder("autocert errors")
 	if cfg.Provider != ProviderLocal {
 		if len(cfg.Domains) == 0 {
 			b.Add(ErrMissingDomain)
@@ -79,7 +79,7 @@ func (cfg *AutocertConfig) Validate() E.Error {
 	return b.Error()
 }
 
-func (cfg *AutocertConfig) GetProvider() (*Provider, E.Error) {
+func (cfg *AutocertConfig) GetProvider() (*Provider, gperr.Error) {
 	if cfg == nil {
 		cfg = new(AutocertConfig)
 	}
@@ -107,10 +107,10 @@ func (cfg *AutocertConfig) GetProvider() (*Provider, E.Error) {
 			logging.Info().Msg("generate new ACME private key")
 			privKey, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
 			if err != nil {
-				return nil, E.New("generate ACME private key").With(err)
+				return nil, gperr.New("generate ACME private key").With(err)
 			}
 			if err = cfg.saveACMEKey(privKey); err != nil {
-				return nil, E.New("save ACME private key").With(err)
+				return nil, gperr.New("save ACME private key").With(err)
 			}
 		}
 	}

internal/autocert/provider.go

@@ -4,6 +4,7 @@ import (
 	"crypto/tls"
 	"crypto/x509"
 	"errors"
+	"fmt"
 	"os"
 	"path"
 	"reflect"
@@ -14,7 +15,7 @@ import (
 	"github.com/go-acme/lego/v4/challenge"
 	"github.com/go-acme/lego/v4/lego"
 	"github.com/go-acme/lego/v4/registration"
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/logging"
 	"github.com/yusing/go-proxy/internal/task"
 	U "github.com/yusing/go-proxy/internal/utils"
@@ -32,7 +33,7 @@ type (
 		tlsCert      *tls.Certificate
 		certExpiries CertExpiries
 	}
-	ProviderGenerator func(ProviderOpt) (challenge.Provider, E.Error)
+	ProviderGenerator func(ProviderOpt) (challenge.Provider, gperr.Error)
 
 	CertExpiries map[string]time.Time
 )
@@ -62,7 +63,7 @@ func (p *Provider) GetExpiries() CertExpiries {
 	return p.certExpiries
 }
 
-func (p *Provider) ObtainCert() E.Error {
+func (p *Provider) ObtainCert() error {
 	if p.cfg.Provider == ProviderLocal {
 		return nil
 	}
@@ -75,7 +76,7 @@ func (p *Provider) ObtainCert() E.Error {
 
 	if p.user.Registration == nil {
 		if err := p.registerACME(); err != nil {
-			return E.From(err)
+			return err
 		}
 	}
 
@@ -100,22 +101,22 @@ func (p *Provider) ObtainCert() E.Error {
 			Bundle:  true,
 		})
 		if err != nil {
-			return E.From(err)
+			return err
 		}
 	}
 
 	if err = p.saveCert(cert); err != nil {
-		return E.From(err)
+		return err
 	}
 
 	tlsCert, err := tls.X509KeyPair(cert.Certificate, cert.PrivateKey)
 	if err != nil {
-		return E.From(err)
+		return err
 	}
 
 	expiries, err := getCertExpiries(&tlsCert)
 	if err != nil {
-		return E.From(err)
+		return err
 	}
 	p.tlsCert = &tlsCert
 	p.certExpiries = expiries
@@ -123,14 +124,14 @@ func (p *Provider) ObtainCert() E.Error {
 	return nil
 }
 
-func (p *Provider) LoadCert() E.Error {
+func (p *Provider) LoadCert() error {
 	cert, err := tls.LoadX509KeyPair(p.cfg.CertPath, p.cfg.KeyPath)
 	if err != nil {
-		return E.Errorf("load SSL certificate: %w", err)
+		return fmt.Errorf("load SSL certificate: %w", err)
 	}
 	expiries, err := getCertExpiries(&cert)
 	if err != nil {
-		return E.Errorf("parse SSL certificate: %w", err)
+		return fmt.Errorf("parse SSL certificate: %w", err)
 	}
 	p.tlsCert = &cert
 	p.certExpiries = expiries
@@ -171,7 +172,7 @@ func (p *Provider) ScheduleRenewal(parent task.Parent) {
 					continue
 				}
 				if err := p.renewIfNeeded(); err != nil {
-					E.LogWarn("cert renew failed", err)
+					gperr.LogWarn("cert renew failed", err)
 					lastErrOn = time.Now()
 					continue
 				}
@@ -184,10 +185,10 @@ func (p *Provider) ScheduleRenewal(parent task.Parent) {
 	}()
 }
 
-func (p *Provider) initClient() E.Error {
+func (p *Provider) initClient() error {
 	legoClient, err := lego.NewClient(p.legoCfg)
 	if err != nil {
-		return E.From(err)
+		return err
 	}
 
 	generator := providersGenMap[p.cfg.Provider]
@@ -198,7 +199,7 @@ func (p *Provider) initClient() E.Error {
 
 	err = legoClient.Challenge.SetDNS01Provider(legoProvider)
 	if err != nil {
-		return E.From(err)
+		return err
 	}
 
 	p.client = legoClient
@@ -273,7 +274,7 @@ func (p *Provider) certState() CertState {
 	return CertStateValid
 }
 
-func (p *Provider) renewIfNeeded() E.Error {
+func (p *Provider) renewIfNeeded() error {
 	if p.cfg.Provider == ProviderLocal {
 		return nil
 	}
@@ -312,13 +313,13 @@ func providerGenerator[CT any, PT challenge.Provider](
 	defaultCfg func() *CT,
 	newProvider func(*CT) (PT, error),
 ) ProviderGenerator {
-	return func(opt ProviderOpt) (challenge.Provider, E.Error) {
+	return func(opt ProviderOpt) (challenge.Provider, gperr.Error) {
 		cfg := defaultCfg()
 		err := U.Deserialize(opt, &cfg)
 		if err != nil {
 			return nil, err
 		}
 		p, pErr := newProvider(cfg)
-		return p, E.From(pErr)
+		return p, gperr.Wrap(pErr)
 	}
 }

internal/autocert/setup.go

@@ -1,16 +1,16 @@
 package autocert
 
 import (
+	"errors"
 	"os"
 
-	E "github.com/yusing/go-proxy/internal/error"
 	"github.com/yusing/go-proxy/internal/logging"
 	"github.com/yusing/go-proxy/internal/utils/strutils"
 )
 
-func (p *Provider) Setup() (err E.Error) {
+func (p *Provider) Setup() (err error) {
 	if err = p.LoadCert(); err != nil {
-		if !err.Is(os.ErrNotExist) { // ignore if cert doesn't exist
+		if !errors.Is(err, os.ErrNotExist) { // ignore if cert doesn't exist
 			return err
 		}
 		logging.Debug().Msg("obtaining cert due to error loading cert")

internal/common/constants.go

@@ -4,12 +4,6 @@ import (
 	"time"
 )
 
-const (
-	ConnectionTimeout = 5 * time.Second
-	DialTimeout       = 3 * time.Second
-	KeepAlive         = 60 * time.Second
-)
-
 // file, folder structure
 
 const (
@@ -50,5 +44,3 @@ const (
 	StopTimeoutDefault = "30s"
 	StopMethodDefault  = "stop"
 )
-
-const HeaderCheckRedirect = "X-Goproxy-Check-Redirect"

internal/config/agent_pool.go

@@ -2,7 +2,7 @@ package config
 
 import (
 	"github.com/yusing/go-proxy/agent/pkg/agent"
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/route/provider"
 	"github.com/yusing/go-proxy/internal/utils/functional"
 )
@@ -29,12 +29,12 @@ func (cfg *Config) GetAgent(agentAddrOrDockerHost string) (*agent.AgentConfig, b
 	return GetAgent(agent.GetAgentAddrFromDockerHost(agentAddrOrDockerHost))
 }
 
-func (cfg *Config) AddAgent(host string, ca agent.PEMPair, client agent.PEMPair) (int, E.Error) {
+func (cfg *Config) AddAgent(host string, ca agent.PEMPair, client agent.PEMPair) (int, gperr.Error) {
 	var agentCfg agent.AgentConfig
 	agentCfg.Addr = host
 	err := agentCfg.StartWithCerts(cfg.Task(), ca.Cert, client.Cert, client.Key)
 	if err != nil {
-		return 0, err
+		return 0, gperr.Wrap(err, "failed to start agent")
 	}
 
 	provider := provider.NewAgentProvider(&agentCfg)

internal/config/config.go

@@ -14,9 +14,9 @@ import (
 	"github.com/yusing/go-proxy/internal/common"
 	config "github.com/yusing/go-proxy/internal/config/types"
 	"github.com/yusing/go-proxy/internal/entrypoint"
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/logging"
-	"github.com/yusing/go-proxy/internal/net/http/server"
+	"github.com/yusing/go-proxy/internal/net/gphttp/server"
 	"github.com/yusing/go-proxy/internal/notif"
 	proxy "github.com/yusing/go-proxy/internal/route/provider"
 	"github.com/yusing/go-proxy/internal/task"
@@ -64,7 +64,7 @@ func newConfig() *Config {
 	}
 }
 
-func Load() (*Config, E.Error) {
+func Load() (*Config, gperr.Error) {
 	if config.HasInstance() {
 		panic(errors.New("config already loaded"))
 	}
@@ -84,8 +84,8 @@ func WatchChanges() {
 		t,
 		configEventFlushInterval,
 		OnConfigChange,
-		func(err E.Error) {
+		func(err gperr.Error) {
-			E.LogError("config reload error", err)
+			gperr.LogError("config reload error", err)
 		},
 	)
 	eventQueue.Start(cfgWatcher.Events(t.Context()))
@@ -109,7 +109,7 @@ func OnConfigChange(ev []events.Event) {
 	}
 }
 
-func Reload() E.Error {
+func Reload() gperr.Error {
 	// avoid race between config change and API reload request
 	reloadMu.Lock()
 	defer reloadMu.Unlock()
@@ -118,7 +118,7 @@ func Reload() E.Error {
 	err := newCfg.load()
 	if err != nil {
 		newCfg.task.Finish(err)
-		return E.New("using last config").With(err)
+		return gperr.New("using last config").With(err)
 	}
 
 	// cancel all current subtasks -> wait
@@ -133,10 +133,13 @@ func (cfg *Config) Value() *config.Config {
 	return cfg.value
 }
 
-func (cfg *Config) Reload() E.Error {
+func (cfg *Config) Reload() gperr.Error {
 	return Reload()
 }
 
+// AutoCertProvider returns the autocert provider.
+//
+// If the autocert provider is not configured, it returns nil.
 func (cfg *Config) AutoCertProvider() *autocert.Provider {
 	return cfg.autocertProvider
 }
@@ -163,7 +166,7 @@ func (cfg *Config) StartAutoCert() {
 	}
 
 	if err := autocert.Setup(); err != nil {
-		E.LogFatal("autocert setup error", err)
+		gperr.LogFatal("autocert setup error", err)
 	} else {
 		autocert.ScheduleRenewal(cfg.task)
 	}
@@ -175,8 +178,8 @@ func (cfg *Config) StartProxyProviders() {
 			return p.Start(cfg.task)
 		})
 
-	if err := E.Join(errs...); err != nil {
+	if err := gperr.Join(errs...); err != nil {
-		E.LogError("route provider errors", err)
+		gperr.LogError("route provider errors", err)
 	}
 }
 
@@ -210,21 +213,21 @@ func (cfg *Config) StartServers(opts ...*StartServersOptions) {
 	}
 }
 
-func (cfg *Config) load() E.Error {
+func (cfg *Config) load() gperr.Error {
 	const errMsg = "config load error"
 
 	data, err := os.ReadFile(common.ConfigPath)
 	if err != nil {
-		E.LogFatal(errMsg, err)
+		gperr.LogFatal(errMsg, err)
 	}
 
 	model := config.DefaultConfig()
 	if err := utils.DeserializeYAML(data, model); err != nil {
-		E.LogFatal(errMsg, err)
+		gperr.LogFatal(errMsg, err)
 	}
 
 	// errors are non fatal below
-	errs := E.NewBuilder(errMsg)
+	errs := gperr.NewBuilder(errMsg)
 	errs.Add(cfg.entrypoint.SetMiddlewares(model.Entrypoint.Middlewares))
 	errs.Add(cfg.entrypoint.SetAccessLogger(cfg.task, model.Entrypoint.AccessLog))
 	cfg.initNotification(model.Providers.Notification)
@@ -252,7 +255,7 @@ func (cfg *Config) initNotification(notifCfg []notif.NotificationConfig) {
 	}
 }
 
-func (cfg *Config) initAutoCert(autocertCfg *autocert.AutocertConfig) (err E.Error) {
+func (cfg *Config) initAutoCert(autocertCfg *autocert.AutocertConfig) (err gperr.Error) {
 	if cfg.autocertProvider != nil {
 		return
 	}
@@ -261,9 +264,9 @@ func (cfg *Config) initAutoCert(autocertCfg *autocert.AutocertConfig) (err E.Err
 	return
 }
 
-func (cfg *Config) errIfExists(p *proxy.Provider) E.Error {
+func (cfg *Config) errIfExists(p *proxy.Provider) gperr.Error {
 	if _, ok := cfg.providers.Load(p.String()); ok {
-		return E.Errorf("provider %s already exists", p.String())
+		return gperr.Errorf("provider %s already exists", p.String())
 	}
 	return nil
 }
@@ -272,9 +275,9 @@ func (cfg *Config) storeProvider(p *proxy.Provider) {
 	cfg.providers.Store(p.String(), p)
 }
 
-func (cfg *Config) loadRouteProviders(providers *config.Providers) E.Error {
+func (cfg *Config) loadRouteProviders(providers *config.Providers) gperr.Error {
-	errs := E.NewBuilder("route provider errors")
+	errs := gperr.NewBuilder("route provider errors")
-	results := E.NewBuilder("loaded route providers")
+	results := gperr.NewBuilder("loaded route providers")
 
 	removeAllAgents()
 
@@ -297,7 +300,7 @@ func (cfg *Config) loadRouteProviders(providers *config.Providers) E.Error {
 			err = cfg.errIfExists(p)
 		}
 		if err != nil {
-			errs.Add(E.PrependSubject(filename, err))
+			errs.Add(gperr.PrependSubject(filename, err))
 			continue
 		}
 		cfg.storeProvider(p)

internal/config/types/config.go

@@ -8,11 +8,10 @@ import (
 	"github.com/go-playground/validator/v10"
 	"github.com/yusing/go-proxy/agent/pkg/agent"
 	"github.com/yusing/go-proxy/internal/autocert"
-	"github.com/yusing/go-proxy/internal/net/http/accesslog"
+	"github.com/yusing/go-proxy/internal/gperr"
+	"github.com/yusing/go-proxy/internal/net/gphttp/accesslog"
 	"github.com/yusing/go-proxy/internal/notif"
 	"github.com/yusing/go-proxy/internal/utils"
-
-	E "github.com/yusing/go-proxy/internal/error"
 )
 
 type (
@@ -37,12 +36,12 @@ type (
 
 	ConfigInstance interface {
 		Value() *Config
-		Reload() E.Error
+		Reload() gperr.Error
 		Statistics() map[string]any
 		RouteProviderList() []string
 		Context() context.Context
 		GetAgent(agentAddrOrDockerHost string) (*agent.AgentConfig, bool)
-		AddAgent(host string, ca agent.PEMPair, client agent.PEMPair) (int, E.Error)
+		AddAgent(host string, ca agent.PEMPair, client agent.PEMPair) (int, gperr.Error)
 		ListAgents() []*agent.AgentConfig
 	}
 )
@@ -79,7 +78,7 @@ func HasInstance() bool {
 	return instance != nil
 }
 
-func Validate(data []byte) E.Error {
+func Validate(data []byte) gperr.Error {
 	var model Config
 	return utils.DeserializeYAML(data, &model)
 }

internal/docker/idlewatcher/loading_page.go

@@ -6,7 +6,7 @@ import (
 	"strings"
 	"text/template"
 
-	"github.com/yusing/go-proxy/internal/common"
+	"github.com/yusing/go-proxy/internal/net/gphttp/httpheaders"
 )
 
 type templateData struct {
@@ -23,11 +23,11 @@ func (w *Watcher) makeLoadingPageBody() []byte {
 	msg := w.ContainerName + " is starting..."
 
 	data := new(templateData)
-	data.CheckRedirectHeader = common.HeaderCheckRedirect
+	data.CheckRedirectHeader = httpheaders.HeaderGoDoxyCheckRedirect
 	data.Title = w.ContainerName
 	data.Message = strings.ReplaceAll(msg, " ", " ")
 
-	buf := bytes.NewBuffer(make([]byte, len(loadingPage)+len(data.Title)+len(data.Message)+len(common.HeaderCheckRedirect)))
+	buf := bytes.NewBuffer(make([]byte, len(loadingPage)+len(data.Title)+len(data.Message)+len(httpheaders.HeaderGoDoxyCheckRedirect)))
 	err := loadingPageTmpl.Execute(buf, data)
 	if err != nil { // should never happen in production
 		panic(err)

internal/docker/idlewatcher/types/config.go

@@ -7,7 +7,7 @@ import (
 	"time"
 
 	"github.com/yusing/go-proxy/internal/docker"
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 )
 
 type (
@@ -40,7 +40,7 @@ var validSignals = map[string]struct{}{
 	"INT": {}, "TERM": {}, "HUP": {}, "QUIT": {},
 }
 
-func ValidateConfig(cont *docker.Container) (*Config, E.Error) {
+func ValidateConfig(cont *docker.Container) (*Config, gperr.Error) {
 	if cont == nil {
 		return nil, nil
 	}
@@ -54,14 +54,14 @@ func ValidateConfig(cont *docker.Container) (*Config, E.Error) {
 		}, nil
 	}
 
-	errs := E.NewBuilder("invalid idlewatcher config")
+	errs := gperr.NewBuilder("invalid idlewatcher config")
 
-	idleTimeout := E.Collect(errs, validateDurationPostitive, cont.IdleTimeout)
+	idleTimeout := gperr.Collect(errs, validateDurationPostitive, cont.IdleTimeout)
-	wakeTimeout := E.Collect(errs, validateDurationPostitive, cont.WakeTimeout)
+	wakeTimeout := gperr.Collect(errs, validateDurationPostitive, cont.WakeTimeout)
-	stopTimeout := E.Collect(errs, validateDurationPostitive, cont.StopTimeout)
+	stopTimeout := gperr.Collect(errs, validateDurationPostitive, cont.StopTimeout)
-	stopMethod := E.Collect(errs, validateStopMethod, cont.StopMethod)
+	stopMethod := gperr.Collect(errs, validateStopMethod, cont.StopMethod)
-	signal := E.Collect(errs, validateSignal, cont.StopSignal)
+	signal := gperr.Collect(errs, validateSignal, cont.StopSignal)
-	startEndpoint := E.Collect(errs, validateStartEndpoint, cont.StartEndpoint)
+	startEndpoint := gperr.Collect(errs, validateStartEndpoint, cont.StartEndpoint)
 
 	if errs.HasError() {
 		return nil, errs.Error()

internal/docker/idlewatcher/waker.go

@@ -5,9 +5,9 @@ import (
 	"time"
 
 	"github.com/yusing/go-proxy/internal/docker/idlewatcher/types"
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/metrics"
-	"github.com/yusing/go-proxy/internal/net/http/reverseproxy"
+	"github.com/yusing/go-proxy/internal/net/gphttp/reverseproxy"
 	net "github.com/yusing/go-proxy/internal/net/types"
 	route "github.com/yusing/go-proxy/internal/route/types"
 	"github.com/yusing/go-proxy/internal/task"
@@ -37,7 +37,7 @@ const (
 
 // TODO: support stream
 
-func newWaker(parent task.Parent, route route.Route, rp *reverseproxy.ReverseProxy, stream net.Stream) (Waker, E.Error) {
+func newWaker(parent task.Parent, route route.Route, rp *reverseproxy.ReverseProxy, stream net.Stream) (Waker, gperr.Error) {
 	hcCfg := route.HealthCheckConfig()
 	hcCfg.Timeout = idleWakerCheckTimeout
 
@@ -48,7 +48,7 @@ func newWaker(parent task.Parent, route route.Route, rp *reverseproxy.ReversePro
 	task := parent.Subtask("idlewatcher." + route.TargetName())
 	watcher, err := registerWatcher(task, route, waker)
 	if err != nil {
-		return nil, E.Errorf("register watcher: %w", err)
+		return nil, gperr.Errorf("register watcher: %w", err)
 	}
 
 	switch {
@@ -66,16 +66,16 @@ func newWaker(parent task.Parent, route route.Route, rp *reverseproxy.ReversePro
 }
 
 // lifetime should follow route provider.
-func NewHTTPWaker(parent task.Parent, route route.Route, rp *reverseproxy.ReverseProxy) (Waker, E.Error) {
+func NewHTTPWaker(parent task.Parent, route route.Route, rp *reverseproxy.ReverseProxy) (Waker, gperr.Error) {
 	return newWaker(parent, route, rp, nil)
 }
 
-func NewStreamWaker(parent task.Parent, route route.Route, stream net.Stream) (Waker, E.Error) {
+func NewStreamWaker(parent task.Parent, route route.Route, stream net.Stream) (Waker, gperr.Error) {
 	return newWaker(parent, route, nil, stream)
 }
 
 // Start implements health.HealthMonitor.
-func (w *Watcher) Start(parent task.Parent) E.Error {
+func (w *Watcher) Start(parent task.Parent) gperr.Error {
 	w.task.OnCancel("route_cleanup", func() {
 		parent.Finish(w.task.FinishCause())
 		if w.metric != nil {

internal/docker/idlewatcher/waker_http.go

@@ -7,8 +7,8 @@ import (
 	"strconv"
 	"time"
 
-	"github.com/yusing/go-proxy/internal/common"
+	gphttp "github.com/yusing/go-proxy/internal/net/gphttp"
-	gphttp "github.com/yusing/go-proxy/internal/net/http"
+	"github.com/yusing/go-proxy/internal/net/gphttp/httpheaders"
 	"github.com/yusing/go-proxy/internal/watcher/health"
 )
 
@@ -63,7 +63,7 @@ func (w *Watcher) wakeFromHTTP(rw http.ResponseWriter, r *http.Request) (shouldN
 	accept := gphttp.GetAccept(r.Header)
 	acceptHTML := (r.Method == http.MethodGet && accept.AcceptHTML() || r.RequestURI == "/" && accept.IsEmpty())
 
-	isCheckRedirect := r.Header.Get(common.HeaderCheckRedirect) != ""
+	isCheckRedirect := r.Header.Get(httpheaders.HeaderGoDoxyCheckRedirect) != ""
 	if !isCheckRedirect && acceptHTML {
 		// Send a loading response to the client
 		body := w.makeLoadingPageBody()

internal/docker/idlewatcher/watcher.go

@@ -10,7 +10,7 @@ import (
 	"github.com/rs/zerolog"
 	D "github.com/yusing/go-proxy/internal/docker"
 	idlewatcher "github.com/yusing/go-proxy/internal/docker/idlewatcher/types"
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/logging"
 	route "github.com/yusing/go-proxy/internal/route/types"
 	"github.com/yusing/go-proxy/internal/task"
@@ -180,7 +180,7 @@ func (w *Watcher) wakeIfStopped() error {
 	case "running":
 		return nil
 	default:
-		return E.Errorf("unexpected container status: %s", status)
+		return gperr.Errorf("unexpected container status: %s", status)
 	}
 }
 
@@ -213,7 +213,7 @@ func (w *Watcher) expires() time.Time {
 	return w.lastReset.Add(w.IdleTimeout)
 }
 
-func (w *Watcher) getEventCh(dockerWatcher watcher.DockerWatcher) (eventCh <-chan events.Event, errCh <-chan E.Error) {
+func (w *Watcher) getEventCh(dockerWatcher watcher.DockerWatcher) (eventCh <-chan events.Event, errCh <-chan gperr.Error) {
 	eventCh, errCh = dockerWatcher.EventsWithOptions(w.Task().Context(), watcher.DockerListOptions{
 		Filters: watcher.NewDockerFilter(
 			watcher.DockerFilterContainer,
@@ -251,7 +251,7 @@ func (w *Watcher) watchUntilDestroy() (returnCause error) {
 			return w.task.FinishCause()
 		case err := <-dockerEventErrCh:
 			if !err.Is(context.Canceled) {
-				E.LogError("idlewatcher error", err, &w.Logger)
+				gperr.LogError("idlewatcher error", err, &w.Logger)
 			}
 			return err
 		case e := <-dockerEventCh:

internal/docker/label.go

@@ -1,17 +1,17 @@
 package docker
 
 import (
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/utils/strutils"
 )
 
 type LabelMap = map[string]any
 
-var ErrInvalidLabel = E.New("invalid label")
+var ErrInvalidLabel = gperr.New("invalid label")
 
-func ParseLabels(labels map[string]string) (LabelMap, E.Error) {
+func ParseLabels(labels map[string]string) (LabelMap, gperr.Error) {
 	nestedMap := make(LabelMap)
-	errs := E.NewBuilder("labels error")
+	errs := gperr.NewBuilder("labels error")
 
 	for lbl, value := range labels {
 		parts := strutils.SplitRune(lbl, '.')
@@ -37,7 +37,7 @@ func ParseLabels(labels map[string]string) (LabelMap, E.Error) {
 				// Move deeper into the nested map
 				m, ok := currentMap[k].(LabelMap)
 				if !ok && currentMap[k] != "" {
-					errs.Add(E.Errorf("expect mapping, got %T", currentMap[k]).Subject(lbl))
+					errs.Add(gperr.Errorf("expect mapping, got %T", currentMap[k]).Subject(lbl))
 					continue
 				} else if !ok {
 					m = make(LabelMap)

internal/entrypoint/entrypoint.go

@@ -7,10 +7,10 @@ import (
 	"strings"
 
 	"github.com/yusing/go-proxy/internal/logging"
-	gphttp "github.com/yusing/go-proxy/internal/net/http"
+	gphttp "github.com/yusing/go-proxy/internal/net/gphttp"
-	"github.com/yusing/go-proxy/internal/net/http/accesslog"
+	"github.com/yusing/go-proxy/internal/net/gphttp/accesslog"
-	"github.com/yusing/go-proxy/internal/net/http/middleware"
+	"github.com/yusing/go-proxy/internal/net/gphttp/middleware"
-	"github.com/yusing/go-proxy/internal/net/http/middleware/errorpage"
+	"github.com/yusing/go-proxy/internal/net/gphttp/middleware/errorpage"
 	"github.com/yusing/go-proxy/internal/route/routes"
 	route "github.com/yusing/go-proxy/internal/route/types"
 	"github.com/yusing/go-proxy/internal/task"

internal/gperr/README.md

@@ -0,0 +1,106 @@
+# gperr
+
+gperr is an error interface that supports nested structure and subject highlighting.
+
+## Usage
+
+### gperr.Error
+
+The error interface.
+
+### gperr.New
+
+Like `errors.New`, but returns a `gperr.Error`.
+
+### gperr.Wrap
+
+Like `fmt.Errorf("%s: %w", message, err)`, but returns a `gperr.Error`.
+
+### gperr.Error.Subject
+
+Returns a new error with the subject prepended to the error message. The main subject is highlighted.
+
+```go
+err := gperr.New("error message")
+err = err.Subject("bar")
+err = err.Subject("foo")
+```
+
+Output:
+
+<code>foo > <span style="color: red;">bar</span>: error message</code>
+
+### gperr.Error.Subjectf
+
+Like `gperr.Error.Subject`, but formats the subject with `fmt.Sprintf`.
+
+### gperr.PrependSubject
+
+Prepends the subject to the error message like `gperr.Error.Subject`.
+
+```go
+err := gperr.New("error message")
+err = gperr.PrependSubject(err, "foo")
+err = gperr.PrependSubject(err, "bar")
+```
+
+Output:
+
+<code>bar > <span style="color: red;">foo</span>: error message</code>
+
+### gperr.Error.With
+
+Adds a new error to the error chain.
+
+```go
+err := gperr.New("error message")
+err = err.With(gperr.New("inner error"))
+err = err.With(gperr.New("inner error 2").With(gperr.New("inner inner error")))
+```
+
+Output:
+
+```
+error message:
+  • inner error
+  • inner error 2
+    • inner inner error
+```
+
+### gperr.Error.Withf
+
+Like `gperr.Error.With`, but formats the error with `fmt.Errorf`.
+
+### gperr.Error.Is
+
+Returns true if the error is equal to the given error.
+
+### gperr.Builder
+
+A builder for `gperr.Error`.
+
+```go
+builder := gperr.NewBuilder("foo")
+builder.Add(gperr.New("error message"))
+builder.Addf("error message: %s", "foo")
+builder.AddRange(gperr.New("error message 1"), gperr.New("error message 2"))
+```
+
+Output:
+
+```
+foo:
+  • error message
+  • error message: foo
+  • error message 1
+  • error message 2
+```
+
+### gperr.Builder.Build
+
+Builds a `gperr.Error` from the builder.
+
+## When to return gperr.Error
+
+- When you want to return multiple errors
+- When the error has a subject

internal/gperr/base.go

@@ -1,4 +1,4 @@
-package err
+package gperr
 
 import (
 	"encoding/json"

internal/gperr/builder.go

@@ -1,4 +1,4 @@
-package err
+package gperr
 
 import (
 	"fmt"
@@ -36,7 +36,7 @@ func (b *Builder) error() Error {
 
 func (b *Builder) Error() Error {
 	if len(b.errs) == 1 {
-		return From(b.errs[0])
+		return wrap(b.errs[0])
 	}
 	return b.error()
 }
@@ -60,7 +60,7 @@ func (b *Builder) Add(err error) *Builder {
 	b.Lock()
 	defer b.Unlock()
 
-	switch err := From(err).(type) {
+	switch err := wrap(err).(type) {
 	case *baseError:
 		b.errs = append(b.errs, err.Err)
 	case *nestedError:

internal/gperr/builder_test.go

@@ -1,4 +1,4 @@
-package err_test
+package gperr_test
 
 import (
 	"context"
@@ -6,7 +6,7 @@ import (
 	"io"
 	"testing"
 
-	. "github.com/yusing/go-proxy/internal/error"
+	. "github.com/yusing/go-proxy/internal/gperr"
 	. "github.com/yusing/go-proxy/internal/utils/testing"
 )
 

internal/gperr/error.go

@@ -1,4 +1,4 @@
-package err
+package gperr
 
 type Error interface {
 	error

internal/gperr/error_test.go

@@ -1,4 +1,4 @@
-package err
+package gperr
 
 import (
 	"errors"
@@ -44,7 +44,7 @@ func TestBaseWithExtra(t *testing.T) {
 
 func TestBaseUnwrap(t *testing.T) {
 	err := errors.New("err")
-	wrapped := From(err)
+	wrapped := Wrap(err)
 
 	ExpectError(t, err, errors.Unwrap(wrapped))
 }
@@ -52,7 +52,7 @@ func TestBaseUnwrap(t *testing.T) {
 func TestNestedUnwrap(t *testing.T) {
 	err := errors.New("err")
 	err2 := New("err2")
-	wrapped := From(err).Subject("foo").With(err2.Subject("bar"))
+	wrapped := Wrap(err).Subject("foo").With(err2.Subject("bar"))
 
 	unwrapper, ok := wrapped.(interface{ Unwrap() []error })
 	ExpectTrue(t, ok)
@@ -64,7 +64,7 @@ func TestNestedUnwrap(t *testing.T) {
 
 func TestErrorIs(t *testing.T) {
 	from := errors.New("error")
-	err := From(from)
+	err := Wrap(from)
 	ExpectError(t, from, err)
 
 	ExpectTrue(t, err.Is(from))

internal/gperr/log.go

@@ -1,4 +1,4 @@
-package err
+package gperr
 
 import (
 	"github.com/rs/zerolog"
@@ -6,42 +6,35 @@ import (
 	"github.com/yusing/go-proxy/internal/logging"
 )
 
-func getLogger(logger ...*zerolog.Logger) *zerolog.Logger {
+func log(msg string, err error, level zerolog.Level, logger ...*zerolog.Logger) {
+	var l *zerolog.Logger
 	if len(logger) > 0 {
-		return logger[0]
+		l = logger[0]
+	} else {
+		l = logging.GetLogger()
 	}
-	return logging.GetLogger()
+	l.WithLevel(level).Msg(msg + ": " + err.Error())
 }
 
-//go:inline
 func LogFatal(msg string, err error, logger ...*zerolog.Logger) {
 	if common.IsDebug {
 		LogPanic(msg, err, logger...)
 	}
-	getLogger(logger...).Fatal().Msg(err.Error())
+	log(msg, err, zerolog.FatalLevel, logger...)
 }
 
-//go:inline
 func LogError(msg string, err error, logger ...*zerolog.Logger) {
-	getLogger(logger...).Error().Msg(err.Error())
+	log(msg, err, zerolog.ErrorLevel, logger...)
 }
 
-//go:inline
 func LogWarn(msg string, err error, logger ...*zerolog.Logger) {
-	getLogger(logger...).Warn().Msg(err.Error())
+	log(msg, err, zerolog.WarnLevel, logger...)
 }
 
-//go:inline
 func LogPanic(msg string, err error, logger ...*zerolog.Logger) {
-	getLogger(logger...).Panic().Msg(err.Error())
+	log(msg, err, zerolog.PanicLevel, logger...)
 }
 
-//go:inline
-func LogInfo(msg string, err error, logger ...*zerolog.Logger) {
-	getLogger(logger...).Info().Msg(err.Error())
-}
-
-//go:inline
 func LogDebug(msg string, err error, logger ...*zerolog.Logger) {
-	getLogger(logger...).Debug().Msg(err.Error())
+	log(msg, err, zerolog.DebugLevel, logger...)
 }

internal/gperr/nested_error.go

@@ -1,4 +1,4 @@
-package err
+package gperr
 
 import (
 	"errors"
@@ -99,7 +99,7 @@ func makeLines(errs []error, level int) []string {
 	}
 	lines := make([]string, 0, len(errs))
 	for _, err := range errs {
-		switch err := From(err).(type) {
+		switch err := wrap(err).(type) {
 		case *nestedError:
 			if err.Err != nil {
 				lines = append(lines, makeLine(err.Err.Error(), level))

internal/gperr/subject.go

@@ -1,4 +1,4 @@
-package err
+package gperr
 
 import (
 	"encoding/json"

internal/gperr/utils.go

@@ -1,6 +1,8 @@
-package err
+package gperr
 
 import (
+	"encoding/json"
+	"errors"
 	"fmt"
 )
 
@@ -19,27 +21,50 @@ func Errorf(format string, args ...any) Error {
 	return &baseError{fmt.Errorf(format, args...)}
 }
 
+// Wrap wraps message in front of the error message.
 func Wrap(err error, message ...string) Error {
-	if len(message) == 0 || message[0] == "" {
+	if err == nil {
-		return From(err)
+		return nil
 	}
-	return Errorf("%s: %w", message[0], err)
+	if len(message) == 0 || message[0] == "" {
+		return wrap(err)
+	}
+	//nolint:errorlint
+	switch err := err.(type) {
+	case *baseError:
+		err.Err = fmt.Errorf("%s: %w", message[0], err.Err)
+		return err
+	case *nestedError:
+		err.Err = fmt.Errorf("%s: %w", message[0], err.Err)
+		return err
+	}
+	return &baseError{fmt.Errorf("%s: %w", message[0], err)}
 }
 
-func From(err error) Error {
+func wrap(err error) Error {
 	if err == nil {
 		return nil
 	}
 	//nolint:errorlint
 	switch err := err.(type) {
-	case *baseError:
+	case Error:
-		return err
-	case *nestedError:
 		return err
 	}
 	return &baseError{err}
 }
 
+func IsJSONMarshallable(err error) bool {
+	switch err := err.(type) {
+	case *nestedError, *withSubject:
+		return true
+	case *baseError:
+		return IsJSONMarshallable(err.Err)
+	default:
+		var v json.Marshaler
+		return errors.As(err, &v)
+	}
+}
+
 func Join(errors ...error) Error {
 	n := 0
 	for _, err := range errors {

internal/gperr/utils_test.go

@@ -0,0 +1,58 @@
+package gperr
+
+import (
+	"errors"
+	"testing"
+)
+
+type testErr struct{}
+
+func (e *testErr) Error() string {
+	return "test error"
+}
+
+func (e *testErr) MarshalJSON() ([]byte, error) {
+	return nil, nil
+}
+
+func TestIsJSONMarshallable(t *testing.T) {
+	tests := []struct {
+		name string
+		err  error
+		want bool
+	}{
+		{
+			name: "testErr",
+			err:  &testErr{},
+			want: true,
+		},
+		{
+			name: "baseError",
+			err:  &baseError{},
+			want: true,
+		},
+		{
+			name: "nestedError",
+			err:  &nestedError{},
+			want: true,
+		},
+		{
+			name: "withSubject",
+			err:  &withSubject{},
+			want: true,
+		},
+		{
+			name: "standard error",
+			err:  errors.New("test error"),
+			want: false,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			if got := IsJSONMarshallable(test.err); got != test.want {
+				t.Errorf("IsJSONMarshallable(%v) = %v, want %v", test.err, got, test.want)
+			}
+		})
+	}
+}

internal/homepage/icon_url.go

@@ -5,7 +5,7 @@ import (
 	"strings"
 
 	"github.com/yusing/go-proxy/internal"
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 )
 
 type (
@@ -31,7 +31,7 @@ const (
 	IconSourceSelfhSt
 )
 
-var ErrInvalidIconURL = E.New("invalid icon url")
+var ErrInvalidIconURL = gperr.New("invalid icon url")
 
 func NewSelfhStIconURL(reference, format string) *IconURL {
 	return &IconURL{

internal/logging/memlogger/mem_logger.go

@@ -11,9 +11,10 @@ import (
 
 	"github.com/coder/websocket"
 	"github.com/rs/zerolog"
-	"github.com/yusing/go-proxy/internal/api/v1/utils"
 	"github.com/yusing/go-proxy/internal/common"
 	"github.com/yusing/go-proxy/internal/logging"
+	"github.com/yusing/go-proxy/internal/net/gphttp"
+	"github.com/yusing/go-proxy/internal/net/gphttp/gpwebsocket"
 	"github.com/yusing/go-proxy/internal/task"
 	F "github.com/yusing/go-proxy/internal/utils/functional"
 )
@@ -27,8 +28,9 @@ type memLogger struct {
 	sync.RWMutex
 	notifyLock sync.RWMutex
 	connChans  F.Map[chan *logEntryRange, struct{}]
+	listeners  F.Map[chan []byte, struct{}]
 
-	bufPool sync.Pool // used in hook mode
+	bufPool sync.Pool
 }
 
 type MemLogger io.Writer
@@ -41,15 +43,16 @@ const (
 	maxMemLogSize         = 16 * 1024
 	truncateSize          = maxMemLogSize / 2
 	initialWriteChunkSize = 4 * 1024
-	hookModeBufSize       = 256
+	bufPoolSize           = 256
 )
 
 var memLoggerInstance = &memLogger{
 	connChans: F.NewMapOf[chan *logEntryRange, struct{}](),
+	listeners: F.NewMapOf[chan []byte, struct{}](),
 	bufPool: sync.Pool{
 		New: func() any {
 			return &buffer{
-				data: make([]byte, 0, hookModeBufSize),
+				data: make([]byte, 0, bufPoolSize),
 			}
 		},
 	},
@@ -92,6 +95,10 @@ func HandlerFunc() http.HandlerFunc {
 	return memLoggerInstance.ServeHTTP
 }
 
+func Events() (<-chan []byte, func()) {
+	return memLoggerInstance.events()
+}
+
 func (m *memLogger) truncateIfNeeded(n int) {
 	m.RLock()
 	needTruncate := m.Len()+n > maxMemLogSize
@@ -111,7 +118,7 @@ func (m *memLogger) truncateIfNeeded(n int) {
 
 func (m *memLogger) notifyWS(pos, n int) {
 	if m.connChans.Size() > 0 {
-		timeout := time.NewTimer(1 * time.Second)
+		timeout := time.NewTimer(2 * time.Second)
 		defer timeout.Stop()
 
 		m.notifyLock.RLock()
@@ -125,6 +132,19 @@ func (m *memLogger) notifyWS(pos, n int) {
 				return false
 			}
 		})
+		if m.listeners.Size() > 0 {
+			msg := make([]byte, n)
+			copy(msg, m.Buffer.Bytes()[pos:pos+n])
+			m.listeners.Range(func(ch chan []byte, _ struct{}) bool {
+				select {
+				case <-timeout.C:
+					logging.Warn().Msg("mem logger: timeout logging to channel")
+					return false
+				case ch <- msg:
+					return true
+				}
+			})
+		}
 		return
 	}
 }
@@ -153,9 +173,9 @@ func (m *memLogger) Write(p []byte) (n int, err error) {
 }
 
 func (m *memLogger) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	conn, err := utils.InitiateWS(w, r)
+	conn, err := gpwebsocket.Initiate(w, r)
 	if err != nil {
-		utils.HandleErr(w, r, err)
+		gphttp.ServerError(w, r, err)
 		return
 	}
 
@@ -172,13 +192,27 @@ func (m *memLogger) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	}()
 
 	if err := m.wsInitial(r.Context(), conn); err != nil {
-		utils.HandleErr(w, r, err)
+		gphttp.ServerError(w, r, err)
 		return
 	}
 
 	m.wsStreamLog(r.Context(), conn, logCh)
 }
 
+func (m *memLogger) events() (<-chan []byte, func()) {
+	ch := make(chan []byte, 10)
+	m.notifyLock.Lock()
+	defer m.notifyLock.Unlock()
+	m.listeners.Store(ch, struct{}{})
+
+	return ch, func() {
+		m.notifyLock.Lock()
+		defer m.notifyLock.Unlock()
+		m.listeners.Delete(ch)
+		close(ch)
+	}
+}
+
 func (m *memLogger) writeBytes(ctx context.Context, conn *websocket.Conn, b []byte) error {
 	return conn.Write(ctx, websocket.MessageText, b)
 }

internal/metrics/period/handler.go

@@ -7,9 +7,10 @@ import (
 
 	"github.com/coder/websocket"
 	"github.com/coder/websocket/wsjson"
-	"github.com/yusing/go-proxy/internal/api/v1/utils"
 	metricsutils "github.com/yusing/go-proxy/internal/metrics/utils"
-	"github.com/yusing/go-proxy/internal/net/http/httpheaders"
+	"github.com/yusing/go-proxy/internal/net/gphttp"
+	"github.com/yusing/go-proxy/internal/net/gphttp/gpwebsocket"
+	"github.com/yusing/go-proxy/internal/net/gphttp/httpheaders"
 )
 
 // ServeHTTP serves the data for the given period.
@@ -36,7 +37,7 @@ func (p *Poller[T, AggregateT]) ServeHTTP(w http.ResponseWriter, r *http.Request
 		if interval < minInterval {
 			interval = minInterval
 		}
-		utils.PeriodicWS(w, r, interval, func(conn *websocket.Conn) error {
+		gpwebsocket.Periodic(w, r, interval, func(conn *websocket.Conn) error {
 			data, err := p.getRespData(r)
 			if err != nil {
 				return err
@@ -49,14 +50,14 @@ func (p *Poller[T, AggregateT]) ServeHTTP(w http.ResponseWriter, r *http.Request
 	} else {
 		data, err := p.getRespData(r)
 		if err != nil {
-			utils.HandleErr(w, r, err)
+			gphttp.ServerError(w, r, err)
 			return
 		}
 		if data == nil {
 			http.Error(w, "no data", http.StatusNoContent)
 			return
 		}
-		utils.RespondJSON(w, r, data)
+		gphttp.RespondJSON(w, r, data)
 	}
 }
 

internal/metrics/period/poller.go

@@ -6,7 +6,7 @@ import (
 	"net/url"
 	"time"
 
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/logging"
 	"github.com/yusing/go-proxy/internal/task"
 )
@@ -84,7 +84,7 @@ func (p *Poller[T, AggregateT]) gatherErrs() (string, bool) {
 	if len(p.errs) == 0 {
 		return "", false
 	}
-	errs := E.NewBuilder(fmt.Sprintf("poller %s has encountered %d errors in the last %s:", p.name, len(p.errs), gatherErrsInterval))
+	errs := gperr.NewBuilder(fmt.Sprintf("poller %s has encountered %d errors in the last %s:", p.name, len(p.errs), gatherErrsInterval))
 	for _, e := range p.errs {
 		errs.Addf("%w: %d times", e.err, e.count)
 	}

internal/metrics/systeminfo/system_info.go

@@ -12,7 +12,7 @@ import (
 	"github.com/shirou/gopsutil/v4/net"
 	"github.com/shirou/gopsutil/v4/sensors"
 	"github.com/yusing/go-proxy/internal/common"
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/logging"
 	"github.com/yusing/go-proxy/internal/metrics/period"
 	"github.com/yusing/go-proxy/internal/utils/strutils"
@@ -40,7 +40,7 @@ func _() { // check if this behavior is not changed
 }
 
 func getSystemInfo(ctx context.Context, lastResult *SystemInfo) (*SystemInfo, error) {
-	errs := E.NewBuilder("failed to get system info")
+	errs := gperr.NewBuilder("failed to get system info")
 	var systemInfo SystemInfo
 
 	if !common.MetricsDisableCPU {
@@ -95,8 +95,8 @@ func getSystemInfo(ctx context.Context, lastResult *SystemInfo) (*SystemInfo, er
 	}
 
 	if errs.HasError() {
-		allWarnings := E.NewBuilder("")
+		allWarnings := gperr.NewBuilder("")
-		allErrors := E.NewBuilder("failed to get system info")
+		allErrors := gperr.NewBuilder("failed to get system info")
 		errs.ForEach(func(err error) {
 			// disk.Warnings has the same type
 			// all Warnings are alias of common.Warnings from "github.com/shirou/gopsutil/v4/internal/common"

internal/net/gphttp/accesslog/access_logger.go

@@ -7,7 +7,7 @@ import (
 	"sync"
 	"time"
 
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/logging"
 	"github.com/yusing/go-proxy/internal/task"
 )
@@ -131,7 +131,7 @@ func (l *AccessLogger) Flush(force bool) {
 }
 
 func (l *AccessLogger) handleErr(err error) {
-	E.LogError("failed to write access log", err)
+	gperr.LogError("failed to write access log", err)
 }
 
 func (l *AccessLogger) start() {

internal/net/gphttp/accesslog/access_logger_test.go

@@ -9,7 +9,7 @@ import (
 	"testing"
 	"time"
 
-	. "github.com/yusing/go-proxy/internal/net/http/accesslog"
+	. "github.com/yusing/go-proxy/internal/net/gphttp/accesslog"
 	"github.com/yusing/go-proxy/internal/task"
 	. "github.com/yusing/go-proxy/internal/utils/testing"
 )

internal/net/gphttp/accesslog/config_test.go

@@ -4,7 +4,7 @@ import (
 	"testing"
 
 	"github.com/yusing/go-proxy/internal/docker"
-	. "github.com/yusing/go-proxy/internal/net/http/accesslog"
+	. "github.com/yusing/go-proxy/internal/net/gphttp/accesslog"
 	"github.com/yusing/go-proxy/internal/utils"
 	. "github.com/yusing/go-proxy/internal/utils/testing"
 )

internal/net/gphttp/accesslog/fields_test.go

@@ -3,7 +3,7 @@ package accesslog_test
 import (
 	"testing"
 
-	. "github.com/yusing/go-proxy/internal/net/http/accesslog"
+	. "github.com/yusing/go-proxy/internal/net/gphttp/accesslog"
 	. "github.com/yusing/go-proxy/internal/utils/testing"
 )
 

internal/net/gphttp/accesslog/filter.go

@@ -5,7 +5,7 @@ import (
 	"net/http"
 	"strings"
 
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/net/types"
 	"github.com/yusing/go-proxy/internal/utils/strutils"
 )
@@ -27,7 +27,7 @@ type (
 	CIDR struct{ types.CIDR }
 )
 
-var ErrInvalidHTTPHeaderFilter = E.New("invalid http header filter")
+var ErrInvalidHTTPHeaderFilter = gperr.New("invalid http header filter")
 
 func (f *LogFilter[T]) CheckKeep(req *http.Request, res *http.Response) bool {
 	if len(f.Values) == 0 {

internal/net/gphttp/accesslog/filter_test.go

@@ -4,7 +4,7 @@ import (
 	"net/http"
 	"testing"
 
-	. "github.com/yusing/go-proxy/internal/net/http/accesslog"
+	. "github.com/yusing/go-proxy/internal/net/gphttp/accesslog"
 	"github.com/yusing/go-proxy/internal/utils/strutils"
 	. "github.com/yusing/go-proxy/internal/utils/testing"
 )

internal/net/gphttp/accesslog/retention.go

@@ -7,7 +7,7 @@ import (
 	"strconv"
 	"time"
 
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/utils/strutils"
 )
 
@@ -19,8 +19,8 @@ type Retention struct {
 const chunkSizeMax int64 = 128 * 1024 // 128KB
 
 var (
-	ErrInvalidSyntax = E.New("invalid syntax")
+	ErrInvalidSyntax = gperr.New("invalid syntax")
-	ErrZeroValue     = E.New("zero value")
+	ErrZeroValue     = gperr.New("zero value")
 )
 
 // Syntax:

internal/net/gphttp/accesslog/retention_test.go

@@ -4,7 +4,7 @@ import (
 	"testing"
 	"time"
 
-	. "github.com/yusing/go-proxy/internal/net/http/accesslog"
+	. "github.com/yusing/go-proxy/internal/net/gphttp/accesslog"
 	"github.com/yusing/go-proxy/internal/task"
 	"github.com/yusing/go-proxy/internal/utils/strutils"
 	. "github.com/yusing/go-proxy/internal/utils/testing"

internal/net/gphttp/accesslog/status_code_range.go

@@ -3,7 +3,7 @@ package accesslog
 import (
 	"strconv"
 
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/utils/strutils"
 )
 
@@ -12,7 +12,7 @@ type StatusCodeRange struct {
 	End   int
 }
 
-var ErrInvalidStatusCodeRange = E.New("invalid status code range")
+var ErrInvalidStatusCodeRange = gperr.New("invalid status code range")
 
 func (r *StatusCodeRange) Includes(code int) bool {
 	return r.Start <= code && code <= r.End
@@ -25,7 +25,7 @@ func (r *StatusCodeRange) Parse(v string) error {
 	case 1:
 		start, err := strconv.Atoi(split[0])
 		if err != nil {
-			return E.From(err)
+			return gperr.Wrap(err)
 		}
 		r.Start = start
 		r.End = start
@@ -33,7 +33,7 @@ func (r *StatusCodeRange) Parse(v string) error {
 	case 2:
 		start, errStart := strconv.Atoi(split[0])
 		end, errEnd := strconv.Atoi(split[1])
-		if err := E.Join(errStart, errEnd); err != nil {
+		if err := gperr.Join(errStart, errEnd); err != nil {
 			return err
 		}
 		r.Start = start

internal/net/gphttp/body.go

@@ -1,7 +1,9 @@
-package utils
+package gphttp
 
 import (
+	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"net/http"
 
@@ -10,7 +12,13 @@ import (
 
 func WriteBody(w http.ResponseWriter, body []byte) {
 	if _, err := w.Write(body); err != nil {
-		logging.Err(err).Msg("failed to write body")
+		switch {
+		case errors.Is(err, http.ErrHandlerTimeout),
+			errors.Is(err, context.DeadlineExceeded):
+			logging.Err(err).Msg("timeout writing body")
+		default:
+			logging.Err(err).Msg("failed to write body")
+		}
 	}
 }
 
@@ -25,13 +33,13 @@ func RespondJSON(w http.ResponseWriter, r *http.Request, data any, code ...int)
 	case string:
 		_, err = w.Write([]byte(fmt.Sprintf("%q", data)))
 	case []byte:
-		_, err = w.Write(data)
+		panic("use WriteBody instead")
 	default:
 		err = json.NewEncoder(w).Encode(data)
 	}
 
 	if err != nil {
-		HandleErr(w, r, err)
+		LogError(r).Err(err).Msg("failed to encode json")
 		return false
 	}
 	return true

internal/net/gphttp/content_type.go

@@ -1,4 +1,4 @@
-package http
+package gphttp
 
 import (
 	"mime"

internal/net/gphttp/content_type_test.go

@@ -1,4 +1,4 @@
-package http
+package gphttp
 
 import (
 	"net/http"

internal/net/gphttp/default_client.go

@@ -1,22 +1,21 @@
-package utils
+package gphttp
 
 import (
 	"crypto/tls"
 	"net"
 	"net/http"
-
+	"time"
-	"github.com/yusing/go-proxy/internal/common"
 )
 
 var (
 	httpClient = &http.Client{
-		Timeout: common.ConnectionTimeout,
+		Timeout: 5 * time.Second,
 		Transport: &http.Transport{
 			DisableKeepAlives: true,
 			ForceAttemptHTTP2: false,
 			DialContext: (&net.Dialer{
-				Timeout:   common.DialTimeout,
+				Timeout:   3 * time.Second,
-				KeepAlive: common.KeepAlive, // this is different from DisableKeepAlives
+				KeepAlive: 60 * time.Second, // this is different from DisableKeepAlives
 			}).DialContext,
 			TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
 		},

internal/net/gphttp/error.go

@@ -0,0 +1,95 @@
+package gphttp
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"syscall"
+
+	"github.com/yusing/go-proxy/internal/gperr"
+	"github.com/yusing/go-proxy/internal/net/gphttp/httpheaders"
+)
+
+// ServerError is for handling server errors.
+//
+// It logs the error and returns http.StatusInternalServerError to the client.
+// Status code can be specified as an argument.
+func ServerError(w http.ResponseWriter, r *http.Request, err error, code ...int) {
+	switch {
+	case err == nil,
+		errors.Is(err, context.Canceled),
+		errors.Is(err, syscall.EPIPE),
+		errors.Is(err, syscall.ECONNRESET):
+		return
+	}
+	LogError(r).Msg(err.Error())
+	if httpheaders.IsWebsocket(r.Header) {
+		return
+	}
+	if len(code) == 0 {
+		code = []int{http.StatusInternalServerError}
+	}
+	http.Error(w, http.StatusText(code[0]), code[0])
+}
+
+// ClientError is for responding to client errors.
+//
+// It returns http.StatusBadRequest with reason to the client.
+// Status code can be specified as an argument.
+//
+// For JSON marshallable errors (e.g. gperr.Error), it returns the error details as JSON.
+// Otherwise, it returns the error details as plain text.
+func ClientError(w http.ResponseWriter, err error, code ...int) {
+	if len(code) == 0 {
+		code = []int{http.StatusBadRequest}
+	}
+	if gperr.IsJSONMarshallable(err) {
+		w.Header().Set("Content-Type", "application/json")
+		json.NewEncoder(w).Encode(err)
+	} else {
+		w.Header().Set("Content-Type", "text/plain; charset=utf-8")
+	}
+	http.Error(w, err.Error(), code[0])
+}
+
+// JSONError returns a JSON response of gperr.Error with the given status code.
+func JSONError(w http.ResponseWriter, err gperr.Error, code int) {
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(err)
+	http.Error(w, err.Error(), code)
+}
+
+// BadRequest returns a Bad Request response with the given error message.
+func BadRequest(w http.ResponseWriter, err string, code ...int) {
+	if len(code) == 0 {
+		code = []int{http.StatusBadRequest}
+	}
+	http.Error(w, err, code[0])
+}
+
+// Unauthorized returns an Unauthorized response with the given error message.
+func Unauthorized(w http.ResponseWriter, err string) {
+	BadRequest(w, err, http.StatusUnauthorized)
+}
+
+// NotFound returns a Not Found response with the given error message.
+func NotFound(w http.ResponseWriter, err string) {
+	BadRequest(w, err, http.StatusNotFound)
+}
+
+func ErrMissingKey(k string) error {
+	return gperr.New(k + " is required")
+}
+
+func ErrInvalidKey(k string) error {
+	return gperr.New(k + " is invalid")
+}
+
+func ErrAlreadyExists(k, v string) error {
+	return gperr.Errorf("%s %q already exists", k, v)
+}
+
+func ErrNotFound(k, v string) error {
+	return gperr.Errorf("%s %q not found", k, v)
+}

internal/net/gphttp/gpwebsocket/utils.go

@@ -1,4 +1,4 @@
-package utils
+package gpwebsocket
 
 import (
 	"net/http"
@@ -7,8 +7,10 @@ import (
 
 	"github.com/coder/websocket"
 	"github.com/yusing/go-proxy/internal/common"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/logging"
-	"github.com/yusing/go-proxy/internal/net/http/httpheaders"
+	"github.com/yusing/go-proxy/internal/net/gphttp"
+	"github.com/yusing/go-proxy/internal/net/gphttp/httpheaders"
 )
 
 func warnNoMatchDomains() {
@@ -17,7 +19,7 @@ func warnNoMatchDomains() {
 
 var warnNoMatchDomainOnce sync.Once
 
-func InitiateWS(w http.ResponseWriter, r *http.Request) (*websocket.Conn, error) {
+func Initiate(w http.ResponseWriter, r *http.Request) (*websocket.Conn, error) {
 	var originPats []string
 
 	localAddresses := []string{"127.0.0.1", "10.0.*.*", "172.16.*.*", "192.168.*.*"}
@@ -42,17 +44,17 @@ func InitiateWS(w http.ResponseWriter, r *http.Request) (*websocket.Conn, error)
 	})
 }
 
-func PeriodicWS(w http.ResponseWriter, r *http.Request, interval time.Duration, do func(conn *websocket.Conn) error) {
+func Periodic(w http.ResponseWriter, r *http.Request, interval time.Duration, do func(conn *websocket.Conn) error) {
-	conn, err := InitiateWS(w, r)
+	conn, err := Initiate(w, r)
 	if err != nil {
-		HandleErr(w, r, err)
+		gphttp.ServerError(w, r, err)
 		return
 	}
 	//nolint:errcheck
 	defer conn.CloseNow()
 
 	if err := do(conn); err != nil {
-		HandleErr(w, r, err)
+		gphttp.ServerError(w, r, err)
 		return
 	}
 
@@ -65,9 +67,20 @@ func PeriodicWS(w http.ResponseWriter, r *http.Request, interval time.Duration,
 			return
 		case <-ticker.C:
 			if err := do(conn); err != nil {
-				HandleErr(w, r, err)
+				gphttp.ServerError(w, r, err)
 				return
 			}
 		}
 	}
 }
+
+// WriteText writes a text message to the websocket connection.
+// It returns true if the message was written successfully, false otherwise.
+// It logs an error if the message is not written successfully.
+func WriteText(r *http.Request, conn *websocket.Conn, msg string) bool {
+	if err := conn.Write(r.Context(), websocket.MessageText, []byte(msg)); err != nil {
+		gperr.LogError("failed to write text message", err)
+		return false
+	}
+	return true
+}

internal/net/gphttp/httpheaders/utils.go

@@ -17,13 +17,15 @@ const (
 	HeaderXForwardedURI    = "X-Forwarded-Uri"
 	HeaderXRealIP          = "X-Real-IP"
 
-	HeaderUpstreamName   = "X-GoDoxy-Upstream-Name"
-	HeaderUpstreamScheme = "X-GoDoxy-Upstream-Scheme"
-	HeaderUpstreamHost   = "X-GoDoxy-Upstream-Host"
-	HeaderUpstreamPort   = "X-GoDoxy-Upstream-Port"
-
 	HeaderContentType   = "Content-Type"
 	HeaderContentLength = "Content-Length"
+
+	HeaderUpstreamName   = "X-Godoxy-Upstream-Name"
+	HeaderUpstreamScheme = "X-Godoxy-Upstream-Scheme"
+	HeaderUpstreamHost   = "X-Godoxy-Upstream-Host"
+	HeaderUpstreamPort   = "X-Godoxy-Upstream-Port"
+
+	HeaderGoDoxyCheckRedirect = "X-Godoxy-Check-Redirect"
 )
 
 // Hop-by-hop headers. These are removed when sent to the backend.

internal/net/gphttp/loadbalancer/ip_hash.go

@@ -6,8 +6,8 @@ import (
 	"net/http"
 	"sync"
 
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
-	"github.com/yusing/go-proxy/internal/net/http/middleware"
+	"github.com/yusing/go-proxy/internal/net/gphttp/middleware"
 )
 
 type ipHash struct {
@@ -23,10 +23,10 @@ func (lb *LoadBalancer) newIPHash() impl {
 	if len(lb.Options) == 0 {
 		return impl
 	}
-	var err E.Error
+	var err gperr.Error
 	impl.realIP, err = middleware.RealIP.New(lb.Options)
 	if err != nil {
-		E.LogError("invalid real_ip options, ignoring", err, &impl.l)
+		gperr.LogError("invalid real_ip options, ignoring", err, &impl.l)
 	}
 	return impl
 }

internal/net/gphttp/loadbalancer/loadbalancer.go

@@ -6,10 +6,10 @@ import (
 	"time"
 
 	"github.com/rs/zerolog"
-	"github.com/yusing/go-proxy/internal/common"
+	"github.com/yusing/go-proxy/internal/gperr"
-	E "github.com/yusing/go-proxy/internal/error"
 	"github.com/yusing/go-proxy/internal/logging"
-	"github.com/yusing/go-proxy/internal/net/http/loadbalancer/types"
+	"github.com/yusing/go-proxy/internal/net/gphttp/httpheaders"
+	"github.com/yusing/go-proxy/internal/net/gphttp/loadbalancer/types"
 	"github.com/yusing/go-proxy/internal/route/routes"
 	"github.com/yusing/go-proxy/internal/task"
 	"github.com/yusing/go-proxy/internal/watcher/health"
@@ -54,7 +54,7 @@ func New(cfg *Config) *LoadBalancer {
 }
 
 // Start implements task.TaskStarter.
-func (lb *LoadBalancer) Start(parent task.Parent) E.Error {
+func (lb *LoadBalancer) Start(parent task.Parent) gperr.Error {
 	lb.startTime = time.Now()
 	lb.task = parent.Subtask("loadbalancer."+lb.Link, false)
 	parent.OnCancel("lb_remove_route", func() {
@@ -227,7 +227,7 @@ func (lb *LoadBalancer) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
 		http.Error(rw, "Service unavailable", http.StatusServiceUnavailable)
 		return
 	}
-	if r.Header.Get(common.HeaderCheckRedirect) != "" {
+	if r.Header.Get(httpheaders.HeaderGoDoxyCheckRedirect) != "" {
 		// wake all servers
 		for _, srv := range srvs {
 			if err := srv.TryWake(); err != nil {

internal/net/gphttp/loadbalancer/loadbalancer_test.go

@@ -3,7 +3,7 @@ package loadbalancer
 import (
 	"testing"
 
-	"github.com/yusing/go-proxy/internal/net/http/loadbalancer/types"
+	"github.com/yusing/go-proxy/internal/net/gphttp/loadbalancer/types"
 	. "github.com/yusing/go-proxy/internal/utils/testing"
 )
 

internal/net/gphttp/loadbalancer/types.go

@@ -1,7 +1,7 @@
 package loadbalancer
 
 import (
-	"github.com/yusing/go-proxy/internal/net/http/loadbalancer/types"
+	"github.com/yusing/go-proxy/internal/net/gphttp/loadbalancer/types"
 )
 
 type (

internal/net/gphttp/logging.go

@@ -1,4 +1,4 @@
-package utils
+package gphttp
 
 import (
 	"net/http"

internal/net/gphttp/methods.go

@@ -1,4 +1,4 @@
-package http
+package gphttp
 
 import "net/http"
 

internal/net/gphttp/middleware/cidr_whitelist.go

@@ -5,7 +5,7 @@ import (
 	"net/http"
 
 	"github.com/go-playground/validator/v10"
-	gphttp "github.com/yusing/go-proxy/internal/net/http"
+	gphttp "github.com/yusing/go-proxy/internal/net/gphttp"
 	"github.com/yusing/go-proxy/internal/net/types"
 	"github.com/yusing/go-proxy/internal/utils"
 	F "github.com/yusing/go-proxy/internal/utils/functional"

internal/net/gphttp/middleware/cidr_whitelist_test.go

@@ -7,7 +7,7 @@ import (
 	"strings"
 	"testing"
 
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/utils"
 	. "github.com/yusing/go-proxy/internal/utils/testing"
 )
@@ -61,7 +61,7 @@ func TestCIDRWhitelistValidation(t *testing.T) {
 }
 
 func TestCIDRWhitelist(t *testing.T) {
-	errs := E.NewBuilder("")
+	errs := gperr.NewBuilder("")
 	mids := BuildMiddlewaresFromYAML("", testCIDRWhitelistCompose, errs)
 	ExpectNoError(t, errs.Error())
 	deny = mids["deny@file"]

internal/net/gphttp/middleware/custom_error_page.go

@@ -9,9 +9,9 @@ import (
 	"strings"
 
 	"github.com/yusing/go-proxy/internal/logging"
-	gphttp "github.com/yusing/go-proxy/internal/net/http"
+	gphttp "github.com/yusing/go-proxy/internal/net/gphttp"
-	"github.com/yusing/go-proxy/internal/net/http/httpheaders"
+	"github.com/yusing/go-proxy/internal/net/gphttp/httpheaders"
-	"github.com/yusing/go-proxy/internal/net/http/middleware/errorpage"
+	"github.com/yusing/go-proxy/internal/net/gphttp/middleware/errorpage"
 )
 
 type customErrorPage struct{}

internal/net/gphttp/middleware/errorpage/error_page.go

@@ -7,7 +7,7 @@ import (
 	"sync"
 
 	"github.com/yusing/go-proxy/internal/common"
-	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/logging"
 	"github.com/yusing/go-proxy/internal/task"
 	U "github.com/yusing/go-proxy/internal/utils"
@@ -90,7 +90,7 @@ func watchDir() {
 				loadContent()
 			}
 		case err := <-errCh:
-			E.LogError("error watching error page directory", err)
+			gperr.LogError("error watching error page directory", err)
 		}
 	}
 }