custom error page enabled for default for non-exist routes and invalid host

docs/middlewares.md

@@ -71,8 +71,13 @@ Example:
 Hot-reloading is **supported**, you can **edit**, **rename** or **delete** files **without restarting**. Changes will be reflected after page reload
 
 Error page will be served if:
--   status code is not in range of 200 to 300
+
--   content type is `text/html`, `application/xhtml+xml` or `text/plain`
+- route does not exist or domain does not match any of `match_domains`
+
+or 
+
+- status code is not in range of 200 to 300, and
+- content type is `text/html`, `application/xhtml+xml` or `text/plain`
 
 Error page will be served:
 

internal/common/http.go

@@ -23,3 +23,5 @@ var (
 		return clone
 	}()
 )
+
+const StaticFilePathPrefix = "/$gperrorpage/"

internal/route/http.go

@@ -1,9 +1,7 @@
 package route
 
 import (
-	"encoding/json"
 	"fmt"
-	"slices"
 	"sync"
 
 	"net/http"
@@ -11,6 +9,7 @@ import (
 	"strings"
 
 	"github.com/sirupsen/logrus"
+	"github.com/yusing/go-proxy/internal/api/v1/error_page"
 	"github.com/yusing/go-proxy/internal/common"
 	"github.com/yusing/go-proxy/internal/docker/idlewatcher"
 	E "github.com/yusing/go-proxy/internal/error"
@@ -172,20 +171,18 @@ func (u *URL) MarshalText() (text []byte, err error) {
 func ProxyHandler(w http.ResponseWriter, r *http.Request) {
 	mux, err := findMuxFunc(r.Host)
 	if err != nil {
-		logrus.Error(E.Failure("request").
+		if !middleware.ServeStaticErrorPageFile(w, r) {
-			Subjectf("%s %s", r.Method, r.URL.String()).
+			logrus.Error(E.Failure("request").
-			With(err))
+				Subjectf("%s %s", r.Method, r.URL.String()).
-		acceptTypes := r.Header.Values("Accept")
+				With(err))
-		switch {
+			errorPage, ok := error_page.GetErrorPageByStatus(http.StatusNotFound)
-		case slices.Contains(acceptTypes, "text/html"):
+			if ok {
-
+				w.WriteHeader(http.StatusNotFound)
-		case slices.Contains(acceptTypes, "application/json"):
+				w.Header().Set("Content-Type", "text/html; charset=utf-8")
-			w.WriteHeader(http.StatusNotFound)
+				w.Write(errorPage)
-			json.NewEncoder(w).Encode(map[string]string{
+			} else {
-				"error": err.Error(),
+				http.Error(w, err.Error(), http.StatusNotFound)
-			})
+			}
-		default:
-			http.Error(w, err.Error(), http.StatusNotFound)
 		}
 		return
 	}

internal/route/middleware/custom_error_page.go

@@ -10,40 +10,15 @@ import (
 
 	"github.com/sirupsen/logrus"
 	"github.com/yusing/go-proxy/internal/api/v1/error_page"
+	"github.com/yusing/go-proxy/internal/common"
 	gpHTTP "github.com/yusing/go-proxy/internal/http"
 )
 
-const staticFilePathPrefix = "/$gperrorpage/"
-
 var CustomErrorPage = &Middleware{
 	before: func(next http.Handler, w ResponseWriter, r *Request) {
-		path := r.URL.Path
+		if !ServeStaticErrorPageFile(w, r) {
-		if path != "" && path[0] != '/' {
+			next.ServeHTTP(w, r)
-			path = "/" + path
 		}
-		if strings.HasPrefix(path, staticFilePathPrefix) {
-			filename := path[len(staticFilePathPrefix):]
-			file, ok := error_page.GetStaticFile(filename)
-			if !ok {
-				http.NotFound(w, r)
-				errPageLogger.Errorf("unable to load resource %s", filename)
-			} else {
-				ext := filepath.Ext(filename)
-				switch ext {
-				case ".html":
-					w.Header().Set("Content-Type", "text/html; charset=utf-8")
-				case ".js":
-					w.Header().Set("Content-Type", "application/javascript; charset=utf-8")
-				case ".css":
-					w.Header().Set("Content-Type", "text/css; charset=utf-8")
-				default:
-					errPageLogger.Errorf("unexpected file type %q for %s", ext, filename)
-				}
-				w.Write(file)
-			}
-			return
-		}
-		next.ServeHTTP(w, r)
 	},
 	modifyResponse: func(resp *Response) error {
 		// only handles non-success status code and html/plain content type
@@ -67,4 +42,34 @@ var CustomErrorPage = &Middleware{
 	},
 }
 
+func ServeStaticErrorPageFile(w http.ResponseWriter, r *http.Request) bool {
+	path := r.URL.Path
+	if path != "" && path[0] != '/' {
+		path = "/" + path
+	}
+	if strings.HasPrefix(path, common.StaticFilePathPrefix) {
+		filename := path[len(common.StaticFilePathPrefix):]
+		file, ok := error_page.GetStaticFile(filename)
+		if !ok {
+			errPageLogger.Errorf("unable to load resource %s", filename)
+			return false
+		} else {
+			ext := filepath.Ext(filename)
+			switch ext {
+			case ".html":
+				w.Header().Set("Content-Type", "text/html; charset=utf-8")
+			case ".js":
+				w.Header().Set("Content-Type", "application/javascript; charset=utf-8")
+			case ".css":
+				w.Header().Set("Content-Type", "text/css; charset=utf-8")
+			default:
+				errPageLogger.Errorf("unexpected file type %q for %s", ext, filename)
+			}
+			w.Write(file)
+			return true
+		}
+	}
+	return false
+}
+
 var errPageLogger = logrus.WithField("middleware", "error_page")

schema/providers.schema.json

@@ -64,8 +64,7 @@
         "port": {},
         "no_tls_verify": {},
         "path_patterns": {},
-        "set_headers": {},
+        "middlewares": {}
-        "hide_headers": {}
       },
       "additionalProperties": false,
       "allOf": [
@@ -121,24 +120,8 @@
                   }
                 ]
               },
-              "set_headers": {
+              "middlewares": {
-                "type": "object",
+                "type": "object"
-                "description": "Proxy headers to set",
-                "additionalProperties": {
-                  "items": {
-                    "type": "object",
-                    "additionalProperties": {
-                      "type": "string"
-                    }
-                  }
-                }
-              },
-              "hide_headers": {
-                "type": "array",
-                "description": "Proxy headers to hide",
-                "items": {
-                  "type": "string"
-                }
               }
             }
           },
@@ -156,10 +139,7 @@
               "path_patterns": {
                 "not": true
               },
-              "set_headers": {
+              "middlewares": {
-                "not": true
-              },
-              "hide_headers": {
                 "not": true
               }
             },