diff --git a/internal/net/http/middleware/redirect_http.go b/internal/net/http/middleware/redirect_http.go
index 595580e..e82b573 100644
--- a/internal/net/http/middleware/redirect_http.go
+++ b/internal/net/http/middleware/redirect_http.go
@@ -2,6 +2,7 @@ package middleware
 
 import (
 	"net/http"
+	"strings"
 
 	"github.com/yusing/go-proxy/internal/common"
 )
@@ -10,7 +11,12 @@ var RedirectHTTP = &Middleware{
 	before: func(next http.HandlerFunc, w ResponseWriter, r *Request) {
 		if r.TLS == nil {
 			r.URL.Scheme = "https"
-			r.URL.Host = r.URL.Hostname() + ":" + common.ProxyHTTPSPort
+			host := r.Host
+			if i := strings.Index(host, ":"); i != -1 {
+				host = host[:i] // strip port number if present
+			}
+			r.URL.Host = host + ":" + common.ProxyHTTPSPort
+			logger.Info().Str("url", r.URL.String()).Msg("redirect to https")
 			http.Redirect(w, r, r.URL.String(), http.StatusTemporaryRedirect)
 			return
 		}