Fix path remapping and add forwarded content length

server/caddy_rewrite.go

@@ -1,19 +1,25 @@
 package server
 
 import (
-	"fmt"
 	"net/http"
+	"strconv"
 )
 
 func rewriteHeaders(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		forwardedMethod := r.Header.Get("X-Forwarded-Method")
 		forwardedUri := r.Header.Get("X-Forwarded-Uri")
-
-		fmt.Printf("Headers: %s, %s\n", forwardedMethod, forwardedUri)
+		forwardedContentLength := r.Header.Get("X-Forwarded-Content-Length")
 
 		r.Method = forwardedMethod
-		r.RequestURI = forwardedUri
+		r.URL.Path = forwardedUri
+		contentLength, err := strconv.Atoi(forwardedContentLength)
+
+		if err != nil {
+			http.Error(w, "Bad forwarded content length", 400)
+		}
+
+		r.ContentLength = int64(contentLength)
 
 		next.ServeHTTP(w, r)
 	})

test_assets/Caddyfile

@@ -1,6 +1,10 @@
 http://localhost:8001 {
   forward_auth http://localhost:8080 {
     uri /auth
+    
+    header_up X-Forwarded-Content-Length {header.content-length}
+
+    copy_headers Remote-User
   }
 
   templates