From 00a2a1adf207c47e105bf76ee793b78d14e68018 Mon Sep 17 00:00:00 2001
From: fhgffy <102001626+fhgffy@users.noreply.github.com>
Date: Wed, 14 Oct 2026 00:29:37 +0800
Subject: [PATCH] fix(http): preserve chunked request framing

---
 proxy/http/http.go        |  4 +-
 proxy/http/server_test.go | 99 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 102 insertions(+), 1 deletion(-)
 create mode 100644 proxy/http/server_test.go

diff --git a/proxy/http/http.go b/proxy/http/http.go
index 565e91d..3de28e1 100644
--- a/proxy/http/http.go
+++ b/proxy/http/http.go
@@ -72,6 +72,9 @@ func parseStartLine(line string) (r1, r2, r3 string, ok bool) {
 }
 
 func cleanHeaders(header textproto.MIMEHeader) {
+	if len(header.Values("Transfer-Encoding")) > 0 {
+		header.Del("Content-Length")
+	}
 	header.Del("Proxy-Connection")
 	header.Del("Connection")
 	header.Del("Keep-Alive")
@@ -79,7 +82,6 @@ func cleanHeaders(header textproto.MIMEHeader) {
 	header.Del("Proxy-Authorization")
 	header.Del("TE")
 	header.Del("Trailers")
-	header.Del("Transfer-Encoding")
 	header.Del("Upgrade")
 }
 
diff --git a/proxy/http/server_test.go b/proxy/http/server_test.go
new file mode 100644
index 0000000..d07b6f4
--- /dev/null
+++ b/proxy/http/server_test.go
@@ -0,0 +1,99 @@
+package http
+
+import (
+	"bufio"
+	"bytes"
+	"io"
+	"net"
+	stdhttp "net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/nadoo/glider/proxy"
+)
+
+type directTestProxy struct{}
+
+func (directTestProxy) Addr() string { return "direct" }
+func (p directTestProxy) Dial(network, addr string) (net.Conn, proxy.Dialer, error) {
+	c, err := net.Dial(network, addr)
+	return c, &proxy.Direct{}, err
+}
+func (directTestProxy) DialUDP(string, string) (net.PacketConn, proxy.UDPDialer, error) {
+	return nil, &proxy.Direct{}, proxy.ErrNotSupported
+}
+func (directTestProxy) NextDialer(string) proxy.Dialer { return &proxy.Direct{} }
+func (directTestProxy) Record(proxy.Dialer, bool)      {}
+
+func TestServeForwardsChunkedRequestBody(t *testing.T) {
+	origin := httptest.NewServer(stdhttp.HandlerFunc(func(w stdhttp.ResponseWriter, r *stdhttp.Request) {
+		body, err := io.ReadAll(r.Body)
+		if err != nil {
+			stdhttp.Error(w, err.Error(), stdhttp.StatusBadRequest)
+			return
+		}
+		w.Write(body)
+	}))
+	defer origin.Close()
+	client, server := net.Pipe()
+	defer client.Close()
+	client.SetDeadline(time.Now().Add(3 * time.Second))
+	done := make(chan struct{})
+	go func() {
+		defer close(done)
+		s := &HTTP{proxy: directTestProxy{}}
+		s.Serve(server)
+	}()
+	request := "POST " + origin.URL + "/upload HTTP/1.1\r\n" +
+		"Host: " + strings.TrimPrefix(origin.URL, "http://") + "\r\n" +
+		"Transfer-Encoding: chunked\r\nConnection: close\r\n\r\n" +
+		"5\r\nhello\r\n6\r\n world\r\n0\r\n\r\n"
+	if _, err := io.WriteString(client, request); err != nil {
+		t.Fatal(err)
+	}
+	response, err := stdhttp.ReadResponse(bufio.NewReader(client), nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer response.Body.Close()
+	body, err := io.ReadAll(response.Body)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if response.StatusCode != stdhttp.StatusOK || string(body) != "hello world" {
+		t.Fatalf("upstream response = %d %q, want 200 hello world", response.StatusCode, body)
+	}
+	client.Close()
+	<-done
+}
+
+func TestRequestFramingHeaders(t *testing.T) {
+	for _, tt := range []struct {
+		name           string
+		headers        string
+		transferCoding bool
+		contentLength  bool
+	}{
+		{"chunked", "Transfer-Encoding: chunked\r\n", true, false},
+		{"chunked with length", "Transfer-Encoding: chunked\r\nContent-Length: 1\r\n", true, false},
+		{"content length", "Content-Length: 11\r\n", false, true},
+	} {
+		t.Run(tt.name, func(t *testing.T) {
+			raw := "POST http://example.com/upload HTTP/1.1\r\nHost: example.com\r\n" + tt.headers + "\r\n"
+			req, err := parseRequest(bufio.NewReader(strings.NewReader(raw)))
+			if err != nil {
+				t.Fatal(err)
+			}
+			var wire bytes.Buffer
+			req.WriteBuf(&wire)
+			if got := strings.Contains(wire.String(), "Transfer-Encoding:"); got != tt.transferCoding {
+				t.Errorf("Transfer-Encoding present = %v, want %v", got, tt.transferCoding)
+			}
+			if got := strings.Contains(wire.String(), "Content-Length:"); got != tt.contentLength {
+				t.Errorf("Content-Length present = %v, want %v", got, tt.contentLength)
+			}
+		})
+	}
+}