From 42caa647435e102000fb6840e21c155445749935 Mon Sep 17 00:00:00 2001
From: Quentin McGaw <quentin.mcgaw@gmail.com>
Date: Mon, 29 May 2023 09:40:37 +0000
Subject: [PATCH] fix(httpproxy): redirect from http to https

---
 internal/httpproxy/handler.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/internal/httpproxy/handler.go b/internal/httpproxy/handler.go
index 39f2cc7a8..4921a8cd2 100644
--- a/internal/httpproxy/handler.go
+++ b/internal/httpproxy/handler.go
@@ -2,7 +2,6 @@ package httpproxy
 
 import (
 	"context"
-	"fmt"
 	"net/http"
 	"sync"
 	"time"
@@ -66,5 +65,8 @@ var hopHeaders = [...]string{ //nolint:gochecknoglobals
 
 // Do not follow redirect, but directly return the redirect response.
 func returnRedirect(*http.Request, []*http.Request) error {
-	return fmt.Errorf("%w", http.ErrUseLastResponse)
+	// WARNING: do not wrap this error!
+	// The standard library code checking against it does not use
+	// Go 1.13 `errors.Is` but `==`, so we cannot wrap it.
+	return http.ErrUseLastResponse
 }