From 3acf6fe53928bc8be68e24d7e192f3eca1f34865 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Mon, 18 Jan 2021 10:35:47 +0100
Subject: [PATCH] c-hyper: avoid duplicated Proxy-Connection headers

---
 lib/c-hyper.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/c-hyper.c b/lib/c-hyper.c
index 5e7a76f808..14b20be5d1 100644
--- a/lib/c-hyper.c
+++ b/lib/c-hyper.c
@@ -800,6 +800,7 @@ CURLcode Curl_http(struct Curl_easy *data, bool *done)
 
 #ifndef CURL_DISABLE_PROXY
   if(conn->bits.httpproxy && !conn->bits.tunnel_proxy &&
+     !Curl_checkheaders(data, "Proxy-Connection") &&
      !Curl_checkProxyheaders(data, conn, "Proxy-Connection")) {
     if(Curl_hyper_header(data, headers, "Proxy-Connection: Keep-Alive"))
       goto error;
-- 
2.47.3