From 6c2221bdccccc5e0e23e74a9b5ca852b4a418968 Mon Sep 17 00:00:00 2001
From: Mike Dillon <mike.dillon@synctree.com>
Date: Sat, 25 Oct 2014 17:13:17 -0700
Subject: [PATCH] Set "Connection: upgrade" when we receive an "Upgrade" header

Fixes #37
---
 nginx.tmpl | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/nginx.tmpl b/nginx.tmpl
index cb558e5..42599f7 100644
--- a/nginx.tmpl
+++ b/nginx.tmpl
@@ -5,6 +5,13 @@ map $http_x_forwarded_proto $proxy_x_forwarded_proto {
   ''      $scheme;
 }
 
+# If we receive Upgrade, set Connection to "upgrade"; otherwise, delete any
+# Connection header that may have been passed to this server
+map $http_upgrade $proxy_connection {
+  default upgrade;
+  ''      '';
+}
+
 server {
 	listen 80 default_server;
 	server_name _; # This is just an invalid value which will never trigger on a real hostname.
@@ -64,7 +71,8 @@ server {
 
 		# HTTP 1.1 support
 		proxy_http_version 1.1;
-		proxy_set_header Connection "";
+		proxy_set_header Upgrade $http_upgrade;
+		proxy_set_header Connection $proxy_connection;
 	}
 }
 {{ end }}