From 48a4119420047b1b86b8e01b3470a3ffb1f6c400 Mon Sep 17 00:00:00 2001
From: Stefan Haun <tux@netz39.de>
Date: Mon, 4 Jul 2022 14:01:09 +0200
Subject: [PATCH] Add rewrite rules for websockets

---
 .../templates/apache-docker-proxy-site.j2                  | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/roles/setup-http-site-proxy/templates/apache-docker-proxy-site.j2 b/roles/setup-http-site-proxy/templates/apache-docker-proxy-site.j2
index 287cb0e..f81280c 100644
--- a/roles/setup-http-site-proxy/templates/apache-docker-proxy-site.j2
+++ b/roles/setup-http-site-proxy/templates/apache-docker-proxy-site.j2
@@ -33,5 +33,12 @@
     RequestHeader set "X-Forwarded-Proto" expr=%{REQUEST_SCHEME}
     RequestHeader set "X-Forwarded-SSL" expr=%{HTTPS}
 
+    <ifmodule mod_rewrite.c>
+        # see documentation of wstunnel: This allwos generic websocket passthrough
+        RewriteEngine On
+        RewriteCond %{HTTP:Upgrade} websocket [NC]
+        RewriteCond %{HTTP:Connection} upgrade [NC]
+        RewriteRule ^/?(.*) "ws://{{ backend_host | default("localhost") }}:{{ proxy_port }}/$1" [P,L]
+    </ifmodule>
 </VirtualHost>
 </IfFile>