[etherpad-web/oscp-frontend] Make sure socket.io endpoint uses WS

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

commit 3a9f3061167c30d024caa94c63fc15808d248821
Author: Bartłomiej Piotrowski <bpiotrowski gnome org>
Date:   Wed May 13 11:38:30 2020 +0200

    Make sure socket.io endpoint uses WS

 app_data/httpd-cfg/etherpad.gnome.org.conf | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)
---
diff --git a/app_data/httpd-cfg/etherpad.gnome.org.conf b/app_data/httpd-cfg/etherpad.gnome.org.conf
index 1ebdea2..af0037c 100644
--- a/app_data/httpd-cfg/etherpad.gnome.org.conf
+++ b/app_data/httpd-cfg/etherpad.gnome.org.conf
@@ -9,8 +9,18 @@
     RedirectMatch ^(.*) https://letsencrypt.gnome.org$1
   </LocationMatch>
 
-  ProxyPass / http://prod.etherpad-web.svc:9001/ retry=0
-  ProxyPassReverse / http://prod.etherpad-web.svc:9001/
+  <Location />
+    ProxyPass http://prod.etherpad-web.svc:9001/ retry=0
+    ProxyPassReverse http://prod.etherpad-web.svc:9001/
+  </Location>
+
+  <Location /socket.io>
+    RewriteEngine On
+    RewriteCond %{QUERY_STRING} transport=websocket    [NC]
+    RewriteRule /(.*) ws://localhost:9001/socket.io/$1 [P,L]
+    ProxyPass http://prod.etherpad-web.svc:9001/socket.io retry=0
+    ProxyPassReverse http://prod.etherpad-web.svc:9001/socket.io
+  </Location>
 
  <Proxy *>
    Options FollowSymLinks MultiViews