WebSocket through SSL with Apache reverse proxy

Question

On the client side, I am trying to establish the wss connection:

var ws = new WebSocket("wss://wsserver.com/test")

and it returns an error:

WebSocket connection to 'wss://wsserver.com/test' failed: Error during WebSocket handshake: Unexpected response code: 400

The full headers are:

Request Headers

GET wss://wsserver.com/test HTTP/1.1
Host: wsserver.com
Connection: Upgrade
Pragma: no-cache
Cache-Control: no-cache
Upgrade: websocket
Origin: https://website.net
Sec-WebSocket-Version: 13
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36
Accept-Encoding: gzip, deflate, sdch, br
Accept-Language: en-US,en;q=0.8
Sec-WebSocket-Key: Tj9AJ5TKglNf5LoHsQTpvQ==
Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits

Response Headers

Access-Control-Allow-Credentials:true
Access-Control-Allow-Origin:https://website.net
Connection:close
Content-Length:18
Content-Type:text/plain; charset=utf-8
Date:Fri, 21 Apr 2017 21:03:45 GMT
Server:Apache/2.4.18 (Ubuntu)
Vary:Origin
X-Content-Type-Options:nosniff

The server side is running on go at port 8888 behind an Apache reverse proxy. This is the Apache configuration:

<VirtualHost *:443>
        ServerName website.com

        ProxyPreserveHost On
        ProxyRequests Off
        ProxyPass "/" "wss://localhost:8888/"

mod_proxy and mod_proxy_wstunnel are installed.

Is there something missing here? It seems like the request goes through but no connection is established.

Answer 1

@ pimgeek's Comment:

I think instead of RewriteRule ^/nodered/comms wss://localhost:1880/nodered/comms [P,L]

you could have utilized $1 as follow: RewriteRule ^/nodered/comms$ wss://localhost:1880/$1 [P,L]

Also, this should work aswell: RewriteRule ^/nodered/comms$ wss://localhost:1880$1 [P,L]

Notice the not needed / after the port, since $1 includes already a / at the beginning

Answer 2

I ended up solving this problem by using this configuration for the virtual host, which filters requests using the HTTP headers:

<VirtualHost *:443>
    ServerName website.com

    RewriteEngine On

    # When Upgrade:websocket header is present, redirect to ws
    # Using NC flag (case-insensitive) as some browsers will pass Websocket
    RewriteCond %{HTTP:Upgrade} =websocket [NC]
    RewriteRule ^/ws/(.*)    wss://localhost:8888/ws/$1 [P,L]

    # All other requests go to http
    ProxyPass "/" "http://localhost:8888/"

I'm leaving this as a reference in case it helps others