Apache2 WebSockets reverse proxy on same URL

Question

How to configure Apache2 to proxy WebSocket connection (BrowserSync for example), if it's made on the same URL, with only difference being header "Upgrade: websocket" and URL schema ws://?

For example:

HTTP request:
GET http://example.com/browser-sync/socket.io/?... HTTP/1.1
...

WebSocket request:
GET ws://example.com/browser-sync/socket.io/?... HTTP/1.1
Connection: upgrade
Upgrade: websocket
Sec-WebSocket-Version: 13
...

All examples I find, redirect some path only, like "<Location /ws>..." or "ProxyPass /ws/ ws://example.com/"

My current config:

ProxyRequests off
<Location />
    ProxyPass http://127.0.0.1:3000/
    ProxyPassReverse /
</Location>

mod_proxy, mod_proxy_http and mod_proxy_wstunnel are enabled.

Community · Accepted Answer · 2017-04-13 12:13:44Z

45

Answering myself.

Using RewriteEngine, hint given by this post, and WebSocket handshake specification:

RewriteEngine On
RewriteCond %{HTTP:Connection} Upgrade [NC]
RewriteCond %{HTTP:Upgrade} websocket [NC]
RewriteRule /(.*) ws://127.0.0.1:3000/$1 [P,L]

ProxyRequests off
<Location />
    ProxyPass http://127.0.0.1:3000/
    ProxyPassReverse /
</Location>

edited Apr 13, 2017 at 12:13

CommunityBot

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answered Apr 23, 2015 at 12:37

metalim

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2 Comments

Vipin Jain Over a year ago

Great, was looking for this and will definitely try this one.

Billy Over a year ago

Helped me a lot - didn't think turning ProxyRequests to off would do the trick, but that ended up being the case. Thanks!

Ivan Ermilov · Accepted Answer · 2018-02-07 14:51:15Z

7

Thanks a lot to metalim! I publish the full configuration here for reference:

<VirtualHost *>
    ServerName example.org
    ServerAlias *.example.org
    ServerAdmin [email protected]
    ProxyRequests Off
    ProxyPreserveHost On

    RewriteEngine On
    RewriteCond %{HTTP:Connection} Upgrade [NC]
    RewriteCond %{HTTP:Upgrade} websocket [NC]
    RewriteRule /(.*) ws://192.168.1.1/$1  [P,L]

    ProxyPass / http://192.168.1.1/ retry=1
    ProxyPassReverse / http://192.168.1.1/

    ErrorLog /var/log/apache2/example.org.error.log
    CustomLog /var/log/apache2/example.org.access.log combined
</VirtualHost>

answered Feb 7, 2018 at 14:51

Ivan Ermilov

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Comments

Karel Vlk · Accepted Answer · 2023-08-17 12:21:04Z

2

Since Apache httpd 2.4.47, this can be used:

ProxyPass / http://127.0.0.1:3000/ upgrade=websocket

https://httpd.apache.org/docs/2.4/mod/mod_proxy.html#protoupgrade

answered Aug 17, 2023 at 12:21

Karel Vlk

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