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I'm trying to configure Apache 2.4 for proxying the websocket connection for socket.io to a node.js websocket server, using mod_proxy_wstunnel. We had this working fine with socket.io 0.9, but with the 1.0 release they changed the socket endpoint to a query parameter, and now I'm having trouble configuring apache with the correct proxy instructions.

All requests to /socket.io/?EIO=N&transport=websocket (where N is any digit, usually 2) need to be forwarded to ws://localhost:8082/socket.io/, but all other requests need to be forwarded to http://localhost:8082/socket.io/.

I've tried variations of both of the following configs:

ProxyPass /socket.io/?EIO=2&transport=websocket http://localhost:8082/socket.io/?EIO=2&transport=websocket
ProxyPassReverse /socket.io/?EIO=2&transport=websocket http://localhost:8082/socket.io/?EIO=2&transport=websocket

ProxyPass /socket.io/ http://localhost:8082/socket.io/
ProxyPassReverse /socket.io/ http://localhost:8082/socket.io/

.

RewriteRule /socket.io/?EIO=([0-9]+)&transport=websocket ws://localhost:8082/socket.io/ [QSA,P]

ProxyPass /socket.io/ http://localhost:8082/socket.io/
ProxyPassReverse /socket.io/ http://localhost:8082/socket.io/

I've gathered from my googling that ProxyPass and Locations can't target query strings, so is there any other option here? The paths are hard-coded into socket.io, so short of forking the entire library I can't change them.

Twipped
  • 643

1 Answers1

39

Use Rewrite conditions to match for this special case:

RewriteEngine On
RewriteCond %{REQUEST_URI}  ^/socket.io            [NC]
RewriteCond %{QUERY_STRING} transport=websocket    [NC]
RewriteRule /(.*)           ws://localhost:8082/$1 [P,L]

ProxyPass        /socket.io http://localhost:8082/socket.io
ProxyPassReverse /socket.io http://localhost:8082/socket.io

NOTE As Mark W noted below. These must be entered at vhost level and not at server or .htaccess level.

You can also reference a balancer:

<Proxy balancer://http-localhost/>
    BalancerMember http://localhost:8082 keepalive=On smax=1 connectiontimeout=10 retry=600 timeout=900 ttl=900
    BalancerMember http://localhost:8083 keepalive=On smax=1 connectiontimeout=10 retry=600 timeout=900 ttl=900
    ProxySet lbmethod=bytraffic
</Proxy>

<Proxy balancer://ws-localhost/>
    BalancerMember ws://localhost:8082 keepalive=On smax=1 connectiontimeout=10 retry=600 timeout=900 ttl=900
    BalancerMember ws://localhost:8083 keepalive=On smax=1 connectiontimeout=10 retry=600 timeout=900 ttl=900
    ProxySet lbmethod=bytraffic
</Proxy>

RewriteEngine On
RewriteCond %{REQUEST_URI}  ^/socket.io                [NC]
RewriteCond %{QUERY_STRING} transport=websocket        [NC]
RewriteRule /(.*)           balancer://ws-localhost/$1 [P,L]

ProxyPass        /socket.io balancer://http-localhost/socket.io
ProxyPassReverse /socket.io balancer://http-localhost/socket.io
Jaap
  • 103
PeterPramb
  • 506