Socket.io bad request with response {"code":0,"message":"Transport unknown"}?

javascript node.js socket.io http-status-code-400
JVE999 picture JVE999 · May 30, 2014 · Viewed 40.7k times · Source

I'm trying to run socket.io and I'm getting a bunch of these:

http://domain.com:8080/socket.io/?EIO=2&transport=polling&t=1401421022966-0 400 (Bad Request)

This is the response I'm getting:

{"code":0,"message":"Transport unknown"}

I can't find any reason. I read somewhere that it might be misinterpreting the client, but that's about as far as I could get.

Answer

johnl picture johnl · Jun 8, 2014

I had the same issue,after upgrading from 0.9.x, turns out my server config was set to ['websocket', 'jsonp-polling'] which was valid in 0.9 but the default config for the client and server is now ['polling', 'websocket']. Removing my server config got me up and running.

The config is now documented in engine.io (https://github.com/automattic/engine.io), the new transport layer introduced in 1.0 - in particular this line:
transports ( String): transports to allow connections to (['polling', 'websocket'])

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