have node.js websockets running through haproxy, and has been running successfully for several months.
now now giving error
Error during WebSocket handshake: 'Connection' header value is not 'Upgrade'
same code / setup is still working on development computer
any ideas / suggestions more than appreciated!
firefox works ok! chrome errors from main server, but works correctly local
There is something terribly concerning here with this error message. The "Connection" header value should not be "Upgrade" but should contain "Upgrade". "Connection" is an HTTP header field which is hop-by-hop and may contain multiple tokens, including Upgrade, but also a number of other ones. This is in RFC6455 page 17 :
" 5. The request MUST contain an |Upgrade| header field whose value MUST include the "websocket" keyword."
So I think that something is wrong in the server software, or at least in the error message. You should definitely take a network capture to be sure.