Haproxy support for draft 76

[majek]

Reference: ninenines/cowboy#73

In order to get Hixie76 through a HAProxy loadbalancer the server must send response headers before the request nonce is received. In other words: before haproxy will send extra data from the client it expects the server to respond to the header. Current implementation does not support that. Example (nc localhost 8000 and paste):

GET /demo HTTP/1.1
Upgrade: WebSocket
Connection: Upgrade
Host: example.com
Origin: http://example.com
Sec-WebSocket-Key1: 4 @1  46546xW%0l 1 5
Sec-WebSocket-Key2: 12998 5 Y3 1  .P00

Result:

HTTP/1.1 101 Web Socket Protocol Handshake
Upgrade: WebSocket
Connection: Upgrade
Sec-WebSocket-Origin: http://example.com
Sec-WebSocket-Location: ws://example.com/demo

��(�]#�������z2%

Expected result: server replying with headers, waiting for 8 byte nonce, and replying with nonce.

[jcoglan]

I've tried connecting Safari, which uses draft-76 to my server via HAProxy and it works fine. How do I reproduce this problem?

[majek]

Well, it doesn't work for me. Haproxy 1.4.15, here's simplified config:

defaults
    mode http
    # Set timeouts to your eneds
    timeout client  5s
    timeout connect 5s
    timeout server  5s

frontend all 0.0.0.0:9999
    mode http
    timeout client 120s

    option forwardfor
    option http-server-close
    option http-pretend-keepalive

    default_backend sockjs

backend sockjs
    balance uri depth 2
    timeout server  120s
    server srv_sockjs1 127.0.0.1:8080

[jcoglan]

Fixed in 7e2461e.

[jcoglan]

This fix and the other bugs you reported are fixed in release 0.1.2. Thanks a lot for reporting them!