Bug report : ha-proxy/1.4.18 & nginx/1.5.6 don't work

[Icham Achtir]

see https://github.com/abourget/gevent-socketio/issues/167
Without proxy everything work
With ngninx proxy or ha proxy gevent-socketio dosen't work
Tested with simple_chat and cpu_graph app.

when i start the  live_cpu_graph
on firebug i see the ugrade socket, i see also on the terminal the  socket request
But no answer from the  socketio_manage(environ, {'': ChatNamespace}, self.request)
Nothing special on the haproxy & nginx proxy log

gevent-socketio : version 0.3.6
nginx :  version 1.5.6
HA-Proxy: version 1.4.18 2011/09/16

configuration with nginx proxy

upstream app_graph {
    server localhost:8090;    
}

map $http_upgrade $connection_upgrade {
    default upgrade;
    ''      close;
}
server {
    listen 80;
    root /home/dev/live_cpu_graph/live_cpu_graph;
    index index.html index.htm;
 
    server_name _;
 
    location / {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
        proxy_set_header X-NginX-Proxy true;
       
        proxy_pass http://app_graph/;
        proxy_redirect off;
       
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
       
        proxy_set_header Host $host;
    }
}

HA config

global
    maxconn 4096
    daemon

defaults
    mode http
    log 127.0.0.1 local1 debug
    option httplog

frontend all 0.0.0.0:80
    timeout client 86400000
    default_backend www_backend
    acl is_websocket hdr(Upgrade) -i WebSocket
    acl is_websocket path_beg /socket.io/

    use_backend socket_backend if is_websocket

backend www_backend
    balance roundrobin
    option forwardfor # This sets X-Forwarded-For
    option httpclose
    timeout server 30000
    timeout connect 4000
    server server1 localhost:81 weight 1 maxconn 1024 check

backend socket_backend
    balance roundrobin
    option forwardfor # This sets X-Forwarded-For
    option httpclose
    timeout queue 5000
    timeout server 86400000
    timeout connect 86400000
    server server1 localhost:8090 weight 1 maxconn 1024 check

HAproxy nginx conf

server {
  listen 81;
  server_name myapp.example.com;
  root /home/icham/dev/live_cpu_graph/live_cpu_graph;
  index index.html index.htm chat.html;
  server_name _;
}