Socketio interrupt error before shaking hands

The first two days to toss the next socketio, deployed after the discovery through Nginx proxy front end of the socket can not communicate with the back end, and then check a pass, and finally solve the problem:

Location/{    Proxy_pass http://127.0.0.1:9999;    Proxy_connect_timeout;    Proxy_set_header Host $host;    Proxy_set_header x-real-ip $remote _addr;    Proxy_set_header x-forwarded-for $proxy _add_x_forwarded_for;    Proxy_set_header x-nginx-proxy true;    # Below are the key    Proxy_http_version 1.1;    Proxy_set_header Upgrade $http _upgrade;    Proxy_set_header Connection "Upgrade";    # This is the configuration Webpysessoin missing issue    Fastcgi_param  script_name        "";}

Reference: 1. Http://nginx.org/en/docs/http/websocket.html

Socketio interrupt error before shaking hands