flask 程序使用 websocket，部署使用 gunicorn， gunicorn 导致 websocket 运行有问题

#1 本地开发 flask 应用程序，里面使用了 websocket，异步模式使用得是 gevent，并在程序刚开始打了 gevent 猴子补丁，s 端主要监听 connect disconnect 两个事件用来做一些前端页面的初始化和离开动作。启动代码：

socketio.run(app=app, host='0.0.0.0', port=5000, debug=True)

#2 正常在本地 debug 或 run 都没问题，部署到测试环境遇到问题，测试环境采用得是 Nginx+supervisor+gunicorn+flask， nginx 配置：

    server {
        listen       8000;
        listen       [::]:8000;
        server_name  x.x.x.x;
        root /root/python/asset;
        location / {
            	proxy_pass http://127.0.0.1:5000;
	    	proxy_redirect off;
	    	proxy_set_header Host $host;
	    	proxy_set_header X-Real-IP $remote_addr;
	    	proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
	    	access_log /var/log/asset/access.log;
	    	error_log /var/log/asset/error.log;
	    	proxy_set_header Upgrade $http_upgrade;
            	proxy_set_header Connection "Upgrade";
        }
    }

supervisor 配置：

[program:xx]
directory = /root/python/xx
command = /root/.local/xxx/bin/gunicorn -b 127.0.0.1:5000 -k geventwebsocket.gunicorn.workers.GeventWebSocketWorker -w 1 module:app
user = root
autostart = true
autorestart = true
stopasgroup = true
killasgroup = true
startsecs = 5
startretries = 3
redirect_stderr = true
stdout_logfile_maxbytes = 20MB
stdout_logfile_backups = 20
stdout_logfile = /var/log/xx/stdout.log
stderr_logfile = /var/log/xx/stderr.log

其中启动 gunicorn 的命令参考自
https://stackoverflow.com/questions/38624447/websockets-proxied-by-nginx-to-gunicorn-over-https-giving-400-bad-request
https://segmentfault.com/q/1010000007495163
https://flask-socketio.readthedocs.io/en/latest/#gunicorn-web-server
gunicorn 也在 pipenv 环境下安装

#3 不使用 gunicorn 的情况下没任何问题，如图：使用了 gunicorn 的情况，
首先会导致 402 错误，
402 详情，
其次，会一直 pending，一直在发请求，
最后是 402 详情在控制台的信息，
请各位帮帮忙，尝试了好长时间没办法解决，感谢各位。

hanssx

2018-10-11 16:47:12 +08:00

@itertools 是的，不支持 py3，真是我的锅，第一次部署花了很多时间，使用了 gevent 之后没有 402 错误了，但是会一直 pending，gunicorn 日志显示好像是心跳包，正在找办法关了它。。。
[2018-10-11 16:40:27 +0800] [12128] [INFO] Shutting down: Master
[2018-10-11 16:41:47 +0800] [13014] [INFO] Starting gunicorn 19.9.0
[2018-10-11 16:41:47 +0800] [13014] [INFO] Listening at: http://127.0.0.1:5000 (13014)
[2018-10-11 16:41:47 +0800] [13014] [INFO] Using worker: gevent
[2018-10-11 16:41:47 +0800] [13017] [INFO] Booting worker with pid: 13017
Server initialized for gevent.
94207eaf37114c118b05480ba12679ef: Sending packet OPEN data {'sid': '94207eaf37114c118b05480ba12679ef', 'upgrades': [], 'pingTimeout': 60000, 'pingInterval': 25000}
94207eaf37114c118b05480ba12679ef: Sending packet MESSAGE data 0
94207eaf37114c118b05480ba12679ef: Received packet MESSAGE data 0/process_upload_csv
94207eaf37114c118b05480ba12679ef: Sending packet MESSAGE data 0/process_upload_csv
94207eaf37114c118b05480ba12679ef: Received packet PING data None
94207eaf37114c118b05480ba12679ef: Sending packet PONG data None
94207eaf37114c118b05480ba12679ef: Received packet PING data None
94207eaf37114c118b05480ba12679ef: Sending packet PONG data None
94207eaf37114c118b05480ba12679ef: Received packet PING data None