nginx反向代理报400

编写版本：v3.5.0
适用版本：所有版本

代理是不允许出现下划线，否则会报400

如：

    location /iform/ {        
        proxy_pass    http://iform_gateway:15100/iform/;
    }

解决方式：将主机名或域名通过upstream包装一层

upstream gateway {
    server iform_gateway:15100 weight=2;
}

server {
    listen        80;
    server_name    localhost;
    location / {
        root    html;
        index    index.html index.htm;
    }

    location /iform/ {
        proxy_pass    http://gateway/iform/;
    }

    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   html;
    }
}

websoket代理，报400

报以下错误：
error during Hebsocket handshake:Unexpected response code:400

解决方法：

参考：https://github.com/socketio/socket.io/issues/1942 说的很具体。

基本确定原因出在nginx配置

#修改nginx.conf配置

server {
   location / {
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
     }
}