signalr 默认会调用websocket去连接集线器，centos下，用nginx默认设置不支持ws的
所以，必须更改配置，让nginx通过websocket
server {
listen 80;
server_name admin.mu-booking.com;
location / {
proxy_pass http://127.0.0.1:5000;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection upgrade;
proxy_set_header Host $host;
proxy_cache_bypass $http_upgrade;
}
}
关键
proxy_set_header Connection upgrade，
默认key-alive的，改成upgrade
centos nginx配置支持WebSocket(signalR)
原文：https://www.cnblogs.com/drek_blog/p/10823020.html