websocket多级nginx代理

在使用多层Nginx代理时，WebSocket的连接可能会遇到一些问题，因为WebSocket连接是持久化的，它需要Upgrade头部来确认升级到WebSocket协议。在多层代理的情况下，每层代理可能会修改或丢失这个Upgrade头部信息。

为了确保WebSocket能够在多层代理下正确工作，你需要确保每层代理都正确地处理WebSocket的Upgrade请求。

以下是一个Nginx配置的例子，展示了如何在多层代理中正确配置WebSocket：

# 第一层Nginx配置
server {
listen 80;
server_name example.com;

location / {
proxy_pass http://backend;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
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-Forwarded-Proto $scheme;
}
}

# 第二层Nginx或应用服务器配置
upstream backend {
server backend1.example.com;
server backend2.example.com;
}

server {
listen 80;
server_name backend*.example.com;

location / {
proxy_pass http://websocket_backend;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
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-Forwarded-Proto $scheme;
}
}

# WebSocket后端配置
upstream websocket_backend {
server websocket_backend1;
}

server {
listen 80;
server_name websocket_backend*;

location / {
proxy_pass http://websocket_app_server;
proxy_http_version 1.1;
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-Forwarded-Proto $scheme;
}
}