通过路径分流实现哪吒探针面板与rpc使用同域名

优点：cool，适合强迫症患者

原理：哪吒探针的rpc请求都具有相同的一段path，因此可通过path进行分流，nginx，caddy，cf tunnel都支持。可以通过cf waf规则拦截请求来找到具体的path。

我们采用/proto.NezhaService/这一段path来分流，通过配置使路径带/proto.NezhaService/的请求发送到哪吒监控端的rpc端口，其它请求则发送到面板端口

nginx配置

user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
        worker_connections 768;
        # multi_accept on;
}

http {
  upstream grpcservers {
    server localhost:5555;
    keepalive 1024;
  }

  server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name demo.com;

    ssl_certificate          /opt/nezha/nezha.pem;
    ssl_certificate_key      /opt/nezha/nezha.key;

    underscores_in_headers on;

    location / {
      proxy_pass http://localhost:80;
      proxy_set_header Host $http_host;
      proxy_set_header      Upgrade $http_upgrade;
    }

    location ~ ^/(ws|terminal/.+)$  {
      proxy_pass http://localhost:80;
      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection "Upgrade";
      proxy_set_header Host $http_host;
    }

    location ^~ /proto.NezhaService/ {
      grpc_read_timeout 300s;
      grpc_send_timeout 300s;
      grpc_socket_keepalive on;
      grpc_pass grpc://grpcservers;
    }
  }
}

如果使用cf tunnel，由于cf tunnel是从上往下匹配的，注意将/proto.NezhaService/转发放在上面，否则会得到404报错