nginx 长连接 健康检查 request_id

upstream test {
         server 10.10.10.10:5800;
         server 10.10.10.11:5800;
         server 10.10.10.12:5800;
         keepalive  512;
         check interval=3000 rise=2 fall=3 timeout=1000 type=http;
         check_keepalive_requests 100;
         check_http_send "GET /actuator/health/ HTTP/1.0\r\nConnection: keep-alive\r\n\r\n";
         check_http_expect_alive http_2xx http_3xx;
}

server {
        listen       80;
        server_name  test.xueanguo.com;
        access_log /data/nginx_log/access.log json buffer=16k;
        error_log  /data/nginx_log/error.log;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For  $proxy_add_x_forwarded_for;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Request-ID      $request_id;
        proxy_http_version  1.1;
        proxy_set_header   Connection   "";

location /health_status {
        check_status;
        access_log   off;
        }
location / {
        proxy_pass http://test;
        }
}