nginx比较强大,可以针对单个域名请求做出单个连接超时的配置.

比如些动态解释和静态解释可以根据业务的需求配置

proxy_connect_timeout :后端服务器连接的超时时间_发起握手等候响应超时时间

proxy_read_timeout:连接成功后_等候后端服务器响应时间_其实已经进入后端的排队之中等候处理（也可以说是后端服务器处理请求的时间）

proxy_send_timeout :后端服务器数据回传时间_就是在规定时间之内后端服务器必须传完所有的数据

server
  {
 listen       80;
 server_name www.qq.cn;
 index index.jsp index.do index.html;
 root  /data/webapp/qqroot;

#limit_conn   crawler  20;

location /(WEB-INF)/ {
  deny all;
 }

location / {
  proxy_pass http://192.168.1.31:8081;
  proxy_connect_timeout 500s;
  proxy_read_timeout 500s;
  proxy_send_timeout 500s;
  proxy_set_header        X-Real-IP $remote_addr;
  proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header        Host $http_host;
 }

location ~* (\.jpg)|(\.gif)|(\.png)|(\.swf)|(\.html)|(\.htm)|(\.exe)|(\.flv)|(\.doc)|(\.rar)|(\.rtf)|(\.bmp)|(\.xls)$
 {
  root /data/webapp/qqroot/;
 }

location ~ .*\.(gif|jpg|jpeg|png|bmp|swf)$
 {
  expires      30d;
 }

}

proxy_connect_timeout

语法: proxy_connect_timeout timeout_in_seconds

上下文: http, server, location

This directive assigns a timeout for the connection to the proxyserver. This is not the time until the server returns the pages, this is the [#proxy_read_timeout proxy_read_timeout] statement. If your proxyserver is up, but hanging (e.g. it does not have enough threads to process your request so it puts you in the pool of connections to deal with later), then this statement will not help as the connection to the server has been made. It is necessary to keep in mind that this time out cannot be more than 75 seconds.

proxy_read_timeout

语法: proxy_read_timeout the_time

默认值: proxy_read_timeout 60

上下文: http, server, location

This directive sets the read timeout for the response of the proxied server. It determines how long NGINX will wait to get the response to a request. The timeout is established not for entire response, but only between two operations of reading.

In contrast to [#proxy_connect_timeout proxy_connect_timeout] , this timeout will catch a server that puts you in it's connection pool but does not respond to you with anything beyond that. Be careful though not to set this too low, as your proxyserver might take a longer time to respond to requests on purpose (e.g. when serving you a report page that takes some time to compute). You are able though to have a different setting per location, which enables you to have a higher proxy_read_timeout for the report page's location.

If the proxied server nothing will communicate after this time, then nginx is shut connection.

proxy_send_timeout

语法: proxy_send_timeout time_in_seconds

默认值: proxy_send_timeout 60

上下文: http, server, location

This directive assigns timeout with the transfer of request to the proxy server. Time out is established not on entire transfer of request, but only between two operations of record. If after this time the proxy server will not take new data, then nginx is shut the connection

proxy_connect_timeout、proxy_read_timeout、proxy_send_timeout

proxy_connect_timeout  是和后端建立连接的超时时间，记住不要超过 75s 。如果超时，Nginx 的返回码是多少？ 504

proxy_read_timeout  是从后端读取数据的超时时间，两次读取操作的时间间隔如果大于这个值，和后端的连接会被关闭。如果一个请求时间时间非常大，要把这个值设大点。如果超时，Nginx 的返回码是多少？ 504

proxy_send_timeout  是向后端写数据的超时时间，两次写操作的时间间隔大于这个值，也就是过了这么长时间后端还是没有收到数据(我理解是 根据 TCP ACK 判断)，连接会被关闭。如果超时，Nginx 的返回码是多少？ 504