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本文主要来聊一下nginx的access log当中出现的499问题。

问题描述

499 CLIENT CLOSED REQUEST

A non-standard status code introduced by nginx for the case when a client closes the connection while nginx is processing the request.

原因

服务器返回http头之前，客户端就提前关闭了http连接，常见于后台接口处理时间比较长，而前端请求又自带有超时时间。

复现

请求实例

$(document).ready(function(){

$("button").click(function(){

$.ajax({

url : '/demo/test',

timeout : 10000,

type : 'get',

dataType : 'json',

success : function(data){

alert('success');

}

});

});

});

ajax带超时时间请求

后台接口

@GetMapping("/test")

public String test(HttpServletResponse response) throws InterruptedException {

Thread.sleep(100*1000);

return "hello";

}

nginx

location /demo/ {

access_log /usr/local/var/log/nginx/host.access.log main;

proxy_pass http://localhost:8080/demo/ ;

}

关于log format如下

log_format main '$remote_addr - $remote_user [$time_local] "$request" '

'$status $body_bytes_sent "$http_referer" '

'"$http_user_agent" "$http_x_forwarded_for"';

log实例

127.0.0.1 - - [04/Nov/2017:01:11:29 +0800] "GET /demo/test HTTP/1.1" 499 0 "http://localhost:8888/demo.html" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36" "-"

127.0.0.1 - - [04/Nov/2017:01:11:42 +0800] "GET /demo/test HTTP/1.1" 499 0 "http://localhost:8888/demo.html" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36" "-"

127.0.0.1 - - [04/Nov/2017:01:11:58 +0800] "GET /demo/test HTTP/1.1" 499 0 "http://localhost:8888/demo.html" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36" "-"

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