序
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
<!DOCTYPE html>
<html>
<head>
<script src="http://www.w3school.com.cn/jquery/jquery-1.11.1.min.js"></script>
<script>
$(document).ready(function(){$("button").click(function(){$.ajax({url : '/demo/test',timeout : 10000,type : 'get',dataType : 'json',success : function(data){alert('success');}});});
});
</script>
</head>
<body><button>ajax带超时时间请求</button></body>
</html>复制代码后台接口
@GetMapping("/test")public String test(HttpServletResponse response) throws InterruptedException {Thread.sleep(100*1000);return "hello";}复制代码nginx
location /demo/ {access_log /usr/local/var/log/nginx/host.access.log main;proxy_pass http://localhost:8080/demo/ ;}复制代码关于log format如下
log_format main '$remote_addr - $remote_user [$time_local] "$request" ''$status $body_bytes_sent "$http_referer" ''"$http_user_agent" "$http_x_forwarded_for"';复制代码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" "-"复制代码doc
- 499 CLIENT CLOSED REQUEST
- 服务器排障 之 nginx 499 错误的解决
