如何从Nginx错误日志获取用户代理，引荐来源网址

Question

guys,

I see a lot of errors like the following in my nginx's error.log :

2016/01/06 15:57:41 [error] 9054#0: *381280040 open() "/mypath/current/public/images/default_avatar.png" failed (2: No such file or directory), client: 222.83.227.19, server: mydomain.com, request: "GET //images/default_avatar.png HTTP/1.1", host: "www.mydomain.com"

But I could not find a place where I've wrongly referred to the image. Is there a way that I could print the user-agent and referrer of this request, so that I could find out where I've done wrong?

Best Regards. Larry

Answer 1

您可能会寻找log_format的定义位置，然后添加"$http_referer" "$http_user_agent" 。

Answer 2

You can use access_log to log requests with HTTP status codes 4xx (Client errors) and 5xx (Server errors) except 499 which is nginx Status code for client connection close.

#access_log      off;
map $status $loggable {
    ~^[45]  1;
    499     0; # client closed connection
    default 0;
}
access_log /var/log/nginx/error.log combined if=$loggable;