nginx通过配置empty_gif解决请求favicon 404的问题

背景介绍

因为一些浏览器在访问网站时会默认去请求网站的favicon，但是我的网站(Tengine)上并没有这些icon图片，因此在访问日志里会出现大量的404错误，会触发一些没必要日志告警。
我们可以通过配置nginx empty_gif来给请求返回一个1x1，大小为43字节的空白图片来解决这个问题。这个给请求返回一个空白图片的做法经常用在网站统计等需求里。

empty_gif模块的官方链接地址：http://nginx.org/en/docs/http/ngx_http_empty_gif_module.html

配置

我统计我的日志里访问icon的请求，请求的目标文件总共有三个，所以对这些请求全部做返回空白图片处理。

nginx上添加如下配置：

location ~ ^/(apple-touch-icon.png|apple-touch-icon-precomposed.png|favicon.ico){
empty_gif;
}

测试

Wget

[root@thatsit vhosts]# cd /tmp/
[root@thatsit tmp]# wget http://www.thatsit.cc/favicon.ico
--2017-01-09 11:35:32-- http://www.thatsit.cc/favicon.ico
Resolving www.thatsit.cc... 10.10.10.101
Connecting to www.thatsit.cc|10.10.10.101|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 43 [image/gif]
Saving to: “favicon.ico”

100%[=============================================================================================>] 43 --.-K/s in 0s

2017-01-09 11:35:32 (8.85 MB/s) - “favicon.ico” saved [43/43]

[root@thatsit tmp]# 
[root@thatsit tmp]# wget http://www.thatsit.cc/apple-touch-icon-precomposed.png
--2017-01-09 11:36:29-- http://www.thatsit.cc/apple-touch-icon-precomposed.png
Resolving www.thatsit.cc... 10.10.10.101
Connecting to www.thatsit.cc|10.10.10.101|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 43 [image/gif]
Saving to: “apple-touch-icon-precomposed.png”

100%[=============================================================================================>] 43 --.-K/s in 0s

2017-01-09 11:36:29 (12.3 MB/s) - “apple-touch-icon-precomposed.png” saved [43/43]

[root@thatsit tmp]#
[root@thatsit tmp]# wget http://www.thatsit.cc/apple-touch-icon.png
--2017-01-09 11:36:47-- http://www.thatsit.cc/apple-touch-icon.png
Resolving www.thatsit.cc... 10.10.10.101
Connecting to www.thatsit.cc|10.10.10.101|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 43 [image/gif]
Saving to: “apple-touch-icon.png”

100%[=============================================================================================>] 43 --.-K/s in 0s

2017-01-09 11:36:47 (12.3 MB/s) - “apple-touch-icon.png” saved [43/43]

[root@thatsit tmp]# ll
total 24
-rw-r--r-- 1 root root 43 Sep 28 1970 apple-touch-icon.png
-rw-r--r-- 1 root root 43 Sep 28 1970 apple-touch-icon-precomposed.png
-rw-r--r-- 1 root root 43 Sep 28 1970 favicon.ico
[root@thatsit tmp]#

Curl

[root@thatsit tmp]# curl -XGET -I http://www.thatsit.cc/apple-touch-icon.png
HTTP/1.1 200 OK
Server: Tengine
Date: Mon, 09 Jan 2017 03:39:32 GMT
Content-Type: image/gif
Content-Length: 43
Last-Modified: Mon, 28 Sep 1970 06:00:00 GMT
Connection: keep-alive

[root@thatsit tmp]#