来自某个ISP的请求需要很长时间

我们有一个运行在虚拟机上的PHP的Apache服务器。文档根目录位于用户的主文件夹（ /home/users/{first letter}/{username}/ ）内，而/home/users/则通过NFS进行安装。

看来有什么奇怪的事情发生。当一些用户请求一个文件（在这个例子中，我使用Hondenbol.png ）它需要很Hondenbol.png （起初用户认为它根本没有加载），而对于其他人（对于我来说，在这种情况下）它几乎立即加载。

这是该vHost的Apache日志文件的一部分。我注意到的唯一奇怪的事情就是HTTP状态码之后的数字，据我所知，这是（来自Apache文档）。

 2326 (%b) The last part indicates the size of the object returned to the client, not including the response headers. If no content was returned to the client, this value will be "-". To log "0" for no content, use %B instead.

同一个文件应该有这么大的差别吗？或者，这与浏览器caching有关吗？

 root@web:/var/log/apache2/vhost# cat VHOST_USERNAME_USERNAME.sinners.be.log | grep -i bol IP_USER - - [09/Sep/2014:17:18:34 +0200] "GET /SUBFOLDER/application/img/Hondenbol200.png HTTP/1.1" 404 544 "http://USERNAME.sinners.be/SUBFOLDER/index.php" "Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.44 Safari/537.36" IP_USER - - [09/Sep/2014:17:20:29 +0200] "GET /SUBFOLDER/application/img/Hondenbol200.png HTTP/1.1" 404 544 "http://USERNAME.sinners.be/SUBFOLDER/index.php" "Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.44 Safari/537.36" IP_USER - - [09/Sep/2014:17:43:45 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 200 222132 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.44 Safari/537.36" IP_USER - - [10/Sep/2014:17:13:05 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 200 222131 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.103 Safari/537.36" IP_ME - - [20/Sep/2014:13:50:38 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 200 222130 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:13:53:23 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 304 182 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:13:53:41 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 200 222131 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_USER - - [20/Sep/2014:13:53:39 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 200 222131 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.66 Safari/537.36" IP_USER - - [20/Sep/2014:13:53:38 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 200 222131 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.66 Safari/537.36" RANDOM_IP - - [20/Sep/2014:13:55:17 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.0" 200 222094 "-" "-" IP_ME - - [20/Sep/2014:13:56:14 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 304 183 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_ME - - [20/Sep/2014:13:56:15 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 304 182 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_ME - - [20/Sep/2014:13:56:15 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 304 182 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_ME - - [20/Sep/2014:13:56:15 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 304 182 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_USER - - [20/Sep/2014:13:53:39 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 200 222131 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.66 Safari/537.36" IP_ME - - [20/Sep/2014:13:59:58 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 304 182 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:14:01:04 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 200 222131 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:14:01:38 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 200 222131 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_USER - - [20/Sep/2014:14:02:39 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 200 222130 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.66 Safari/537.36" IP_USER - - [20/Sep/2014:14:03:17 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 304 183 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.66 Safari/537.36"

文件：

 -rwxr-xr-x 1 USERNAME user 221841 Sep 10 01:22 Hondenbol.png

 root@web:~# uname -a Linux web 3.14-2-amd64 #1 SMP Debian 3.14.15-2 (2014-08-09) x86_64 GNU/Linux root@web:~# apache2 -v Server version: Apache/2.4.10 (Debian) Server built: Jul 23 2014 13:15:48 root@web:~# php -v PHP 5.6.0-1 (cli) (built: Aug 28 2014 13:03:02) Copyright (c) 1997-2014 The PHP Group Zend Engine v2.6.0, Copyright (c) 1998-2014 Zend Technologies with Zend OPcache v7.0.4-dev, Copyright (c) 1999-2014, by Zend Technologies

我们使用mpm-itk 。

更新1

谢谢，@ kasperd。我在日志文件中添加了%D ，并find了一个同样问题的同事。我问他几次（完全）加载有问题的网站。

澄清; 页面本身加载正常。这只是页面上的图像，对于一些人来说是很麻烦的，但是它们总是一样的图像。

logging同事的访问：

 IP_OTHER_GUY - - [20/Sep/2014:21:18:38 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 206 339 2602 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_OTHER_GUY - - [20/Sep/2014:21:18:38 +0200] "GET /SUBFOLDER/application/img/banner.jpg HTTP/1.1" 206 341 11028 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_OTHER_GUY - - [20/Sep/2014:21:18:38 +0200] "GET /SUBFOLDER/application/css/afbeeldingen/template/pattern.png HTTP/1.1" 404 561 984 "http://USERNAME.sinners.be/SUBFOLDER/application/css/style.css" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_OTHER_GUY - - [20/Sep/2014:21:18:38 +0200] "GET /SUBFOLDER/application/img/banner.jpg HTTP/1.1" 206 252546 33461847 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_OTHER_GUY - - [20/Sep/2014:21:18:38 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 206 184858 61415214 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_OTHER_GUY - - [20/Sep/2014:21:33:29 +0200] "GET /SUBFOLDER/ HTTP/1.1" 200 1078 30539 "http://l.facebook.com/lsr.php?u=http%3A%2F%2FUSERNAME.sinners.be%2FSUBFOLDER%2F&ext=1411241671&hash=" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_OTHER_GUY - - [20/Sep/2014:21:33:29 +0200] "GET /SUBFOLDER/application/css/afbeeldingen/template/pattern.png HTTP/1.1" 404 561 864 "http://USERNAME.sinners.be/SUBFOLDER/application/css/style.css" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_OTHER_GUY - - [20/Sep/2014:21:33:39 +0200] "GET /SUBFOLDER/ HTTP/1.1" 200 1078 30241 "http://l.facebook.com/lsr.php?u=http%3A%2F%2FUSERNAME.sinners.be%2FSUBFOLDER%2F&ext=1411241671&hash=" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_OTHER_GUY - - [20/Sep/2014:21:33:39 +0200] "GET /SUBFOLDER/application/css/style.css HTTP/1.1" 200 1304 2659 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_OTHER_GUY - - [20/Sep/2014:21:33:39 +0200] "GET /SUBFOLDER/application/css/afbeeldingen/template/pattern.png HTTP/1.1" 404 561 506 "http://USERNAME.sinners.be/SUBFOLDER/application/css/style.css" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_OTHER_GUY - - [20/Sep/2014:21:34:04 +0200] "GET /SUBFOLDER/ HTTP/1.1" 200 1078 50469 "http://l.facebook.com/lsr.php?u=http%3A%2F%2FUSERNAME.sinners.be%2FSUBFOLDER%2F&ext=1411241671&hash=" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_OTHER_GUY - - [20/Sep/2014:21:34:04 +0200] "GET /SUBFOLDER/application/css/style.css HTTP/1.1" 200 1304 1663 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_OTHER_GUY - - [20/Sep/2014:21:34:04 +0200] "GET /SUBFOLDER/application/css/afbeeldingen/template/pattern.png HTTP/1.1" 404 562 8751 "http://USERNAME.sinners.be/SUBFOLDER/application/css/style.css" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_OTHER_GUY - - [20/Sep/2014:21:34:04 +0200] "GET /SUBFOLDER/application/img/banner.jpg HTTP/1.1" 200 310256 48043620 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_OTHER_GUY - - [20/Sep/2014:21:34:04 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 200 222130 61975581 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_OTHER_GUY - - [20/Sep/2014:21:35:07 +0200] "GET /favicon.ico HTTP/1.1" 404 506 2452 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_OTHER_GUY - - [20/Sep/2014:21:36:08 +0200] "GET /SUBFOLDER/ HTTP/1.1" 200 1078 33676 "http://l.facebook.com/lsr.php?u=http%3A%2F%2FUSERNAME.sinners.be%2FSUBFOLDER%2F&ext=1411241671&hash=" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_OTHER_GUY - - [20/Sep/2014:21:36:08 +0200] "GET /SUBFOLDER/application/css/style.css HTTP/1.1" 200 1304 3005 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_OTHER_GUY - - [20/Sep/2014:21:36:08 +0200] "GET /SUBFOLDER/application/css/afbeeldingen/template/pattern.png HTTP/1.1" 404 562 8426 "http://USERNAME.sinners.be/SUBFOLDER/application/css/style.css" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36" IP_OTHER_GUY - - [20/Sep/2014:21:36:08 +0200] "GET /SUBFOLDER/application/img/banner.jpg HTTP/1.1" 200 310256 60066766 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36"

logging我的访问：

 IP_ME - - [20/Sep/2014:21:32:59 +0200] "GET /SUBFOLDER/ HTTP/1.1" 200 1078 55236 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:32:59 +0200] "GET /SUBFOLDER/application/css/afbeeldingen/template/pattern.png HTTP/1.1" 404 561 1154 "http://USERNAME.sinners.be/SUBFOLDER/application/css/style.css" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:32:59 +0200] "GET /favicon.ico HTTP/1.1" 404 506 216 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:32:59 +0200] "GET /favicon.ico HTTP/1.1" 404 506 183 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:16 +0200] "GET /SUBFOLDER/ HTTP/1.1" 200 1078 51083 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:16 +0200] "GET /SUBFOLDER/application/css/style.css HTTP/1.1" 200 1304 2006 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:16 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 304 182 774 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:16 +0200] "GET /SUBFOLDER/application/css/afbeeldingen/template/pattern.png HTTP/1.1" 404 561 717 "http://USERNAME.sinners.be/SUBFOLDER/application/css/style.css" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:16 +0200] "GET /SUBFOLDER/application/img/banner.jpg HTTP/1.1" 304 183 9232 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:16 +0200] "GET /SUBFOLDER/ HTTP/1.1" 200 1077 9386 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:17 +0200] "GET /SUBFOLDER/application/css/style.css HTTP/1.1" 200 1304 657 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:17 +0200] "GET /SUBFOLDER/application/img/banner.jpg HTTP/1.1" 304 182 488 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:17 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 304 183 8270 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:17 +0200] "GET /SUBFOLDER/application/css/afbeeldingen/template/pattern.png HTTP/1.1" 404 561 392 "http://USERNAME.sinners.be/SUBFOLDER/application/css/style.css" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:17 +0200] "GET /SUBFOLDER/ HTTP/1.1" 200 1077 9150 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:17 +0200] "GET /SUBFOLDER/application/css/style.css HTTP/1.1" 200 1304 1028 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:17 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 304 182 777 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:17 +0200] "GET /SUBFOLDER/application/img/banner.jpg HTTP/1.1" 304 182 487 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:17 +0200] "GET /SUBFOLDER/application/css/afbeeldingen/template/pattern.png HTTP/1.1" 404 561 340 "http://USERNAME.sinners.be/SUBFOLDER/application/css/style.css" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:18 +0200] "GET /SUBFOLDER/ HTTP/1.1" 200 1077 8646 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:18 +0200] "GET /SUBFOLDER/application/css/style.css HTTP/1.1" 200 1304 746 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:18 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 304 182 287 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:18 +0200] "GET /SUBFOLDER/application/img/banner.jpg HTTP/1.1" 304 182 699 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:18 +0200] "GET /SUBFOLDER/application/css/afbeeldingen/template/pattern.png HTTP/1.1" 404 561 311 "http://USERNAME.sinners.be/SUBFOLDER/application/css/style.css" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:18 +0200] "GET /SUBFOLDER/ HTTP/1.1" 200 1077 7981 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:18 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 304 182 349 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:18 +0200] "GET /SUBFOLDER/application/img/banner.jpg HTTP/1.1" 304 182 238 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:18 +0200] "GET /SUBFOLDER/application/css/style.css HTTP/1.1" 200 1304 2150 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:18 +0200] "GET /SUBFOLDER/application/css/afbeeldingen/template/pattern.png HTTP/1.1" 404 561 291 "http://USERNAME.sinners.be/SUBFOLDER/application/css/style.css" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:19 +0200] "GET /SUBFOLDER/ HTTP/1.1" 200 1077 22099 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:19 +0200] "GET /SUBFOLDER/application/css/style.css HTTP/1.1" 200 1304 822 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:19 +0200] "GET /SUBFOLDER/application/img/Hondenbol.png HTTP/1.1" 304 182 345 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:19 +0200] "GET /SUBFOLDER/application/img/banner.jpg HTTP/1.1" 304 182 217 "http://USERNAME.sinners.be/SUBFOLDER/" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0" IP_ME - - [20/Sep/2014:21:37:19 +0200] "GET /SUBFOLDER/application/css/afbeeldingen/template/pattern.png HTTP/1.1" 404 561 265 "http://USERNAME.sinners.be/SUBFOLDER/application/css/style.css" "Mozilla/5.0 (X11; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0"

正如你所看到的，我访问的加载/处理时间要低得多。
所有有此问题的人似乎都有Telenet作为他们的互联网服务提供商。有Belgacom（这是唯一的其他select）的人似乎没有这个问题。虽然这可能是巧合。这只是我注意到的东西; 我不确定这是否可以相关。

更新2

供参考，一个testing页面; http://robinj1995.sinners.be/test/index_en.php

第一个字段（块）是最相关的一个在这里。

更新3

我们尝试使用非Apache Web服务器（GitLab的Unicorn），并遇到同样的问题。这似乎是问题与networking/防火墙问题有关，而不是我们的Apacheconfiguration的问题。

我们的防火墙和/或垫脚石是使用iptables运行Debian stable的服务器。

状态码304意味着caching副本仍然是最新的，没有数据发送到客户端。您将看到，状态码为304所有请求的字节数都很小，而状态码为200所有请求的字节数都很小。

但是，如果你有一个不错的连接速度，传输200KB的静态数据应该只需要几分之一秒。所以这可能不是你正在寻找的瓶颈。

为了debuggingApache性能问题，我发现在LogFormat包含%D是很有用的。这将告诉你处理请求需要多less微秒。

这里有几个variables（不同的浏览器，源IP地址），但这些都是你的Web服务器的外部。如果你已经看到了基于用户的ISP的模式，那么试着拿出一些量化的指标。例如，您可以跟踪networking时间从浏览器加载图像。

例如，在Chrome（开发人员工具，单击“networking选项卡”）中，可以通过URL加载图像，并跟踪请求大小，HTTP方法，HTTP状态和总networking延迟。请注意，您可以切换“禁用caching”checkbox以查看caching的影响 – 您的IP_ME请求大部分是304（caching），而IP_OTHER是200（未caching）。

尝试使用您自己的Hondenbol.jpg URL进行testing（caching/未caching）。然后也尝试从一个不相关的服务器上加载一个中性的图像（我用任意一个进行了testing， http：//telefonica.cl/images/new-home/banners/banner-tripack-moviecity.jpg ，位于智利的某个地方）。

通过这个testing，你应该能够确认是否a）它只是caching，或者b）延迟是在你的web服务器之外的，并且和用户的ISP有关。

如果您查看有问题的客户端的日志文件，则会看到重复的HTTP 206响应代码。

当客户端请求部分下载资源时，您会看到一个206响应，这可能是由于各种原因而产生的，例如之前已经下载了一些资源，它认识到这是一个大的二进制文件，或者尝试某种带宽控制。

在出现HTTP 304响应的地方，这意味着客户端只有在该资源上的caching未过期时才请求该资源。如果caching未过期，则服务器不发送任何数据; 它只是告诉客户端可以从客户端caching中加载文件，因为它在服务器上没有改变。

因此，这些响应将始终呈现内容，因为资源正在本地加载。

如果共享日志中的模式是典型的，那么这个问题是由浏览器对部分内容重复请求引起的，并且经过多次尝试才得到全部内容。

这可能是与代理，浏览器configuration或只是networking延迟。如果您可以提供到其中一个图像文件的实时链接，则可以进行更多的debugging。

是否尝试做一个DNS查找和超时？

虽然通过浏览器下载HTTP和通过FTP客户端FTP下载从一些特定的互联网服务提供商（ISP）是可怕的，通过curl / wget和FTP上传HTTP下载绝对好。

最后我们通过更换防火墙来修复它。我们认为它可能有一个错误的networking接口卡（NIC），因为它的第二个NIC已经坏了，当我们得到它（二手服务器）。

我们可能会看看后来到底是什么问题，在这种情况下，我会更新这个答案，以提供更多的细节。