添加Expires标头

Question

Add Expires headers
There are 21 static components without a far-future expiration date.

    http://static.doers.lk/examples-offline.css
    http://static.doers.lk/kendo.common.min.css
    http://static.doers.lk/kendo.default.min.css
    http://static.doers.lk/style.css
    http://static.doers.lk/jquery.min.js
    http://static.doers.lk/kendo.web.min.js
    http://static.doers.lk/console.js
    http://static.doers.lk/sprite.png
    https://fbexternal-a.akamaihd.net/safe_image.php?...
    https://fbexternal-a.akamaihd.net/safe_image.php?...
    https://fbexternal-a.akamaihd.net/safe_image.php?...
    https://fbexternal-a.akamaihd.net/safe_image.php?...
    https://fbexternal-a.akamaihd.net/safe_image.php?...
    https://fbexternal-a.akamaihd.net/safe_image.php?...
    https://fbexternal-a.akamaihd.net/safe_image.php?...
    https://fbexternal-a.akamaihd.net/safe_image.php?...
    https://fbexternal-a.akamaihd.net/safe_image.php?...
    https://fbexternal-a.akamaihd.net/safe_image.php?...
    https://fbexternal-a.akamaihd.net/safe_image.php?...
    https://fbexternal-a.akamaihd.net/safe_image.php?...
    http://static.doers.lk/favicon.PNG

当使用yahoo YSLOW测试网站时，它会说上面的消息。所以我不知道如何添加Expire头。如有任何帮助，我将不胜感激。

Answer 1

添加这些头文件的最简单方法是一个.htaccess文件，该文件向您的服务器添加一些配置。如果资产托管在您无法控制的服务器上，那么您对此无能为力。

请注意，一些主机提供商将不允许您使用.htaccess文件，因此，如果他们的条款似乎不起作用，请检查他们。

HTML5Boilerplate项目有一个出色的.htaccess文件，它涵盖了必要的设置。在其Github repository上查看文件的相关部分

这些是重要的部分

# ----------------------------------------------------------------------
# Expires headers (for better cache control)
# ----------------------------------------------------------------------

# These are pretty far-future expires headers.
# They assume you control versioning with filename-based cache busting
# Additionally, consider that outdated proxies may miscache
# www.stevesouders.com/blog/2008/08/23/revving-filenames-dont-use-querystring/

# If you don't use filenames to version, lower the CSS and JS to something like
# "access plus 1 week".

<IfModule mod_expires.c>
  ExpiresActive on

# Your document html
  ExpiresByType text/html "access plus 0 seconds"

# Media: images, video, audio
  ExpiresByType audio/ogg "access plus 1 month"
  ExpiresByType image/gif "access plus 1 month"
  ExpiresByType image/jpeg "access plus 1 month"
  ExpiresByType image/png "access plus 1 month"
  ExpiresByType video/mp4 "access plus 1 month"
  ExpiresByType video/ogg "access plus 1 month"
  ExpiresByType video/webm "access plus 1 month"

# CSS and JavaScript
  ExpiresByType application/javascript "access plus 1 year"
  ExpiresByType text/css "access plus 1 year"
</IfModule>

他们有documented what that file does，最重要的一点是，当你的CSS和Javascript文件改变时，你需要重命名，因为你的访问者的浏览器一年内都不会再检查它们，一旦它们被缓存。

Answer 2

试一下这个解决方案，它对我很有效。

## EXPIRES CACHING ##
<IfModule mod_expires.c>
ExpiresActive On
ExpiresByType image/jpg "access 1 year"
ExpiresByType image/jpeg "access 1 year"
ExpiresByType image/gif "access 1 year"
ExpiresByType image/png "access 1 year"
ExpiresByType text/css "access 1 month"
ExpiresByType text/html "access 1 month"
ExpiresByType application/pdf "access 1 month"
ExpiresByType text/x-javascript "access 1 month"
ExpiresByType text/css "access plus 1 year"
ExpiresByType application/x-shockwave-flash "access 1 month"
ExpiresByType image/x-icon "access 1 year"
ExpiresDefault "access 1 month"
</IfModule>

<IfModule mod_headers.c>
  <FilesMatch "\.(js|css|xml|gz)$">
    Header append Vary: Accept-Encoding
  </FilesMatch>
</IfModule>

<ifModule mod_gzip.c>
mod_gzip_on Yes
mod_gzip_dechunk Yes
mod_gzip_item_include file .(html?|txt|css|js|php|pl)$
mod_gzip_item_include handler ^cgi-script$
mod_gzip_item_include mime ^text/.*
mod_gzip_item_include mime ^application/x-javascript.*
mod_gzip_item_exclude mime ^image/.*
mod_gzip_item_exclude rspheader ^Content-Encoding:.*gzip.*
</ifModule>

<IfModule mod_deflate.c>
SetOutputFilter DEFLATE
AddOutputFilterByType DEFLATE text/html text/css text/plain text/xml text/x-js text/js 
</IfModule>

## EXPIRES CACHING ##

Answer 3

您可以将它们添加到htaccess文件或vhost配置中。

查看此处：http://httpd.apache.org/docs/2.2/mod/mod_expires.html

但是除非你拥有这些域名..他们是你的掌控者。