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我正在开发一个网络应用程序，我试图在其中使用 HTML5 应用程序缓存。

我可以在线成功缓存文件并从 AppCache 加载文件。但是当我离线时，所有的 css 和 js 文件都使用 MIME 类型 text/html 而不是 application/x-javascript 或 text/css 传输，因此它无法在离线时正常工作。

这是我在离线时请求页面时得到的。

Application Cache Error event: Manifest fetch failed (-1) https://example.com/manifest
Resource interpreted as Stylesheet but transferred with MIME type text/html: "https://example.com/offline_assets/stylesheets/cache/offline_all.css".
Resource interpreted as Script but transferred with MIME type text/html: "https://example.com/javascripts/offline/respond.min.js".
Resource interpreted as Script but transferred with MIME type text/html: "https://example.com/javascripts/yui3/3.1.1/build/yui/yui-min.js".
Resource interpreted as Script but transferred with MIME type text/html: "https://example.com/offline_assets/sprockets.js".

因此，页面没有设置样式并出现各种 JS 错误。

如何正确设置，以便在离线时使用正确的 MIME 类型从 appcache 传输 css 和 js 文件？谢谢你的建议

更新：这就是我在服务器上提供清单文件的方式

class ManifestController < ApplicationController

  def show
    headers['Content-Type'] = 'text/cache-manifest'
    render :text => File.open("#{RAILS_ROOT}/public/manifest.appcache").read, :layout => false
  end
end

我已经通过了这个验证测试： http: //manifest-validator.com/

这是我的清单文件：

CACHE MANIFEST
#<
/offline_assets/stylesheets/cache/offline_all.css
/offline_assets/fonts/websymbols-regular-webfont.woff
/offline_assets/javascripts/yui3/3.1.1/build/yui/yui-min.js
/offline_assets/sprockets.js
/offline_assets/javascripts/offline/respond.min.js
/offline_assets/images/logoClio.png
/offline_assets/images/search/icoSearch.png
/offline_assets/images/icoArrow-down.png
/offline_assets/images/gold/submenu_current.png
/offline_assets/images/calendar/left_arrow.gif
/offline_assets/images/calendar/right_arrow.gif
/offline_assets/images/calendar/left_arrow_on.gif
/offline_assets/images/calendar/right_arrow_on.gif
/offline_assets/images/calendar-lg.gif
/offline_assets/images/logo-tagline.gif
/offline_assets/images/icoRecent-matter.png
/offline_assets/images/icoRecent-contact.png
/offline_assets/stylesheets/yui/dt-arrow-dn.png
/offline_assets/stylesheets/cache/sprite.png
/offline_assets/images/timer_stop.png
/offline_assets/images/add3.png
/offline_assets/images/arrow_down.gif
/offline_assets/images/spinner.gif
/offline_assets/images/timer_start.png
/offline_assets/images/delete.png
/offline_assets/images/offline/logoClio.png
/offline_assets/images/offline/bgSteps-1.png
/offline_assets/images/offline/bgSteps-2.png
/offline_assets/images/offline/bgSteps-3.png
/offline_assets/images/offline/icoReload.png
/offline_assets/images/offline/dt-arrow-dn.png
/offline_assets/images/offline/sprite.png
#>

# offline.html will be displayed if the user is offline and attempt to get uncached pages
FALLBACK:
/ /offline.html

# All other resources (e.g. sites) require the user to be online. 
NETWORK:
*

这是在 chrome://appcache-internals/ 上显示 MIME 类型和其他详细信息的缓存文件之一

https://staging.goclio.com/offline_assets/sprockets.js?cec750eb3581f3d9f78c97d0ad8331df
HTTP/1.1 200 OK
Server: nginx/0.8.55
Date: Fri, 09 Mar 2012 19:56:17 GMT
Content-Type: application/x-javascript
Last-Modified: Fri, 09 Mar 2012 19:51:10 GMT
Expires: Thu, 31 Dec 2037 23:55:55 GMT
Cache-Control: max-age=315360000
X-Backend-Server: 333963-web02.rs.goclio.com:81
Accept-Ranges: bytes
Vary: Accept-Encoding, User-Agent
Content-Encoding: gzip

另一个更新：这在 Firefox 上运行良好，不会出现任何 MIME 类型错误。直也

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1 回答 1

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这实际上不是 MIME 类型的问题。它给了我 text/html 内容类型错误，因为它返回了我请求非缓存文件时返回的 offline.html。问题是我添加了 MD5 哈希作为每个文件的参数。所以清单看起来像这样。

CACHE MANIFEST
/offline_assets/stylesheets/cache/offline_all.css?someMD5hash
/offline_assets/javascripts/yui3/3.1.1/build/yui/yui-min.jsf?anotherMD5hash
#and may more files with MD5 hash

FALLBACK:
/ /offline.html

NETWORK:
*

当它在离线时请求内容时，它无法找到合适的文件，因为缓存的文件名包含 MD5 哈希作为参数。所以我通过将 MD5 哈希作为注释来解决它。

于 2012-03-12T23:17:33.427 回答