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I'm trying to get HTML5 offline storage working in a basic way. I read the information on DiveIntoHTML5 and it seems to make sense, but it just doesn't seem to be working for me. I wondered if someone could help me to debug this.
Basically I've set up a home page for the application, index.htm. So my application is on the web at http://www.mydomain.com/online/index.htm. Users will visit this page, where they'll ordinaraily do all of their stuff day-to-day. Visiting this URL will create a bunch of cached files so they can then visit http://www.mydomain.com/offline and view a working version of the application when they're offline.
The top few lines of code in the online homepage are:
<!DOCTYPE html>
<html manifest="cache.manifest">
<head>
...etc
I've generated a plain text file called 'cache.txt' and added the following content to it in Notepad:
CACHE MANIFEST
http://www.mydomain.com/offline/scripts/jquery-1.6.3.min.js
http://www.mydomain.com/offline/scripts/jquery-ui-1.8.16.custom.min.js
http://www.mydomain.com/offline/scripts/modernizr.min.js
http://www.mydomain.com/offline/scripts/json2.min.js
http://www.mydomain.com/offline/scripts/jquery.deserialize.js
http://www.mydomain.com/offline/scripts/jquery.cookie.js
http://www.mydomain.com/offline/scripts/main.js
http://www.mydomain.com/offline/css/main.css
http://www.mydomain.com/offline/css/structure-details.css
http://www.mydomain.com/offline/css/ui-lightness/jquery-ui-1.8.16.custom.css
http://www.mydomain.com/img/header.gif
http://www.mydomain.com/offline/img/bg.png
http://www.mydomain.com/offline/img/header_riser.gif
http://www.mydomain.com/offline/img/logo.png
http://www.mydomain.com/offline/img/offline.png
http://www.mydomain.com/offline/index.htm
I've then renamed this file to 'cache.manifest' and uploaded it to the root of the online application (at the same level as my home-page) so that it's accessible at http://www.mydomain.com/online/cache.manifest.
The hosting company have supposedly added the content type of 'text/cache-manifest' to all files with the extension of .manifest in IIS. I think this is working because when I view the file in Firefox at http://www.mydomain.com/online/cache.manifest Firebug tells me the content type is:
Content-Type cache-manifest
Or should this be returning 'text/cache-manifest'? Perhaps this is the problem?
When I view the offline storage folder on my system (C:\Users\Me\AppData\Local\Mozilla\Firefox\Profiles\b12u6xza.default there's nothing in there related to this domain at all.
Can anyone suggest what might be going wrong - as I'm a little stumped?
305
The Manifest File NETWORK - Files listed under this header require a connection to the server, and will never be cached. FALLBACK - Files listed under this header specifies fallback pages if a page is inaccessible.
The manifest attribute of the <html> element specifies a URL of an application cache manifest that is downloaded in the early stages of page load. Note: manifest-based caching mechanism has been deprecated. Use service workers instead.
The CACHE section contains files you want to load and store on the user's machine. The first time the user loads your app, the browser will store all the files in the CACHE section of your app cache manifest. The NETWORK section contains all the resources that require a network connection to be loaded.
First of all, the specification have changed, you should now use .appcache as manifest extension.
Second, the mime type should be defined as you say text/cache-manifest. I'm not really related to IIS but seems like there's two ways to add this MIME type , either trough IIS administration UI or via web.config file
Also, I would recommend you testing this with Google Chrome, since its console show all the manifest parsing data and errors, including when the manifest MIME type is not being correctly recognized.
130
There are some issues you have to be care about:
If I find more issues, I'll write it down.
Regards.
43
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