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Editorial Team
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Asked: 2026-05-18T04:05:11+00:00

I’ve written a basic password manager type web application to run offline on a

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I’ve written a basic password manager type web application to run offline on a mobile device (testing on a 4th gen iPod Touch). I’ve added the app to the Home Screen and it all works fine while the iPod is online and can reach the server. Once I put the iPod offline, when I open the app the following dialog comes up:

Cannot Open PwdThing

PwdThing could not be opened because it is not connected to the Internet

The single static HTML file for the app (passwordthing.html) points to the manifest file:

<html manifest="cache.manifest">
...

The cache.manifest file includes all the files used by the app (including the jQuery Mobile files):

CACHE MANIFEST
passwordthing.html
passwordthing.js
...

And the cache.manifest file is set up to be served as text/cache-manifest in the .htaccess file:

AddType text/cache-manifest .manifest

All the source files are on Github (this commit is the version at the time of writing) and I have set up a public server to install it from as well.

Why can’t I get my app to work offline?

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1 Answer

  1. Editorial Team

    The only thing I can think of is that you have not changed the file, and mobile safari has cached an old version of the manifest. add a comment to your manifest. You might also want to try changing the name of the manifest file itself; I have had to do that to get my IPad to cache — everytime I update my application I change the name of the manifest to include the date.

    Note that iOS4.2 has much better manifest support. You might see things improve when it is out.

    Edit — Or, as it turns out, its just a bad file name. 😉 (see comments on question).

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