Unable to fetch iOS webapp files on manifest update. 401 unauthorized

By | July 12, 2018

I have a HTML5 webapp which is running perfectly when served via the IIS without authentication.

Is is using a cache.manifest file.

Both when running in safari, and as an “add to homescreen” fullscreen app, once I update the manifest file on the server, and the app will update.

When I turn on authentication on all files except the cache.manifest, then I only see the update when running it in the safari browser.

If I add it to the homescreen, I am not able to make the app update the cache.

If I wireshark the traffic on the server, I can see the manifest file is fetched without problems, but all the files in the manifest file hits a 401 Unautorized error.

Any idea how I can fix this? Running it in the safari browser is working..

Any help is highly appreciated.


Safari is much more aware of HTTP Basic Auth, but web.app (the home screen web app handler, which is basically a UIWebView wrapper) isn’t as full-featured and doesn’t appear to support basic auth.

It seems you may need to work around this with either a server-side solution to append an authentication key to the filename (such as application.css?longhexkey) to bypass basic auth, or go with a more traditional login form (which may require significant changes to your app)

Same issue on Sencha forums: Unanswered: Forcing re-authentication after offline usage on iOS devices?

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