Mobile Safari 5mb HTML5 application cache limit?

Question

It's becoming evident in my testing that there's a 5mb size limit on Mobile Safari's implementation of HTML5's application cache.

Does anyone know how to circumvent or raise this? Is there some unexposed meta tag that I should know about? I have to cache some video content for an offline app and 5mb is not going to be enough.

Answer 1

I tried to write a simple test with this manifest:

CACHE MANIFEST
# 2010-06-20:v4

http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js
http://peach.blender.org/wp-content/uploads/big_big_buck_bunny.jpg
http://apod.nasa.gov/apod/image/9712/orionfull_jcc_big.jpg
http://www.thelivingmoon.com/43ancients/04images/Titan/titan5km_huygens_big.jpg
http://upload.yeuamnhac.com/musica/dan_lily/dancontent/rh108poster1big.jpg

This cache will need 11.4MB of storage.

When I open a page include that manifest file, it say something like that: "This website require to use up to 25MB of storage, do you want to increase local storage?".

I think I got what the way iOS do:

• You only have 5MB for local storage (include HTML5 application cache)
• If your web need more, Safari need user's agreement for some packages (up to 10MB, or 25MB, or more...)

Hope that useful for you.

Answer 2

This won't apply to the particular offline-video use case, but you can create Web SQL databases larger than the default 5MB in iOS by simply requesting a larger DB in the openDatabase call. For some kinds of storage, SQLite can be an acceptable solution.

Answer 3

Also contacted apple about this.

Read my blogpost about this here: http://techblog.viewbook.com/2011/02/mobile-safari-offline-application-cache-limit/

And my StackOverflow post here: Max size iPad / iPhone Offline Application Cache