Chrome App webview & AppCache vs Chrome Tab & AppCache

[Mac Pham]

Does anyone know what governs the AppCache limit for a webview in a Chrome App?

My Chrome App has the unlimitedStorage option but it still is not able to cache files larger than a 1 MB while running on Chrome OS.

Meanwhile on Chrome OS, if I open a regular Chrome tab and go to the same URL that I am giving to my webview, the AppCache successfully caches everything.

[Fady Samuel]

+hanxi@: Xi, you made some file system changes in <webview> last year. Do you remember? You need an unlimitedStorage permission in the manifest if I remember correctly? Thanks!

Fady

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[Mac Pham]

Thanks so much for the reply Fady.

I have the unlimitedStorage permission in my manifest oddly.

I ran this test www.der-schepp.de/appcache-default-size/ inside my webview and I noted that it went up to 40MB fine the Chrome-OS based machine I was using however, it was just adding an additional 1MB file at a time I believe. I am suspecting there is some other limit that is preventing an individual file from being over a certain size in the AppCache, not just the total size of the AppCache. The error I'm seeing in the console is:

Application Cache Error event: Resource fetch failed (2) <myfile>

[Mac Pham]

A bit of a cross-post but this was my original question: https://groups.google.com/a/chromium.org/forum/?hl=en#!topic/chromium-html5/L73SPA4ktmg however it ended up unanswered for a month so I thought I would post here.

On Tuesday, October 13, 2015 at 3:09:32 PM UTC-4, Fady Samuel wrote:

[Mac Pham]

Hi Xi,

I didn't set the partition. Is that required for my usage? I do not have multiple webviews. I just have one where I am loading my HTML5 app.

I thought not to because from the documentation here: https://developer.chrome.com/apps/tags/webview I was under the impression it was not needed for my use case.

Thanks,

Mac

On Tue, Oct 13, 2015 at 3:42 PM Xi Han <ha...@google.com> wrote:

Sorry, I don't know why I missed your first emails.

Yes, you need to add "unlimitedStorage" permission in the manifest file. Did you set partition = "persist:XXX"for the webview tag?

Regards,

Xi

[Mac Pham]

Oh. Thanks so much, I will give this a try.

On Tue, Oct 13, 2015 at 3:58 PM Xi Han <ha...@google.com> wrote:

Hi Mac,

yes, only when you set the partition of a webview as persistent, it will request quota for persistent storage.

In the manifest, add:

"webview": {
    "partitions": [
    {
      "name": "a"
    }
    ]
  },

When create the webview tag, try:

<webview id="foo" src="http://www.google.com/" style="width:640px; height:480px"  partition="persist:a"></webview>

Try to see whether it works.

Regards,

Xi

[Mac Pham]

For reference this worked.

I was missing the partition="persist:aaa" in my webview tag and then in the manifest, I had to declare:

  "webview": {

    "partitions": [

      {

        "name": "aaa",

        "accessible_resources": [""]

      }

    ]

  }