[whatwg] AppCache-related e-mails

Ian Hickson ian at hixie.ch
Tue Aug 2 16:40:40 PDT 2011

On Tue, 2 Aug 2011, Michael Nordman wrote:
> >>
> >> A common request that maybe we can agree upon is the ability to list the
> >> manifests that are cached and to delete them via script. Something
> >> like...
> >>   String[] window.applicationCache.getManifests();  // returns appcache
> >> manifest for the origin
> >>   void window.applicationCache.deleteManifest(manifestUrl);
> >
> > This is trivial to do already; just return 404s for all the manifests 
> > you no longer want to keep around.
> It involves creating hidden iframes loaded with pages that refer to the 
> manifests to be deleted, straightforward but gunky.

If you actively want to seek out old manifests, sure, but what's the use 
case for doing that? It would be like trying to actively evict things from 
HTTP caches.

> >> 0. [DONE] A means of not invoking the fallback resource for some error
> >> responses that would generally result in the fallback resource being
> >> returned. An additional response header would suite they're needs...
> >> something like...
> >> x-chromium-appcache-fallback-override: disallow-fallback
> >> If a response header is present with that value, the fallback response
> >> would not be returned. 
> >> http://code.google.com/p/chromium/issues/detail?id=82066
> >
> > What's the use case? When would you ever want to show the user an 
> > error yet really desire to indicate that it's an error and not a 200 
> > OK response?
> Google Docs. Instead of seeing a fallback page that erroneously says 
> "You must be offline and this document is not available.", they wanted 
> to show the actual error page generated by the server in the case of a 
> deleted document or when the user doesn't have rights to access that 
> doc.

I don't see what's wrong with using 200 OK for that case.

Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'

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