[whatwg] Fwd: fallback section taking over for 4xx and 5xx responses while online

Ian Hickson ian at hixie.ch
Mon Dec 17 13:30:06 PST 2012

On Tue, 11 Dec 2012, David Barrett-Kahn wrote:
> We ran into this same problem on Google Docs offline.  Our solution was 
> to add a proprietary response header to Chrome which instructs the 
> browser that the response is not to trigger the fallback entry, despite 
> its response code.  Something like it could be considered for 
> standardization. I know there are some people on the Chrome team looking 
> to advance some new appcache features, and that this use case is on 
> their list.

Can you elaborate on the need for this feature? Why would you ever send 
the user to a 404 page intentionally (i.e. when the server isn't broken)? 
Similarly, why would you not consider the server returning 500 a good 
indication that the cache should be used?

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

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