[webkit-dev] WebKit caching

Adam Thorsen adam.thorsen at gmail.com
Sun Apr 12 09:15:19 PDT 2009

I removed the willSendRequest method and set the cache model and disk  
capacity ( without setting the memory capacity ) with the same  
results.  Is this enough information to file a bug report with or is  
there some more work I could do to track this down?

Thanks again,

On Apr 11, 2009, at 11:51 PM, Darin Adler wrote:

> On Apr 11, 2009, at 6:54 PM, Adam Thorsen wrote:
>> I also noticed recently that there is a "Disable Caches" option  
>> under the Develop menu on Safari.  I tested it using the same  
>> procedure and it indeed did not cache the javascript, so I know  
>> this is possible one way or another.
> It’s true, Disable Caches does this.
> In fact, I read over the implementation of that menu item before  
> answering your original question. All that Safari does when that  
> menu item is selected is:
>    [[WebPreferences standardPreferences]  
> setCacheModel:WebCacheModelDocumentViewer];
>    [[NSURLCache sharedURLCache] setDiskCapacity:0];
> I’m not sure why that works better in Safari than in your test  
> application.
>>        NSURL * url = [aRequest URL];
>>        NSURLRequest * cachelessRequest = [NSURLRequest  
>> requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData  
>> timeoutInterval:100];
>>        return cachelessRequest;
> This code in your willSendRequest delegate method may be causing a  
> problem. It discards the request and creates a new one, taking only  
> the URL from the original request. That’s a problem because there  
> are other important fields in the request, such as the HTTP method,  
> HTTP body, and HTTP header fields. If you want to change the cache  
> policy (and you should not need to do this, see my original  
> message), you would need code more like this:
>    if ([request cachePolicy] == NSURLRequestReloadIgnoringCacheData)
>        return request;
>    NSURLRequest *cachelessRequest = [aRequest mutableCopy];
>    [cachelessRequest  
> setCachePolicy:NSURLRequestReloadIgnoringCacheData];
>    return cachelessRequest;
> Hope that helps.
>    -- Darin

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