[Webkit-unassigned] [Bug 52153] New: Consider allowing resource revalidation and reloading after initial page load

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=52153

           Summary: Consider allowing resource revalidation and reloading
                    after initial page load
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Page Loading
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: koivisto at iki.fi
                CC: ap at webkit.org


This test in CachedResourceLoader::determineRevalidationPolicy()

// Avoid loading the same resource multiple times for a single document, even if the cache policies would tell us to.
if (m_validatedURLs.contains(existingResource->url()))
    return Use;

means that we never revalidate a resource for a given document (except if it has Cache-control:no-store which is handled separately), no matter how expired it is.

While we don't want to load a resource multiple times during a page load we should probably allow revalidation for resources that are requested by a script after the page load has completed. This might be achieved simply be clearing (and not adding to it afterwards) m_validatedURLs when the page load completes. It would also be good to figure out what exactly other browsers do here before making any changes.

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