Avoid reusing XMLHttpRequest resources during document load.

Source/core/fetch/ResourceFetcher.cpp

Index: Source/core/fetch/ResourceFetcher.cpp
diff --git a/Source/core/fetch/ResourceFetcher.cpp b/Source/core/fetch/ResourceFetcher.cpp
index 651050f628e91525ac2c0356d49869f13ea22737..8eb42e0dc26e898611b9908fd322ecaa2dff25c4 100644
--- a/Source/core/fetch/ResourceFetcher.cpp
+++ b/Source/core/fetch/ResourceFetcher.cpp
@@ -860,6 +860,10 @@ ResourceFetcher::RevalidationPolicy ResourceFetcher::determineRevalidationPolicy
         return Reload;
     }
 
+    // For compatibility, reload existing resource with a Raw type (read: XHR.)
+    if (type == Resource::Raw)

[Nate Chapin, 2013/11/05 19:39:24]

We probably want a narrower fix than this. RawResource::canReuse() permits reuse
in a much narrower set of cases than other resources, but it's possible that
it's still too permissive. Regardless, the fix should probably go there.

Based on the test case you provided, perhaps canReuse() should check whether
either the existing or the new request have a url with a query?

+        return Reload;
+
     // During the initial load, avoid loading the same resource multiple times for a single document, even if the cache policies would tell us to.
     if (document() && !document()->loadEventFinished() && m_validatedURLs.contains(existingResource->url()))
         return Use;