Bug 1098415 - Skip DNS prefetch requests that point to local resources. r=sworkman r=dragana

dom/base/nsContentSink.cpp

@@ -852,10 +852,16 @@ nsContentSink::PrefetchDNS(const nsAString &aHref)
     if (!uri) {
       return;
     }
+    nsresult rv;
+    bool isLocalResource = false;
+    rv = NS_URIChainHasFlags(uri, nsIProtocolHandler::URI_IS_LOCAL_RESOURCE,
+                             &isLocalResource);
+    if (NS_SUCCEEDED(rv) && !isLocalResource) {
       nsAutoCString host;
       uri->GetHost(host);
       CopyUTF8toUTF16(host, hostname);
     }
+  }
 
   if (!hostname.IsEmpty() && nsHTMLDNSPrefetch::IsAllowed(mDocument)) {
     nsHTMLDNSPrefetch::PrefetchLow(hostname);