From c31d7cf9973ead1e76f04d81f455310142e8ec9f Mon Sep 17 00:00:00 2001
From: Jeff Lu <jll544@yahoo.com>
Date: Thu, 12 Mar 2015 09:00:00 +0100
Subject: [PATCH] Bug 1098415 - Skip DNS prefetch requests that point to local
 resources. r=sworkman r=dragana

---
 dom/base/nsContentSink.cpp | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/dom/base/nsContentSink.cpp b/dom/base/nsContentSink.cpp
index f486bf74d757..8ef3c075275a 100644
--- a/dom/base/nsContentSink.cpp
+++ b/dom/base/nsContentSink.cpp
@@ -852,9 +852,15 @@ nsContentSink::PrefetchDNS(const nsAString &aHref)
     if (!uri) {
       return;
     }
-    nsAutoCString host;
-    uri->GetHost(host);
-    CopyUTF8toUTF16(host, hostname);
+    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)) {