From 16c0d802860410233fecd6644ae3109cc5bf8b27 Mon Sep 17 00:00:00 2001
From: Francois Marier <francois@mozilla.com>
Date: Tue, 27 Sep 2016 13:25:35 -0700
Subject: [PATCH] Bug 1302938 - Explain why user referrer trimming policy can
 be overriden. r=dragana

MozReview-Commit-ID: GfmeIu2WEGX

--HG--
extra : rebase_source : 386c056f51dd351e7713806cec2292f5a226e8ef
---
 netwerk/protocol/http/HttpBaseChannel.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/netwerk/protocol/http/HttpBaseChannel.cpp b/netwerk/protocol/http/HttpBaseChannel.cpp
index c40c74d7ec7d..22ca752e4175 100644
--- a/netwerk/protocol/http/HttpBaseChannel.cpp
+++ b/netwerk/protocol/http/HttpBaseChannel.cpp
@@ -1522,6 +1522,9 @@ HttpBaseChannel::SetReferrerWithPolicy(nsIURI *referrer,
       referrerPolicy == REFERRER_POLICY_STRICT_ORIGIN ||
       (isCrossOrigin && (referrerPolicy == REFERRER_POLICY_ORIGIN_WHEN_XORIGIN ||
                          referrerPolicy == REFERRER_POLICY_STRICT_ORIGIN_WHEN_XORIGIN))) {
+    // We can override the user trimming preference because "origin"
+    // (network.http.referer.trimmingPolicy = 2) is the strictest
+    // trimming policy that users can specify.
     userReferrerTrimmingPolicy = 2;
   }