Add an opt-out header for HTTP throttling. Never throttle for localhost.

net/base/net_util_unittest.cc

Index: net/base/net_util_unittest.cc
diff --git a/net/base/net_util_unittest.cc b/net/base/net_util_unittest.cc
index 8f05c2049c2a374d36567612354d389640d960ff..1ce057a1be67a6d202b5fc0be255e03001365827 100644
--- a/net/base/net_util_unittest.cc
+++ b/net/base/net_util_unittest.cc
@@ -2167,6 +2167,34 @@ TEST(NetUtilTest, IPNumberMatchesPrefix) {
   }
 }
 
+TEST(NetUtilTest, IsLocalhost) {
+  EXPECT_TRUE(net::IsLocalhost("localhost"));
+  EXPECT_TRUE(net::IsLocalhost("localhost.localdomain"));
+  EXPECT_TRUE(net::IsLocalhost("localhost6"));
+  EXPECT_TRUE(net::IsLocalhost("localhost6.localdomain6"));
+  EXPECT_TRUE(net::IsLocalhost("127.0.0.1"));
+  EXPECT_TRUE(net::IsLocalhost("127.0.1.0"));
+  EXPECT_TRUE(net::IsLocalhost("127.1.0.0"));
+  EXPECT_TRUE(net::IsLocalhost("127.0.0.255"));
+  EXPECT_TRUE(net::IsLocalhost("127.0.255.0"));
+  EXPECT_TRUE(net::IsLocalhost("127.255.0.0"));
+  EXPECT_TRUE(net::IsLocalhost("::1"));
+  EXPECT_TRUE(net::IsLocalhost("0:0:0:0:0:0:0:1"));
+
+  EXPECT_FALSE(net::IsLocalhost("localhostx"));
+  EXPECT_FALSE(net::IsLocalhost("foo.localdomain"));
+  EXPECT_FALSE(net::IsLocalhost("localhost6x"));
+  EXPECT_FALSE(net::IsLocalhost("localhost.localdomain6"));
+  EXPECT_FALSE(net::IsLocalhost("localhost6.localdomain"));
+  EXPECT_FALSE(net::IsLocalhost("127.0.0.1.1"));
+  EXPECT_FALSE(net::IsLocalhost(".127.0.0.255"));
+  EXPECT_FALSE(net::IsLocalhost("::2"));
+  EXPECT_FALSE(net::IsLocalhost("::1:1"));
+  EXPECT_FALSE(net::IsLocalhost("0:0:0:0:1:0:0:1"));
+  EXPECT_FALSE(net::IsLocalhost("::1:1"));
+  EXPECT_FALSE(net::IsLocalhost("0:0:0:0:0:0:0:0:1"));
+}
+
 // Verify GetNetworkList().
 TEST(NetUtilTest, GetNetworkList) {
   net::NetworkInterfaceList list;