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

net/base/net_util.cc

Index: net/base/net_util.cc
diff --git a/net/base/net_util.cc b/net/base/net_util.cc
index 1a8aa8962ffac5393f49848a33a0db768100ef46..4ed2e528e605feaff218533c261806f8023fad52 100644
--- a/net/base/net_util.cc
+++ b/net/base/net_util.cc
@@ -2111,6 +2111,46 @@ int GetPortFromSockaddr(const struct sockaddr* address, socklen_t address_len) {
   return ntohs(*port_field);
 }
 
+bool IsLocalhost(const std::string& host) {
+  if (host == "localhost" ||
+      host == "localhost.localdomain" ||
+      host == "localhost6" ||
+      host == "localhost6.localdomain6")

[yzshen1, 2011/03/24 20:06:37]

[minor, optional] might be good to change the comment in .h file to reflect this
change.

[Jói, 2011/03/24 22:03:45]

Done.

+    return true;
+
+  IPAddressNumber ip_number;
+  if (ParseIPLiteralToNumber(host, &ip_number)) {
+    size_t size = ip_number.size();
+    switch (size) {
+      case kIPv4AddressSize: {
+        IPAddressNumber localhost_prefix;
+        localhost_prefix.push_back(127);
+        for (int i = 0; i < 3; ++i) {
+          localhost_prefix.push_back(0);
+        }
+        return IPNumberMatchesPrefix(ip_number, localhost_prefix, 8);
+      }
+
+      case kIPv6AddressSize: {
+        if (ip_number[15] != 1)
+          return false;
+
+        for (int i = 0; i < 15; ++i) {
+          if (ip_number[i] != 0)
+            return false;
+        }
+
+        return true;
+      }
+
+      default:
+        NOTREACHED();
+    }
+  }
+
+  return false;
+}
+
 NetworkInterface::NetworkInterface() {
 }