Resolve RFC 6761 localhost names to loopback

net/test/spawned_test_server/base_test_server.cc

Index: net/test/spawned_test_server/base_test_server.cc
diff --git a/net/test/spawned_test_server/base_test_server.cc b/net/test/spawned_test_server/base_test_server.cc
index 5d97f8dd6bca5ce51a7f0f51bb723cddac66486c..dddb02dc2abdd4e361722b23fb098b14521a0173 100644
--- a/net/test/spawned_test_server/base_test_server.cc
+++ b/net/test/spawned_test_server/base_test_server.cc
@@ -236,6 +236,13 @@ bool BaseTestServer::GetAddressList(AddressList* address_list) const {
 
   scoped_ptr<HostResolver> resolver(HostResolver::CreateDefaultResolver(NULL));
   HostResolver::RequestInfo info(host_port_pair_);
+  // Limit the lookup to IPv4. When started with the default
+  // address of kLocalhost, testserver.py only supports IPv4.
+  // If a custom hostname is used, it's possible that the test
+  // server will listen on both IPv4 and IPv6, so this will
+  // still work. The testserver does not support explicit
+  // IPv6 literal hostnames.
+  info.set_address_family(ADDRESS_FAMILY_IPV4);
   TestCompletionCallback callback;
   int rv = resolver->Resolve(info,
                              DEFAULT_PRIORITY,