Update bulidbucket client

common/lhttp/utils.go

 // Copyright 2015 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package lhttp
 
 import (
         "errors"
+        "net"
         "net/url"
         "strings"
 )
 
 func hostRequiresSSL(host string) bool {
         host = strings.ToLower(host)
         return strings.HasSuffix(host, ".appspot.com")
 }
 
 // CheckURL ensures that the URL has a valid scheme, and that, if it is an
@@ skipping 13 matching lines @@
                 return "", errors.New("Only http:// or https:// scheme is accepted.")
         }
         if u.Scheme != "https" && hostRequiresSSL(u.Host) {
                 return "", errors.New("only https:// scheme is accepted for appspot hosts, it can be omitted")
         }
         if _, err = url.Parse(s); err != nil {
                 return "", err
         }
         return s, nil
 }
+
+// IsLocalHost returns true if hostport is local.
+func IsLocalHost(hostport string) bool {
+        host, _, err := net.SplitHostPort(hostport)
+        if err != nil {
+                return false
+        }
+        switch {
+        case host == "localhost", host == "":
+        case net.ParseIP(host).IsLoopback():
+
+        default:
+                return false
+        }
+        return true
+}