Update github.com/xenolf/lego to 0.4.1

vendor/google.golang.org/api/gensupport/retry.go

@@ -1,3 +1,17 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package gensupport
 
 import (
@@ -55,23 +69,17 @@ func DefaultBackoffStrategy() BackoffStrategy {
 // shouldRetry returns true if the HTTP response / error indicates that the
 // request should be attempted again.
 func shouldRetry(status int, err error) bool {
-	// Retry for 5xx response codes.
-	if 500 <= status && status < 600 {
+	if 500 <= status && status <= 599 {
 		return true
 	}
-
-	// Retry on statusTooManyRequests{
 	if status == statusTooManyRequests {
 		return true
 	}
-
-	// Retry on unexpected EOFs and temporary network errors.
 	if err == io.ErrUnexpectedEOF {
 		return true
 	}
 	if err, ok := err.(net.Error); ok {
 		return err.Temporary()
 	}
-
 	return false
 }