Bump google.golang.org/api

vendor/github.com/google/martian/httpspec/httpspec.go

@@ -0,0 +1,48 @@
+// Copyright 2015 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 httpspec provides a modifier stack that has been preconfigured to
+// provide spec-compliant HTTP proxy behavior.
+//
+// Related: https://www.mnot.net/blog/2011/07/11/what_proxies_must_do
+package httpspec
+
+import (
+	"github.com/google/martian/fifo"
+	"github.com/google/martian/header"
+)
+
+// NewStack returns a martian modifier stack that handles ensuring proper proxy
+// behavior, in addition to a fifo.Group that can be used to add additional
+// modifiers within the stack.
+func NewStack(via string) (outer *fifo.Group, inner *fifo.Group) {
+	outer = fifo.NewGroup()
+
+	hbhm := header.NewHopByHopModifier()
+	outer.AddRequestModifier(hbhm)
+	outer.AddRequestModifier(header.NewForwardedModifier())
+	outer.AddRequestModifier(header.NewBadFramingModifier())
+
+	vm := header.NewViaModifier(via)
+	outer.AddRequestModifier(vm)
+
+	inner = fifo.NewGroup()
+	outer.AddRequestModifier(inner)
+	outer.AddResponseModifier(inner)
+
+	outer.AddResponseModifier(vm)
+	outer.AddResponseModifier(hbhm)
+
+	return outer, inner
+}