diff --git a/vendor/google.golang.org/appengine/internal/urlfetch/urlfetch_service.pb.go b/vendor/google.golang.org/appengine/internal/urlfetch/urlfetch_service.pb.go
new file mode 100644
index 000000000..af463fbb2
--- /dev/null
+++ b/vendor/google.golang.org/appengine/internal/urlfetch/urlfetch_service.pb.go
@@ -0,0 +1,355 @@
+// Code generated by protoc-gen-go.
+// source: google.golang.org/appengine/internal/urlfetch/urlfetch_service.proto
+// DO NOT EDIT!
+
+/*
+Package urlfetch is a generated protocol buffer package.
+
+It is generated from these files:
+	google.golang.org/appengine/internal/urlfetch/urlfetch_service.proto
+
+It has these top-level messages:
+	URLFetchServiceError
+	URLFetchRequest
+	URLFetchResponse
+*/
+package urlfetch
+
+import proto "github.com/golang/protobuf/proto"
+import fmt "fmt"
+import math "math"
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+type URLFetchServiceError_ErrorCode int32
+
+const (
+	URLFetchServiceError_OK                       URLFetchServiceError_ErrorCode = 0
+	URLFetchServiceError_INVALID_URL              URLFetchServiceError_ErrorCode = 1
+	URLFetchServiceError_FETCH_ERROR              URLFetchServiceError_ErrorCode = 2
+	URLFetchServiceError_UNSPECIFIED_ERROR        URLFetchServiceError_ErrorCode = 3
+	URLFetchServiceError_RESPONSE_TOO_LARGE       URLFetchServiceError_ErrorCode = 4
+	URLFetchServiceError_DEADLINE_EXCEEDED        URLFetchServiceError_ErrorCode = 5
+	URLFetchServiceError_SSL_CERTIFICATE_ERROR    URLFetchServiceError_ErrorCode = 6
+	URLFetchServiceError_DNS_ERROR                URLFetchServiceError_ErrorCode = 7
+	URLFetchServiceError_CLOSED                   URLFetchServiceError_ErrorCode = 8
+	URLFetchServiceError_INTERNAL_TRANSIENT_ERROR URLFetchServiceError_ErrorCode = 9
+	URLFetchServiceError_TOO_MANY_REDIRECTS       URLFetchServiceError_ErrorCode = 10
+	URLFetchServiceError_MALFORMED_REPLY          URLFetchServiceError_ErrorCode = 11
+	URLFetchServiceError_CONNECTION_ERROR         URLFetchServiceError_ErrorCode = 12
+)
+
+var URLFetchServiceError_ErrorCode_name = map[int32]string{
+	0:  "OK",
+	1:  "INVALID_URL",
+	2:  "FETCH_ERROR",
+	3:  "UNSPECIFIED_ERROR",
+	4:  "RESPONSE_TOO_LARGE",
+	5:  "DEADLINE_EXCEEDED",
+	6:  "SSL_CERTIFICATE_ERROR",
+	7:  "DNS_ERROR",
+	8:  "CLOSED",
+	9:  "INTERNAL_TRANSIENT_ERROR",
+	10: "TOO_MANY_REDIRECTS",
+	11: "MALFORMED_REPLY",
+	12: "CONNECTION_ERROR",
+}
+var URLFetchServiceError_ErrorCode_value = map[string]int32{
+	"OK":                       0,
+	"INVALID_URL":              1,
+	"FETCH_ERROR":              2,
+	"UNSPECIFIED_ERROR":        3,
+	"RESPONSE_TOO_LARGE":       4,
+	"DEADLINE_EXCEEDED":        5,
+	"SSL_CERTIFICATE_ERROR":    6,
+	"DNS_ERROR":                7,
+	"CLOSED":                   8,
+	"INTERNAL_TRANSIENT_ERROR": 9,
+	"TOO_MANY_REDIRECTS":       10,
+	"MALFORMED_REPLY":          11,
+	"CONNECTION_ERROR":         12,
+}
+
+func (x URLFetchServiceError_ErrorCode) Enum() *URLFetchServiceError_ErrorCode {
+	p := new(URLFetchServiceError_ErrorCode)
+	*p = x
+	return p
+}
+func (x URLFetchServiceError_ErrorCode) String() string {
+	return proto.EnumName(URLFetchServiceError_ErrorCode_name, int32(x))
+}
+func (x *URLFetchServiceError_ErrorCode) UnmarshalJSON(data []byte) error {
+	value, err := proto.UnmarshalJSONEnum(URLFetchServiceError_ErrorCode_value, data, "URLFetchServiceError_ErrorCode")
+	if err != nil {
+		return err
+	}
+	*x = URLFetchServiceError_ErrorCode(value)
+	return nil
+}
+
+type URLFetchRequest_RequestMethod int32
+
+const (
+	URLFetchRequest_GET    URLFetchRequest_RequestMethod = 1
+	URLFetchRequest_POST   URLFetchRequest_RequestMethod = 2
+	URLFetchRequest_HEAD   URLFetchRequest_RequestMethod = 3
+	URLFetchRequest_PUT    URLFetchRequest_RequestMethod = 4
+	URLFetchRequest_DELETE URLFetchRequest_RequestMethod = 5
+	URLFetchRequest_PATCH  URLFetchRequest_RequestMethod = 6
+)
+
+var URLFetchRequest_RequestMethod_name = map[int32]string{
+	1: "GET",
+	2: "POST",
+	3: "HEAD",
+	4: "PUT",
+	5: "DELETE",
+	6: "PATCH",
+}
+var URLFetchRequest_RequestMethod_value = map[string]int32{
+	"GET":    1,
+	"POST":   2,
+	"HEAD":   3,
+	"PUT":    4,
+	"DELETE": 5,
+	"PATCH":  6,
+}
+
+func (x URLFetchRequest_RequestMethod) Enum() *URLFetchRequest_RequestMethod {
+	p := new(URLFetchRequest_RequestMethod)
+	*p = x
+	return p
+}
+func (x URLFetchRequest_RequestMethod) String() string {
+	return proto.EnumName(URLFetchRequest_RequestMethod_name, int32(x))
+}
+func (x *URLFetchRequest_RequestMethod) UnmarshalJSON(data []byte) error {
+	value, err := proto.UnmarshalJSONEnum(URLFetchRequest_RequestMethod_value, data, "URLFetchRequest_RequestMethod")
+	if err != nil {
+		return err
+	}
+	*x = URLFetchRequest_RequestMethod(value)
+	return nil
+}
+
+type URLFetchServiceError struct {
+	XXX_unrecognized []byte `json:"-"`
+}
+
+func (m *URLFetchServiceError) Reset()         { *m = URLFetchServiceError{} }
+func (m *URLFetchServiceError) String() string { return proto.CompactTextString(m) }
+func (*URLFetchServiceError) ProtoMessage()    {}
+
+type URLFetchRequest struct {
+	Method                        *URLFetchRequest_RequestMethod `protobuf:"varint,1,req,name=Method,enum=appengine.URLFetchRequest_RequestMethod" json:"Method,omitempty"`
+	Url                           *string                        `protobuf:"bytes,2,req,name=Url" json:"Url,omitempty"`
+	Header                        []*URLFetchRequest_Header      `protobuf:"group,3,rep,name=Header" json:"header,omitempty"`
+	Payload                       []byte                         `protobuf:"bytes,6,opt,name=Payload" json:"Payload,omitempty"`
+	FollowRedirects               *bool                          `protobuf:"varint,7,opt,name=FollowRedirects,def=1" json:"FollowRedirects,omitempty"`
+	Deadline                      *float64                       `protobuf:"fixed64,8,opt,name=Deadline" json:"Deadline,omitempty"`
+	MustValidateServerCertificate *bool                          `protobuf:"varint,9,opt,name=MustValidateServerCertificate,def=1" json:"MustValidateServerCertificate,omitempty"`
+	XXX_unrecognized              []byte                         `json:"-"`
+}
+
+func (m *URLFetchRequest) Reset()         { *m = URLFetchRequest{} }
+func (m *URLFetchRequest) String() string { return proto.CompactTextString(m) }
+func (*URLFetchRequest) ProtoMessage()    {}
+
+const Default_URLFetchRequest_FollowRedirects bool = true
+const Default_URLFetchRequest_MustValidateServerCertificate bool = true
+
+func (m *URLFetchRequest) GetMethod() URLFetchRequest_RequestMethod {
+	if m != nil && m.Method != nil {
+		return *m.Method
+	}
+	return URLFetchRequest_GET
+}
+
+func (m *URLFetchRequest) GetUrl() string {
+	if m != nil && m.Url != nil {
+		return *m.Url
+	}
+	return ""
+}
+
+func (m *URLFetchRequest) GetHeader() []*URLFetchRequest_Header {
+	if m != nil {
+		return m.Header
+	}
+	return nil
+}
+
+func (m *URLFetchRequest) GetPayload() []byte {
+	if m != nil {
+		return m.Payload
+	}
+	return nil
+}
+
+func (m *URLFetchRequest) GetFollowRedirects() bool {
+	if m != nil && m.FollowRedirects != nil {
+		return *m.FollowRedirects
+	}
+	return Default_URLFetchRequest_FollowRedirects
+}
+
+func (m *URLFetchRequest) GetDeadline() float64 {
+	if m != nil && m.Deadline != nil {
+		return *m.Deadline
+	}
+	return 0
+}
+
+func (m *URLFetchRequest) GetMustValidateServerCertificate() bool {
+	if m != nil && m.MustValidateServerCertificate != nil {
+		return *m.MustValidateServerCertificate
+	}
+	return Default_URLFetchRequest_MustValidateServerCertificate
+}
+
+type URLFetchRequest_Header struct {
+	Key              *string `protobuf:"bytes,4,req,name=Key" json:"Key,omitempty"`
+	Value            *string `protobuf:"bytes,5,req,name=Value" json:"Value,omitempty"`
+	XXX_unrecognized []byte  `json:"-"`
+}
+
+func (m *URLFetchRequest_Header) Reset()         { *m = URLFetchRequest_Header{} }
+func (m *URLFetchRequest_Header) String() string { return proto.CompactTextString(m) }
+func (*URLFetchRequest_Header) ProtoMessage()    {}
+
+func (m *URLFetchRequest_Header) GetKey() string {
+	if m != nil && m.Key != nil {
+		return *m.Key
+	}
+	return ""
+}
+
+func (m *URLFetchRequest_Header) GetValue() string {
+	if m != nil && m.Value != nil {
+		return *m.Value
+	}
+	return ""
+}
+
+type URLFetchResponse struct {
+	Content               []byte                     `protobuf:"bytes,1,opt,name=Content" json:"Content,omitempty"`
+	StatusCode            *int32                     `protobuf:"varint,2,req,name=StatusCode" json:"StatusCode,omitempty"`
+	Header                []*URLFetchResponse_Header `protobuf:"group,3,rep,name=Header" json:"header,omitempty"`
+	ContentWasTruncated   *bool                      `protobuf:"varint,6,opt,name=ContentWasTruncated,def=0" json:"ContentWasTruncated,omitempty"`
+	ExternalBytesSent     *int64                     `protobuf:"varint,7,opt,name=ExternalBytesSent" json:"ExternalBytesSent,omitempty"`
+	ExternalBytesReceived *int64                     `protobuf:"varint,8,opt,name=ExternalBytesReceived" json:"ExternalBytesReceived,omitempty"`
+	FinalUrl              *string                    `protobuf:"bytes,9,opt,name=FinalUrl" json:"FinalUrl,omitempty"`
+	ApiCpuMilliseconds    *int64                     `protobuf:"varint,10,opt,name=ApiCpuMilliseconds,def=0" json:"ApiCpuMilliseconds,omitempty"`
+	ApiBytesSent          *int64                     `protobuf:"varint,11,opt,name=ApiBytesSent,def=0" json:"ApiBytesSent,omitempty"`
+	ApiBytesReceived      *int64                     `protobuf:"varint,12,opt,name=ApiBytesReceived,def=0" json:"ApiBytesReceived,omitempty"`
+	XXX_unrecognized      []byte                     `json:"-"`
+}
+
+func (m *URLFetchResponse) Reset()         { *m = URLFetchResponse{} }
+func (m *URLFetchResponse) String() string { return proto.CompactTextString(m) }
+func (*URLFetchResponse) ProtoMessage()    {}
+
+const Default_URLFetchResponse_ContentWasTruncated bool = false
+const Default_URLFetchResponse_ApiCpuMilliseconds int64 = 0
+const Default_URLFetchResponse_ApiBytesSent int64 = 0
+const Default_URLFetchResponse_ApiBytesReceived int64 = 0
+
+func (m *URLFetchResponse) GetContent() []byte {
+	if m != nil {
+		return m.Content
+	}
+	return nil
+}
+
+func (m *URLFetchResponse) GetStatusCode() int32 {
+	if m != nil && m.StatusCode != nil {
+		return *m.StatusCode
+	}
+	return 0
+}
+
+func (m *URLFetchResponse) GetHeader() []*URLFetchResponse_Header {
+	if m != nil {
+		return m.Header
+	}
+	return nil
+}
+
+func (m *URLFetchResponse) GetContentWasTruncated() bool {
+	if m != nil && m.ContentWasTruncated != nil {
+		return *m.ContentWasTruncated
+	}
+	return Default_URLFetchResponse_ContentWasTruncated
+}
+
+func (m *URLFetchResponse) GetExternalBytesSent() int64 {
+	if m != nil && m.ExternalBytesSent != nil {
+		return *m.ExternalBytesSent
+	}
+	return 0
+}
+
+func (m *URLFetchResponse) GetExternalBytesReceived() int64 {
+	if m != nil && m.ExternalBytesReceived != nil {
+		return *m.ExternalBytesReceived
+	}
+	return 0
+}
+
+func (m *URLFetchResponse) GetFinalUrl() string {
+	if m != nil && m.FinalUrl != nil {
+		return *m.FinalUrl
+	}
+	return ""
+}
+
+func (m *URLFetchResponse) GetApiCpuMilliseconds() int64 {
+	if m != nil && m.ApiCpuMilliseconds != nil {
+		return *m.ApiCpuMilliseconds
+	}
+	return Default_URLFetchResponse_ApiCpuMilliseconds
+}
+
+func (m *URLFetchResponse) GetApiBytesSent() int64 {
+	if m != nil && m.ApiBytesSent != nil {
+		return *m.ApiBytesSent
+	}
+	return Default_URLFetchResponse_ApiBytesSent
+}
+
+func (m *URLFetchResponse) GetApiBytesReceived() int64 {
+	if m != nil && m.ApiBytesReceived != nil {
+		return *m.ApiBytesReceived
+	}
+	return Default_URLFetchResponse_ApiBytesReceived
+}
+
+type URLFetchResponse_Header struct {
+	Key              *string `protobuf:"bytes,4,req,name=Key" json:"Key,omitempty"`
+	Value            *string `protobuf:"bytes,5,req,name=Value" json:"Value,omitempty"`
+	XXX_unrecognized []byte  `json:"-"`
+}
+
+func (m *URLFetchResponse_Header) Reset()         { *m = URLFetchResponse_Header{} }
+func (m *URLFetchResponse_Header) String() string { return proto.CompactTextString(m) }
+func (*URLFetchResponse_Header) ProtoMessage()    {}
+
+func (m *URLFetchResponse_Header) GetKey() string {
+	if m != nil && m.Key != nil {
+		return *m.Key
+	}
+	return ""
+}
+
+func (m *URLFetchResponse_Header) GetValue() string {
+	if m != nil && m.Value != nil {
+		return *m.Value
+	}
+	return ""
+}
+
+func init() {
+}
diff --git a/vendor/google.golang.org/appengine/internal/urlfetch/urlfetch_service.proto b/vendor/google.golang.org/appengine/internal/urlfetch/urlfetch_service.proto
new file mode 100644
index 000000000..f695edf6a
--- /dev/null
+++ b/vendor/google.golang.org/appengine/internal/urlfetch/urlfetch_service.proto
@@ -0,0 +1,64 @@
+syntax = "proto2";
+option go_package = "urlfetch";
+
+package appengine;
+
+message URLFetchServiceError {
+  enum ErrorCode {
+    OK = 0;
+    INVALID_URL = 1;
+    FETCH_ERROR = 2;
+    UNSPECIFIED_ERROR = 3;
+    RESPONSE_TOO_LARGE = 4;
+    DEADLINE_EXCEEDED = 5;
+    SSL_CERTIFICATE_ERROR = 6;
+    DNS_ERROR = 7;
+    CLOSED = 8;
+    INTERNAL_TRANSIENT_ERROR = 9;
+    TOO_MANY_REDIRECTS = 10;
+    MALFORMED_REPLY = 11;
+    CONNECTION_ERROR = 12;
+  }
+}
+
+message URLFetchRequest {
+  enum RequestMethod {
+    GET = 1;
+    POST = 2;
+    HEAD = 3;
+    PUT = 4;
+    DELETE = 5;
+    PATCH = 6;
+  }
+  required RequestMethod Method = 1;
+  required string Url = 2;
+  repeated group Header = 3 {
+    required string Key = 4;
+    required string Value = 5;
+  }
+  optional bytes Payload = 6 [ctype=CORD];
+
+  optional bool FollowRedirects = 7 [default=true];
+
+  optional double Deadline = 8;
+
+  optional bool MustValidateServerCertificate = 9 [default=true];
+}
+
+message URLFetchResponse {
+  optional bytes Content = 1;
+  required int32 StatusCode = 2;
+  repeated group Header = 3 {
+    required string Key = 4;
+    required string Value = 5;
+  }
+  optional bool ContentWasTruncated = 6 [default=false];
+  optional int64 ExternalBytesSent = 7;
+  optional int64 ExternalBytesReceived = 8;
+
+  optional string FinalUrl = 9;
+
+  optional int64 ApiCpuMilliseconds = 10 [default=0];
+  optional int64 ApiBytesSent = 11 [default=0];
+  optional int64 ApiBytesReceived = 12 [default=0];
+}
diff --git a/vendor/google.golang.org/appengine/urlfetch/urlfetch.go b/vendor/google.golang.org/appengine/urlfetch/urlfetch.go
new file mode 100644
index 000000000..6ffe1e6d9
--- /dev/null
+++ b/vendor/google.golang.org/appengine/urlfetch/urlfetch.go
@@ -0,0 +1,210 @@
+// Copyright 2011 Google Inc. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+// Package urlfetch provides an http.RoundTripper implementation
+// for fetching URLs via App Engine's urlfetch service.
+package urlfetch // import "google.golang.org/appengine/urlfetch"
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/golang/protobuf/proto"
+	"golang.org/x/net/context"
+
+	"google.golang.org/appengine/internal"
+	pb "google.golang.org/appengine/internal/urlfetch"
+)
+
+// Transport is an implementation of http.RoundTripper for
+// App Engine. Users should generally create an http.Client using
+// this transport and use the Client rather than using this transport
+// directly.
+type Transport struct {
+	Context context.Context
+
+	// Controls whether the application checks the validity of SSL certificates
+	// over HTTPS connections. A value of false (the default) instructs the
+	// application to send a request to the server only if the certificate is
+	// valid and signed by a trusted certificate authority (CA), and also
+	// includes a hostname that matches the certificate. A value of true
+	// instructs the application to perform no certificate validation.
+	AllowInvalidServerCertificate bool
+}
+
+// Verify statically that *Transport implements http.RoundTripper.
+var _ http.RoundTripper = (*Transport)(nil)
+
+// Client returns an *http.Client using a default urlfetch Transport. This
+// client will have the default deadline of 5 seconds, and will check the
+// validity of SSL certificates.
+//
+// Any deadline of the provided context will be used for requests through this client;
+// if the client does not have a deadline then a 5 second default is used.
+func Client(ctx context.Context) *http.Client {
+	return &http.Client{
+		Transport: &Transport{
+			Context: ctx,
+		},
+	}
+}
+
+type bodyReader struct {
+	content   []byte
+	truncated bool
+	closed    bool
+}
+
+// ErrTruncatedBody is the error returned after the final Read() from a
+// response's Body if the body has been truncated by App Engine's proxy.
+var ErrTruncatedBody = errors.New("urlfetch: truncated body")
+
+func statusCodeToText(code int) string {
+	if t := http.StatusText(code); t != "" {
+		return t
+	}
+	return strconv.Itoa(code)
+}
+
+func (br *bodyReader) Read(p []byte) (n int, err error) {
+	if br.closed {
+		if br.truncated {
+			return 0, ErrTruncatedBody
+		}
+		return 0, io.EOF
+	}
+	n = copy(p, br.content)
+	if n > 0 {
+		br.content = br.content[n:]
+		return
+	}
+	if br.truncated {
+		br.closed = true
+		return 0, ErrTruncatedBody
+	}
+	return 0, io.EOF
+}
+
+func (br *bodyReader) Close() error {
+	br.closed = true
+	br.content = nil
+	return nil
+}
+
+// A map of the URL Fetch-accepted methods that take a request body.
+var methodAcceptsRequestBody = map[string]bool{
+	"POST":  true,
+	"PUT":   true,
+	"PATCH": true,
+}
+
+// urlString returns a valid string given a URL. This function is necessary because
+// the String method of URL doesn't correctly handle URLs with non-empty Opaque values.
+// See http://code.google.com/p/go/issues/detail?id=4860.
+func urlString(u *url.URL) string {
+	if u.Opaque == "" || strings.HasPrefix(u.Opaque, "//") {
+		return u.String()
+	}
+	aux := *u
+	aux.Opaque = "//" + aux.Host + aux.Opaque
+	return aux.String()
+}
+
+// RoundTrip issues a single HTTP request and returns its response. Per the
+// http.RoundTripper interface, RoundTrip only returns an error if there
+// was an unsupported request or the URL Fetch proxy fails.
+// Note that HTTP response codes such as 5xx, 403, 404, etc are not
+// errors as far as the transport is concerned and will be returned
+// with err set to nil.
+func (t *Transport) RoundTrip(req *http.Request) (res *http.Response, err error) {
+	methNum, ok := pb.URLFetchRequest_RequestMethod_value[req.Method]
+	if !ok {
+		return nil, fmt.Errorf("urlfetch: unsupported HTTP method %q", req.Method)
+	}
+
+	method := pb.URLFetchRequest_RequestMethod(methNum)
+
+	freq := &pb.URLFetchRequest{
+		Method:                        &method,
+		Url:                           proto.String(urlString(req.URL)),
+		FollowRedirects:               proto.Bool(false), // http.Client's responsibility
+		MustValidateServerCertificate: proto.Bool(!t.AllowInvalidServerCertificate),
+	}
+	if deadline, ok := t.Context.Deadline(); ok {
+		freq.Deadline = proto.Float64(deadline.Sub(time.Now()).Seconds())
+	}
+
+	for k, vals := range req.Header {
+		for _, val := range vals {
+			freq.Header = append(freq.Header, &pb.URLFetchRequest_Header{
+				Key:   proto.String(k),
+				Value: proto.String(val),
+			})
+		}
+	}
+	if methodAcceptsRequestBody[req.Method] && req.Body != nil {
+		// Avoid a []byte copy if req.Body has a Bytes method.
+		switch b := req.Body.(type) {
+		case interface {
+			Bytes() []byte
+		}:
+			freq.Payload = b.Bytes()
+		default:
+			freq.Payload, err = ioutil.ReadAll(req.Body)
+			if err != nil {
+				return nil, err
+			}
+		}
+	}
+
+	fres := &pb.URLFetchResponse{}
+	if err := internal.Call(t.Context, "urlfetch", "Fetch", freq, fres); err != nil {
+		return nil, err
+	}
+
+	res = &http.Response{}
+	res.StatusCode = int(*fres.StatusCode)
+	res.Status = fmt.Sprintf("%d %s", res.StatusCode, statusCodeToText(res.StatusCode))
+	res.Header = make(http.Header)
+	res.Request = req
+
+	// Faked:
+	res.ProtoMajor = 1
+	res.ProtoMinor = 1
+	res.Proto = "HTTP/1.1"
+	res.Close = true
+
+	for _, h := range fres.Header {
+		hkey := http.CanonicalHeaderKey(*h.Key)
+		hval := *h.Value
+		if hkey == "Content-Length" {
+			// Will get filled in below for all but HEAD requests.
+			if req.Method == "HEAD" {
+				res.ContentLength, _ = strconv.ParseInt(hval, 10, 64)
+			}
+			continue
+		}
+		res.Header.Add(hkey, hval)
+	}
+
+	if req.Method != "HEAD" {
+		res.ContentLength = int64(len(fres.Content))
+	}
+
+	truncated := fres.GetContentWasTruncated()
+	res.Body = &bodyReader{content: fres.Content, truncated: truncated}
+	return
+}
+
+func init() {
+	internal.RegisterErrorCodeMap("urlfetch", pb.URLFetchServiceError_ErrorCode_name)
+	internal.RegisterTimeoutErrorCode("urlfetch", int32(pb.URLFetchServiceError_DEADLINE_EXCEEDED))
+}
diff --git a/vendor/vendor.json b/vendor/vendor.json
index d7ccaa9b7..2d617b8cb 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -1065,6 +1065,18 @@
 			"revision": "4f7eeb5305a4ba1966344836ba4af9996b7b4e05",
 			"revisionTime": "2016-08-19T23:33:10Z"
 		},
+		{
+			"checksumSHA1": "QtAbHtHmDzcf6vOV9eqlCpKgjiw=",
+			"path": "google.golang.org/appengine/internal/urlfetch",
+			"revision": "a2f4131514e563cedfdb6e7d267df9ad48591e93",
+			"revisionTime": "2017-05-22T22:48:38Z"
+		},
+		{
+			"checksumSHA1": "akOV9pYnCbcPA8wJUutSQVibdyg=",
+			"path": "google.golang.org/appengine/urlfetch",
+			"revision": "a2f4131514e563cedfdb6e7d267df9ad48591e93",
+			"revisionTime": "2017-05-22T22:48:38Z"
+		},
 		{
 			"checksumSHA1": "Wp8g9MHRmK8SwcyGVCoGtPx+5Lo=",
 			"path": "google.golang.org/cloud/compute/metadata",