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khenaidoo59ce9dd2019-11-11 13:05:32 -05001// Copyright 2018 The etcd Authors
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7// http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15// Copyright 2015 The Go Authors. All rights reserved.
16// Use of this source code is governed by a BSD-style
17// license that can be found in the LICENSE file.
18
19// Package httputil provides HTTP utility functions.
20package httputil
21
22import (
23 "io"
24 "io/ioutil"
25 "net"
26 "net/http"
27)
28
29// GracefulClose drains http.Response.Body until it hits EOF
30// and closes it. This prevents TCP/TLS connections from closing,
31// therefore available for reuse.
32// Borrowed from golang/net/context/ctxhttp/cancelreq.go.
33func GracefulClose(resp *http.Response) {
34 io.Copy(ioutil.Discard, resp.Body)
35 resp.Body.Close()
36}
37
38// GetHostname returns the hostname from request Host field.
39// It returns empty string, if Host field contains invalid
40// value (e.g. "localhost:::" with too many colons).
41func GetHostname(req *http.Request) string {
42 if req == nil {
43 return ""
44 }
45 h, _, err := net.SplitHostPort(req.Host)
46 if err != nil {
47 return req.Host
48 }
49 return h
50}