cubefs
1// Copyright 2018 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5// Package httpguts provides functions implementing various details
6// of the HTTP specification.
7//
8// This package is shared by the standard library (which vendors it)
9// and x/net/http2. It comes with no API stability promise.
10package httpguts11
12import (13"net/textproto"14"strings"15)
16
17// ValidTrailerHeader reports whether name is a valid header field name to appear
18// in trailers.
19// See RFC 7230, Section 4.1.2
20func ValidTrailerHeader(name string) bool {21name = textproto.CanonicalMIMEHeaderKey(name)22if strings.HasPrefix(name, "If-") || badTrailer[name] {23return false24}25return true26}
27
28var badTrailer = map[string]bool{29"Authorization": true,30"Cache-Control": true,31"Connection": true,32"Content-Encoding": true,33"Content-Length": true,34"Content-Range": true,35"Content-Type": true,36"Expect": true,37"Host": true,38"Keep-Alive": true,39"Max-Forwards": true,40"Pragma": true,41"Proxy-Authenticate": true,42"Proxy-Authorization": true,43"Proxy-Connection": true,44"Range": true,45"Realm": true,46"Te": true,47"Trailer": true,48"Transfer-Encoding": true,49"Www-Authenticate": true,50}
51