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.
5 // Package httpguts provides functions implementing various details
6 // of the HTTP specification.
8 // This package is shared by the standard library (which vendors it)
9 // and x/net/http2. It comes with no API stability promise.
17 // ValidTrailerHeader reports whether name is a valid header field name to appear
19 // See RFC 7230, Section 4.1.2
20 func ValidTrailerHeader(name string) bool {
21 name = textproto.CanonicalMIMEHeaderKey(name)
22 if strings.HasPrefix(name, "If-") || badTrailer[name] {
28 var badTrailer = map[string]bool{
29 "Authorization": true,
30 "Cache-Control": true,
32 "Content-Encoding": true,
33 "Content-Length": true,
34 "Content-Range": true,
41 "Proxy-Authenticate": true,
42 "Proxy-Authorization": true,
43 "Proxy-Connection": true,
48 "Transfer-Encoding": true,
49 "Www-Authenticate": true,