Source file src/pkg/vendor/golang.org/x/net/http/httpguts/guts.go

     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.
    10	package httpguts
    11	
    12	import (
    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
    20	func ValidTrailerHeader(name string) bool {
    21		name = textproto.CanonicalMIMEHeaderKey(name)
    22		if strings.HasPrefix(name, "If-") || badTrailer[name] {
    23			return false
    24		}
    25		return true
    26	}
    27	
    28	var 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	

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