gtsocial-umbx

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guts.go (1425B)

      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 }