vendor/golang.org/x/net/http2/headermap.go

   1 // Copyright 2014 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 http2
   6
   7 import (
   8         "net/http"
   9         "strings"
  10 )
  11
  12 var (
  13         commonLowerHeader = map[string]string{} // Go-Canonical-Case -> lower-case
  14         commonCanonHeader = map[string]string{} // lower-case -> Go-Canonical-Case
  15 )
  16
  17 func init() {
  18         for _, v := range []string{
  19                 "accept",
  20                 "accept-charset",
  21                 "accept-encoding",
  22                 "accept-language",
  23                 "accept-ranges",
  24                 "age",
  25                 "access-control-allow-origin",
  26                 "allow",
  27                 "authorization",
  28                 "cache-control",
  29                 "content-disposition",
  30                 "content-encoding",
  31                 "content-language",
  32                 "content-length",
  33                 "content-location",
  34                 "content-range",
  35                 "content-type",
  36                 "cookie",
  37                 "date",
  38                 "etag",
  39                 "expect",
  40                 "expires",
  41                 "from",
  42                 "host",
  43                 "if-match",
  44                 "if-modified-since",
  45                 "if-none-match",
  46                 "if-unmodified-since",
  47                 "last-modified",
  48                 "link",
  49                 "location",
  50                 "max-forwards",
  51                 "proxy-authenticate",
  52                 "proxy-authorization",
  53                 "range",
  54                 "referer",
  55                 "refresh",
  56                 "retry-after",
  57                 "server",
  58                 "set-cookie",
  59                 "strict-transport-security",
  60                 "trailer",
  61                 "transfer-encoding",
  62                 "user-agent",
  63                 "vary",
  64                 "via",
  65                 "www-authenticate",
  66         } {
  67                 chk := http.CanonicalHeaderKey(v)
  68                 commonLowerHeader[chk] = v
  69                 commonCanonHeader[v] = chk
  70         }
  71 }
  72
  73 func lowerHeader(v string) string {
  74         if s, ok := commonLowerHeader[v]; ok {
  75                 return s
  76         }
  77         return strings.ToLower(v)
  78 }