1 // Copyright 2010 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.
16 // A Header represents the key-value pairs in an HTTP header.
17 type Header map[string][]string
19 // Add adds the key, value pair to the header.
20 // It appends to any existing values associated with key.
21 func (h Header) Add(key, value string) {
22 textproto.MIMEHeader(h).Add(key, value)
25 // Set sets the header entries associated with key to
26 // the single element value. It replaces any existing
27 // values associated with key.
28 func (h Header) Set(key, value string) {
29 textproto.MIMEHeader(h).Set(key, value)
32 // Get gets the first value associated with the given key.
33 // If there are no values associated with the key, Get returns "".
34 // Get is a convenience method. For more complex queries,
35 // access the map directly.
36 func (h Header) Get(key string) string {
37 return textproto.MIMEHeader(h).Get(key)
40 // Del deletes the values associated with key.
41 func (h Header) Del(key string) {
42 textproto.MIMEHeader(h).Del(key)
45 // Write writes a header in wire format.
46 func (h Header) Write(w io.Writer) os.Error {
47 return h.WriteSubset(w, nil)
50 // WriteSubset writes a header in wire format.
51 // If exclude is not nil, keys where exclude[key] == true are not written.
52 func (h Header) WriteSubset(w io.Writer, exclude map[string]bool) os.Error {
53 keys := make([]string, 0, len(h))
55 if exclude == nil || !exclude[k] {
56 keys = append(keys, k)
60 for _, k := range keys {
61 for _, v := range h[k] {
62 v = strings.Replace(v, "\n", " ", -1)
63 v = strings.Replace(v, "\r", " ", -1)
64 v = strings.TrimSpace(v)
65 if _, err := fmt.Fprintf(w, "%s: %s\r\n", k, v); err != nil {
73 // CanonicalHeaderKey returns the canonical format of the
74 // header key s. The canonicalization converts the first
75 // letter and any letter following a hyphen to upper case;
76 // the rest are converted to lowercase. For example, the
77 // canonical key for "accept-encoding" is "Accept-Encoding".
78 func CanonicalHeaderKey(s string) string { return textproto.CanonicalMIMEHeaderKey(s) }