On Apache
Under GNU General Public License
2024-04-20 05:42 @18.117.142.128 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
HTTP::Headers::Util(3pm) User Contributed Perl Documentation HTTP::Headers::Util(3pm)
NAME
HTTP::Headers::Util - Header value parsing utility functions
VERSION
version 6.22
SYNOPSIS
use HTTP::Headers::Util qw(split_header_words);
@values = split_header_words($h->header("Content-Type"));
DESCRIPTION
This module provides a few functions that helps parsing and construction of valid HTTP
header values. None of the functions are exported by default.
The following functions are available:
split_header_words( @header_values )
This function will parse the header values given as argument into a list of anonymous
arrays containing key/value pairs. The function knows how to deal with ",", ";" and
"=" as well as quoted values after "=". A list of space separated tokens are parsed
as if they were separated by ";".
If the @header_values passed as argument contains multiple values, then they are
treated as if they were a single value separated by comma ",".
This means that this function is useful for parsing header fields that follow this
syntax (BNF as from the HTTP/1.1 specification, but we relax the requirement for
tokens).
headers = #header
header = (token | parameter) *( [";"] (token | parameter))
token = 1*<any CHAR except CTLs or separators>
separators = "(" | ")" | "<" | ">" | "@"
| "," | ";" | ":" | "\" | <">
| "/" | "[" | "]" | "?" | "="
| "{" | "}" | SP | HT
quoted-string = ( <"> *(qdtext | quoted-pair ) <"> )
qdtext = <any TEXT except <">>
quoted-pair = "\" CHAR
parameter = attribute "=" value
attribute = token
value = token | quoted-string
Each header is represented by an anonymous array of key/value pairs. The keys will be
all be forced to lower case. The value for a simple token (not part of a parameter)
is "undef". Syntactically incorrect headers will not necessarily be parsed as you
would want.
This is easier to describe with some examples:
split_header_words('foo="bar"; port="80,81"; DISCARD, BAR=baz');
split_header_words('text/html; charset="iso-8859-1"');
split_header_words('Basic realm="\\"foo\\\\bar\\""');
will return
[foo=>'bar', port=>'80,81', discard=> undef], [bar=>'baz' ]
['text/html' => undef, charset => 'iso-8859-1']
[basic => undef, realm => "\"foo\\bar\""]
If you don't want the function to convert tokens and attribute keys to lower case you
can call it as "_split_header_words" instead (with a leading underscore).
join_header_words( @arrays )
This will do the opposite of the conversion done by split_header_words(). It takes a
list of anonymous arrays as arguments (or a list of key/value pairs) and produces a
single header value. Attribute values are quoted if needed.
Example:
join_header_words(["text/plain" => undef, charset => "iso-8859/1"]);
join_header_words("text/plain" => undef, charset => "iso-8859/1");
will both return the string:
text/plain; charset="iso-8859/1"
AUTHOR
Gisle Aas <gisle AT activestate.com>
COPYRIGHT AND LICENSE
This software is copyright (c) 1994-2017 by Gisle Aas.
This is free software; you can redistribute it and/or modify it under the same terms as
the Perl 5 programming language system itself.
perl v5.30.0 2020-02-29 HTTP::Headers::Util(3pm)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
2024-04-20 05:42 @18.117.142.128 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)