[ViewVC] Diff of: cvs/AnyEvent-HTTP/HTTP.pm

Comparing AnyEvent-HTTP/HTTP.pm (file contents):
Revision 1.4 by root, Wed Jun 4 11:59:22 2008 UTC vs.
Revision 1.50 by root, Tue Aug 11 13:20:42 2009 UTC

…		…
3	AnyEvent::HTTP - simple but non-blocking HTTP/HTTPS client	3	AnyEvent::HTTP - simple but non-blocking HTTP/HTTPS client
4		4
5	=head1 SYNOPSIS	5	=head1 SYNOPSIS
6		6
7	use AnyEvent::HTTP;	7	use AnyEvent::HTTP;
		8
		9	http_get "http://www.nethype.de/", sub { print $_[1] };
		10
		11	# ... do something else here
8		12
9	=head1 DESCRIPTION	13	=head1 DESCRIPTION
10		14
11	This module is an L<AnyEvent> user, you need to make sure that you use and	15	This module is an L<AnyEvent> user, you need to make sure that you use and
12	run a supported event loop.	16	run a supported event loop.
13		17
		18	This module implements a simple, stateless and non-blocking HTTP
		19	client. It supports GET, POST and other request methods, cookies and more,
		20	all on a very low level. It can follow redirects supports proxies and
		21	automatically limits the number of connections to the values specified in
		22	the RFC.
		23
		24	It should generally be a "good client" that is enough for most HTTP
		25	tasks. Simple tasks should be simple, but complex tasks should still be
		26	possible as the user retains control over request and response headers.
		27
		28	The caller is responsible for authentication management, cookies (if
		29	the simplistic implementation in this module doesn't suffice), referer
		30	and other high-level protocol details for which this module offers only
		31	limited support.
		32
14	=head2 METHODS	33	=head2 METHODS
15		34
16	=over 4	35	=over 4
17		36
18	=cut	37	=cut
…		…
20	package AnyEvent::HTTP;	39	package AnyEvent::HTTP;
21		40
22	use strict;	41	use strict;
23	no warnings;	42	no warnings;
24		43
25	use Carp;	44	use Errno ();
26		45
27	use AnyEvent ();	46	use AnyEvent 4.8 ();
28	use AnyEvent::Util ();	47	use AnyEvent::Util ();
29	use AnyEvent::Socket ();	48	use AnyEvent::Socket ();
30	use AnyEvent::Handle ();	49	use AnyEvent::Handle ();
31		50
32	use base Exporter::;	51	use base Exporter::;
33		52
34	our $VERSION = '1.0';	53	our $VERSION = '1.42';
35		54
36	our @EXPORT = qw(http_get http_request);	55	our @EXPORT = qw(http_get http_post http_head http_request);
37		56
38	our $USERAGENT = "Mozilla/5.0 (compatible; AnyEvent::HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)";	57	our $USERAGENT = "Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)";
39	our $MAX_RECURSE = 10;	58	our $MAX_RECURSE = 10;
40	our $MAX_PERSISTENT = 8;	59	our $MAX_PERSISTENT = 8;
41	our $PERSISTENT_TIMEOUT = 2;	60	our $PERSISTENT_TIMEOUT = 2;
42	our $TIMEOUT = 300;	61	our $TIMEOUT = 300;
43		62
44	# changing these is evil	63	# changing these is evil
45	our $MAX_PERSISTENT_PER_HOST = 2;	64	our $MAX_PERSISTENT_PER_HOST = 0;
46	our $MAX_PER_HOST = 4; # not respected yet :(	65	our $MAX_PER_HOST = 4;
47		66
48	our $PROXY;	67	our $PROXY;
		68	our $ACTIVE = 0;
49		69
50	my %KA_COUNT; # number of open keep-alive connections per host	70	my %KA_COUNT; # number of open keep-alive connections per host
		71	my %CO_SLOT; # number of open connections, and wait queue, per host
51		72
52	=item http_get $url, key => value..., $cb->($data, $headers)	73	=item http_get $url, key => value..., $cb->($data, $headers)
53		74
54	Executes an HTTP-GET request. See the http_request function for details on	75	Executes an HTTP-GET request. See the http_request function for details on
55	additional parameters.	76	additional parameters and the return value.
56		77
		78	=item http_head $url, key => value..., $cb->($data, $headers)
		79
		80	Executes an HTTP-HEAD request. See the http_request function for details
		81	on additional parameters and the return value.
		82
57	=item http_get $url, $body, key => value..., $cb->($data, $headers)	83	=item http_post $url, $body, key => value..., $cb->($data, $headers)
58		84
59	Executes an HTTP-POST request with a requets body of C<$bod>. See the	85	Executes an HTTP-POST request with a request body of C<$body>. See the
60	http_request function for details on additional parameters.	86	http_request function for details on additional parameters and the return
		87	value.
61		88
62	=item http_request $method => $url, key => value..., $cb->($data, $headers)	89	=item http_request $method => $url, key => value..., $cb->($data, $headers)
63		90
64	Executes a HTTP request of type C<$method> (e.g. C<GET>, C<POST>). The URL	91	Executes a HTTP request of type C<$method> (e.g. C<GET>, C<POST>). The URL
65	must be an absolute http or https URL.	92	must be an absolute http or https URL.
66		93
		94	When called in void context, nothing is returned. In other contexts,
		95	C<http_request> returns a "cancellation guard" - you have to keep the
		96	object at least alive until the callback get called. If the object gets
		97	destroyed before the callbakc is called, the request will be cancelled.
		98
67	The callback will be called with the response data as first argument	99	The callback will be called with the response body data as first argument
68	(or C<undef> if it wasn't available due to errors), and a hash-ref with	100	(or C<undef> if an error occured), and a hash-ref with response headers as
69	response headers as second argument.	101	second argument.
70		102
71	All the headers in that has are lowercased. In addition to the response	103	All the headers in that hash are lowercased. In addition to the response
72	headers, the three "pseudo-headers" C<HTTPVersion>, C<Status> and	104	headers, the "pseudo-headers" C<HTTPVersion>, C<Status> and C<Reason>
73	C<Reason> contain the three parts of the HTTP Status-Line of the same	105	contain the three parts of the HTTP Status-Line of the same name. The
74	name.	106	pseudo-header C<URL> contains the original URL (which can differ from the
		107	requested URL when following redirects).
		108
		109	If the server sends a header multiple times, then their contents will be
		110	joined together with a comma (C<,>), as per the HTTP spec.
75		111
76	If an internal error occurs, such as not being able to resolve a hostname,	112	If an internal error occurs, such as not being able to resolve a hostname,
77	then C<$data> will be C<undef>, C<< $headers->{Status} >> will be C<599>	113	then C<$data> will be C<undef>, C<< $headers->{Status} >> will be C<59x>
78	and the C<Reason> pseudo-header will contain an error message.	114	(usually C<599>) and the C<Reason> pseudo-header will contain an error
		115	message.
		116
		117	A typical callback might look like this:
		118
		119	sub {
		120	my ($body, $hdr) = @_;
		121
		122	if ($hdr->{Status} =~ /^2/) {
		123	... everything should be ok
		124	} else {
		125	print "error, $hdr->{Status} $hdr->{Reason}\n";
		126	}
		127	}
79		128
80	Additional parameters are key-value pairs, and are fully optional. They	129	Additional parameters are key-value pairs, and are fully optional. They
81	include:	130	include:
82		131
83	=over 4	132	=over 4
…		…
87	Whether to recurse requests or not, e.g. on redirects, authentication	136	Whether to recurse requests or not, e.g. on redirects, authentication
88	retries and so on, and how often to do so.	137	retries and so on, and how often to do so.
89		138
90	=item headers => hashref	139	=item headers => hashref
91		140
92	The request headers to use.	141	The request headers to use. Currently, C<http_request> may provide its
		142	own C<Host:>, C<Content-Length:>, C<Connection:> and C<Cookie:> headers
		143	and will provide defaults for C<User-Agent:> and C<Referer:> (this can be
		144	suppressed by using C<undef> for these headers in which case they won't be
		145	sent at all).
93		146
94	=item timeout => $seconds	147	=item timeout => $seconds
95		148
96	The time-out to use for various stages - each connect attempt will reset	149	The time-out to use for various stages - each connect attempt will reset
97	the timeout, as will read or write activity. Default timeout is 5 minutes.	150	the timeout, as will read or write activity. Default timeout is 5 minutes.
…		…
99	=item proxy => [$host, $port[, $scheme]] or undef	152	=item proxy => [$host, $port[, $scheme]] or undef
100		153
101	Use the given http proxy for all requests. If not specified, then the	154	Use the given http proxy for all requests. If not specified, then the
102	default proxy (as specified by C<$ENV{http_proxy}>) is used.	155	default proxy (as specified by C<$ENV{http_proxy}>) is used.
103		156
104	C<$scheme> must be either missing or C<http> for HTTP, or C<https> for	157	C<$scheme> must be either missing, C<http> for HTTP or C<https> for
105	HTTPS.	158	HTTPS.
106		159
107	=item body => $string	160	=item body => $string
108		161
109	The request body, usually empty. Will be-sent as-is (future versions of	162	The request body, usually empty. Will be-sent as-is (future versions of
110	this module might offer more options).	163	this module might offer more options).
111		164
		165	=item cookie_jar => $hash_ref
		166
		167	Passing this parameter enables (simplified) cookie-processing, loosely
		168	based on the original netscape specification.
		169
		170	The C<$hash_ref> must be an (initially empty) hash reference which will
		171	get updated automatically. It is possible to save the cookie_jar to
		172	persistent storage with something like JSON or Storable, but this is not
		173	recommended, as expiry times are currently being ignored.
		174
		175	Note that this cookie implementation is not of very high quality, nor
		176	meant to be complete. If you want complete cookie management you have to
		177	do that on your own. C<cookie_jar> is meant as a quick fix to get some
		178	cookie-using sites working. Cookies are a privacy disaster, do not use
		179	them unless required to.
		180
		181	=item tls_ctx => $scheme \| $tls_ctx
		182
		183	Specifies the AnyEvent::TLS context to be used for https connections. This
		184	parameter follows the same rules as the C<tls_ctx> parameter to
		185	L<AnyEvent::Handle>, but additionally, the two strings C<low> or
		186	C<high> can be specified, which give you a predefined low-security (no
		187	verification, highest compatibility) and high-security (CA and common-name
		188	verification) TLS context.
		189
		190	The default for this option is C<low>, which could be interpreted as "give
		191	me the page, no matter what".
		192
		193	=item on_header => $callback->($headers)
		194
		195	When specified, this callback will be called with the header hash as soon
		196	as headers have been successfully received from the remote server (not on
		197	locally-generated errors).
		198
		199	It has to return either true (in which case AnyEvent::HTTP will continue),
		200	or false, in which case AnyEvent::HTTP will cancel the download (and call
		201	the finish callback with an error code of C<598>).
		202
		203	This callback is useful, among other things, to quickly reject unwanted
		204	content, which, if it is supposed to be rare, can be faster than first
		205	doing a C<HEAD> request.
		206
		207	Example: cancel the request unless the content-type is "text/html".
		208
		209	on_header => sub {
		210	$_[0]{"content-type"} =~ /^text\/html\s*(?:;\|$)/
		211	},
		212
		213	=item on_body => $callback->($partial_body, $headers)
		214
		215	When specified, all body data will be passed to this callback instead of
		216	to the completion callback. The completion callback will get the empty
		217	string instead of the body data.
		218
		219	It has to return either true (in which case AnyEvent::HTTP will continue),
		220	or false, in which case AnyEvent::HTTP will cancel the download (and call
		221	the completion callback with an error code of C<598>).
		222
		223	This callback is useful when the data is too large to be held in memory
		224	(so the callback writes it to a file) or when only some information should
		225	be extracted, or when the body should be processed incrementally.
		226
		227	It is usually preferred over doing your own body handling via
		228	C<want_body_handle>, but in case of streaming APIs, where HTTP is
		229	only used to create a connection, C<want_body_handle> is the better
		230	alternative, as it allows you to install your own event handler, reducing
		231	resource usage.
		232
		233	=item want_body_handle => $enable
		234
		235	When enabled (default is disabled), the behaviour of AnyEvent::HTTP
		236	changes considerably: after parsing the headers, and instead of
		237	downloading the body (if any), the completion callback will be
		238	called. Instead of the C<$body> argument containing the body data, the
		239	callback will receive the L<AnyEvent::Handle> object associated with the
		240	connection. In error cases, C<undef> will be passed. When there is no body
		241	(e.g. status C<304>), the empty string will be passed.
		242
		243	The handle object might or might not be in TLS mode, might be connected to
		244	a proxy, be a persistent connection etc., and configured in unspecified
		245	ways. The user is responsible for this handle (it will not be used by this
		246	module anymore).
		247
		248	This is useful with some push-type services, where, after the initial
		249	headers, an interactive protocol is used (typical example would be the
		250	push-style twitter API which starts a JSON/XML stream).
		251
		252	If you think you need this, first have a look at C<on_body>, to see if
		253	that doesn't solve your problem in a better way.
		254
112	=back	255	=back
113		256
114	=back	257	Example: make a simple HTTP GET request for http://www.nethype.de/
		258
		259	http_request GET => "http://www.nethype.de/", sub {
		260	my ($body, $hdr) = @_;
		261	print "$body\n";
		262	};
		263
		264	Example: make a HTTP HEAD request on https://www.google.com/, use a
		265	timeout of 30 seconds.
		266
		267	http_request
		268	GET => "https://www.google.com",
		269	timeout => 30,
		270	sub {
		271	my ($body, $hdr) = @_;
		272	use Data::Dumper;
		273	print Dumper $hdr;
		274	}
		275	;
		276
		277	Example: make another simple HTTP GET request, but immediately try to
		278	cancel it.
		279
		280	my $request = http_request GET => "http://www.nethype.de/", sub {
		281	my ($body, $hdr) = @_;
		282	print "$body\n";
		283	};
		284
		285	undef $request;
115		286
116	=cut	287	=cut
117		288
		289	sub _slot_schedule;
		290	sub _slot_schedule($) {
		291	my $host = shift;
		292
		293	while ($CO_SLOT{$host}[0] < $MAX_PER_HOST) {
		294	if (my $cb = shift @{ $CO_SLOT{$host}[1] }) {
		295	# somebody wants that slot
		296	++$CO_SLOT{$host}[0];
		297	++$ACTIVE;
		298
		299	$cb->(AnyEvent::Util::guard {
		300	--$ACTIVE;
		301	--$CO_SLOT{$host}[0];
		302	_slot_schedule $host;
		303	});
		304	} else {
		305	# nobody wants the slot, maybe we can forget about it
		306	delete $CO_SLOT{$host} unless $CO_SLOT{$host}[0];
		307	last;
		308	}
		309	}
		310	}
		311
		312	# wait for a free slot on host, call callback
		313	sub _get_slot($$) {
		314	push @{ $CO_SLOT{$_[0]}[1] }, $_[1];
		315
		316	_slot_schedule $_[0];
		317	}
		318
		319	our $qr_nl = qr{\015?\012};
		320	our $qr_nlnl = qr{(?<![^\012])\015?\012};
		321
		322	our $TLS_CTX_LOW = { cache => 1, sslv2 => 1 };
		323	our $TLS_CTX_HIGH = { cache => 1, verify => 1, verify_peername => "https" };
		324
118	sub http_request($$$;@) {	325	sub http_request($$@) {
119	my $cb = pop;	326	my $cb = pop;
120	my ($method, $url, %arg) = @_;	327	my ($method, $url, %arg) = @_;
121		328
122	my %hdr;	329	my %hdr;
123		330
		331	$arg{tls_ctx} = $TLS_CTX_LOW if $arg{tls_ctx} eq "low" \|\| !exists $arg{tls_ctx};
		332	$arg{tls_ctx} = $TLS_CTX_HIGH if $arg{tls_ctx} eq "high";
		333
124	$method = uc $method;	334	$method = uc $method;
125		335
126	if (my $hdr = delete $arg{headers}) {	336	if (my $hdr = $arg{headers}) {
127	while (my ($k, $v) = each %$hdr) {	337	while (my ($k, $v) = each %$hdr) {
128	$hdr{lc $k} = $v;	338	$hdr{lc $k} = $v;
129	}	339	}
130	}	340	}
131		341
		342	my $recurse = exists $arg{recurse} ? delete $arg{recurse} : $MAX_RECURSE;
		343
		344	return $cb->(undef, { Status => 599, Reason => "Too many redirections", URL => $url })
		345	if $recurse < 0;
		346
132	my $proxy = $arg{proxy} \|\| $PROXY;	347	my $proxy = $arg{proxy} \|\| $PROXY;
133	my $timeout = $arg{timeout} \|\| $TIMEOUT;	348	my $timeout = $arg{timeout} \|\| $TIMEOUT;
134	my $recurse = exists $arg{recurse} ? $arg{recurse} : $MAX_RECURSE;
135		349
136	$hdr{"user-agent"} \|\|= $USERAGENT;	350	my ($uscheme, $uauthority, $upath, $query, $fragment) =
		351	$url =~ m\|(?:([^:/?#]+):)?(?://([^/?#]))?([^?#])(?:\?([^#]))?(?:#(.))?\|;
137		352
138	my ($host, $port, $path, $scheme);	353	$uscheme = lc $uscheme;
		354
		355	my $uport = $uscheme eq "http" ? 80
		356	: $uscheme eq "https" ? 443
		357	: return $cb->(undef, { Status => 599, Reason => "Only http and https URL schemes supported", URL => $url });
		358
		359	$uauthority =~ /^(?: .*\@ )? ([^\@:]+) (?: : (\d+) )?$/x
		360	or return $cb->(undef, { Status => 599, Reason => "Unparsable URL", URL => $url });
		361
		362	my $uhost = $1;
		363	$uport = $2 if defined $2;
		364
		365	$hdr{host} = defined $2 ? "$uhost:$2" : "$uhost";
		366
		367	$uhost =~ s/^\[(.*)\]$/$1/;
		368	$upath .= "?$query" if length $query;
		369
		370	$upath =~ s%^/?%/%;
		371
		372	# cookie processing
		373	if (my $jar = $arg{cookie_jar}) {
		374	%$jar = () if $jar->{version} != 1;
		375
		376	my @cookie;
		377
		378	while (my ($chost, $v) = each %$jar) {
		379	if ($chost =~ /^\./) {
		380	next unless $chost eq substr $uhost, -length $chost;
		381	} elsif ($chost =~ /\./) {
		382	next unless $chost eq $uhost;
		383	} else {
		384	next;
		385	}
		386
		387	while (my ($cpath, $v) = each %$v) {
		388	next unless $cpath eq substr $upath, 0, length $cpath;
		389
		390	while (my ($k, $v) = each %$v) {
		391	next if $uscheme ne "https" && exists $v->{secure};
		392	my $value = $v->{value};
		393	$value =~ s/([\\"])/\\$1/g;
		394	push @cookie, "$k=\"$value\"";
		395	}
		396	}
		397	}
		398
		399	$hdr{cookie} = join "; ", @cookie
		400	if @cookie;
		401	}
		402
		403	my ($rhost, $rport, $rscheme, $rpath); # request host, port, path
139		404
140	if ($proxy) {	405	if ($proxy) {
141	($host, $port, $scheme) = @$proxy;	406	($rpath, $rhost, $rport, $rscheme) = ($url, @$proxy);
142	$path = $url;	407
		408	$rscheme = "http" unless defined $rscheme;
		409
		410	# don't support https requests over https-proxy transport,
		411	# can't be done with tls as spec'ed, unless you double-encrypt.
		412	$rscheme = "http" if $uscheme eq "https" && $rscheme eq "https";
143	} else {	413	} else {
144	($scheme, my $authority, $path, my $query, my $fragment) =	414	($rhost, $rport, $rscheme, $rpath) = ($uhost, $uport, $uscheme, $upath);
145	$url =~ m\|(?:([^:/?#]+):)?(?://([^/?#]))?([^?#])(?:\?([^#]))?(?:#(.))?\|;
146
147	$port = $scheme eq "http" ? 80
148	: $scheme eq "https" ? 443
149	: croak "$url: only http and https URLs supported";
150
151	$authority =~ /^(?: .*\@ )? ([^\@:]+) (?: : (\d+) )?$/x
152	or croak "$authority: unparsable URL";
153
154	$host = $1;
155	$port = $2 if defined $2;
156
157	$host =~ s/^\[(.*)\]$/$1/;
158	$path .= "?$query" if length $query;
159
160	$path = "/" unless $path;
161
162	$hdr{host} = $host = lc $host;
163	}	415	}
164		416
165	$scheme = lc $scheme;	417	# leave out fragment and query string, just a heuristic
		418	$hdr{referer} \|\|= "$uscheme://$uauthority$upath" unless exists $hdr{referer};
		419	$hdr{"user-agent"} \|\|= $USERAGENT unless exists $hdr{"user-agent"};
166		420
167	my %state;
168
169	$state{body} = delete $arg{body};
170
171	$hdr{"content-length"} = length $state{body};	421	$hdr{"content-length"} = length $arg{body};
172		422
		423	my %state = (connect_guard => 1);
		424
		425	_get_slot $uhost, sub {
		426	$state{slot_guard} = shift;
		427
		428	return unless $state{connect_guard};
		429
173	$state{connect_guard} = AnyEvent::Socket::tcp_connect $host, $port, sub {	430	$state{connect_guard} = AnyEvent::Socket::tcp_connect $rhost, $rport, sub {
174	$state{fh} = shift	431	$state{fh} = shift
175	or return $cb->(undef, { Status => 599, Reason => "$!" });
176
177	delete $state{connect_guard}; # reduce memory usage, save a tree
178
179	# get handle
180	$state{handle} = new AnyEvent::Handle
181	fh => $state{fh},
182	($scheme eq "https" ? (tls => "connect") : ());
183
184	# limit the number of persistent connections
185	if ($KA_COUNT{$_[1]} < $MAX_PERSISTENT_PER_HOST) {
186	++$KA_COUNT{$_[1]};
187	$state{handle}{ka_count_guard} = AnyEvent::Util::guard { --$KA_COUNT{$_[1]} };
188	$hdr{connection} = "keep-alive";
189	delete $hdr{connection}; # keep-alive not yet supported
190	} else {
191	delete $hdr{connection};
192	}
193
194	# (re-)configure handle
195	$state{handle}->timeout ($timeout);
196	$state{handle}->on_error (sub {
197	%state = ();
198	$cb->(undef, { Status => 599, Reason => "$!" });
199	});
200	$state{handle}->on_eof (sub {
201	%state = ();
202	$cb->(undef, { Status => 599, Reason => "unexpected end-of-file" });
203	});
204
205	# send request
206	$state{handle}->push_write (
207	"$method $path HTTP/1.0\015\012"
208	. (join "", map "$_: $hdr{$_}\015\012", keys %hdr)
209	. "\015\012"
210	. (delete $state{body})
211	);
212
213	%hdr = (); # reduce memory usage, save a kitten
214
215	# status line
216	$state{handle}->push_read (line => qr/\015?\012/, sub {
217	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) \s+ ([^\015\012]+)/ix
218	or return (%state = (), $cb->(undef, { Status => 599, Reason => "invalid server response ($_[1])" }));
219
220	my %hdr = ( # response headers
221	HTTPVersion => ",$1",
222	Status => ",$2",
223	Reason => ",$3",
224	);
225
226	# headers, could be optimized a bit
227	$state{handle}->unshift_read (line => qr/\015?\012\015?\012/, sub {
228	for ("$_[1]\012") {
229	# we support spaces in field names, as lotus domino
230	# creates them.
231	$hdr{lc $1} .= ",$2"
232	while /\G
233	([^:\000-\037]+):
234	[\011\040]*
235	((?: [^\015\012]+ \| \015?\012[\011\040] )*)
236	\015?\012
237	/gxc;
238
239	/\G$/
240	or return $cb->(undef, { Status => 599, Reason => "garbled response headers" });
241	}	432	or do {
242		433	my $err = "$!";
243	substr $_, 0, 1, ""
244	for values %hdr;
245
246	if ($method eq "HEAD") {
247	%state = ();	434	%state = ();
248	$cb->(undef, \%hdr);	435	return $cb->(undef, { Status => 599, Reason => $err, URL => $url });
		436	};
		437
		438	pop; # free memory, save a tree
		439
		440	return unless delete $state{connect_guard};
		441
		442	# get handle
		443	$state{handle} = new AnyEvent::Handle
		444	fh => $state{fh},
		445	timeout => $timeout,
		446	peername => $rhost,
		447	tls_ctx => $arg{tls_ctx};
		448
		449	# limit the number of persistent connections
		450	# keepalive not yet supported
		451	if ($KA_COUNT{$_[1]} < $MAX_PERSISTENT_PER_HOST) {
		452	++$KA_COUNT{$_[1]};
		453	$state{handle}{ka_count_guard} = AnyEvent::Util::guard {
		454	--$KA_COUNT{$_[1]}
		455	};
		456	$hdr{connection} = "keep-alive";
249	} else {	457	} else {
250	if (exists $hdr{"content-length"}) {	458	delete $hdr{connection};
251	$_[0]->unshift_read (chunk => $hdr{"content-length"}, sub {	459	}
252	# could cache persistent connection now	460
253	if ($hdr{connection} =~ /\bkeep-alive\b/i) {	461	# (re-)configure handle
254	# but we don't, due to misdesigns, this is annoyingly complex	462	$state{handle}->on_error (sub {
		463	%state = ();
		464	$cb->(undef, { Status => 599, Reason => $_[2], URL => $url });
		465	});
		466	$state{handle}->on_eof (sub {
		467	%state = ();
		468	$cb->(undef, { Status => 599, Reason => "Unexpected end-of-file", URL => $url });
		469	});
		470
		471	$state{handle}->starttls ("connect") if $rscheme eq "https";
		472
		473	# handle actual, non-tunneled, request
		474	my $handle_actual_request = sub {
		475	$state{handle}->starttls ("connect") if $uscheme eq "https" && !exists $state{handle}{tls};
		476
		477	# send request
		478	$state{handle}->push_write (
		479	"$method $rpath HTTP/1.0\015\012"
		480	. (join "", map "\u$_: $hdr{$_}\015\012", grep defined $hdr{$_}, keys %hdr)
		481	. "\015\012"
		482	. (delete $arg{body})
		483	);
		484
		485	%hdr = (); # reduce memory usage, save a kitten
		486
		487	# status line
		488	$state{handle}->push_read (line => $qr_nl, sub {
		489	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix
		490	or return (%state = (), $cb->(undef, { Status => 599, Reason => "Invalid server response ($_[1])", URL => $url }));
		491
		492	my %hdr = ( # response headers
		493	HTTPVersion => ",$1",
		494	Status => ",$2",
		495	Reason => ",$3",
		496	URL => ",$url"
		497	);
		498
		499	# headers, could be optimized a bit
		500	$state{handle}->unshift_read (line => $qr_nlnl, sub {
		501	for ("$_[1]") {
		502	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
		503
		504	# things seen, not parsed:
		505	# p3pP="NON CUR OTPi OUR NOR UNI"
		506
		507	$hdr{lc $1} .= ",$2"
		508	while /\G
		509	([^:\000-\037]*):
		510	[\011\040]*
		511	((?: [^\012]+ \| \012[\011\040] )*)
		512	\012
		513	/gxc;
		514
		515	/\G$/
		516	or return (%state = (), $cb->(undef, { Status => 599, Reason => "Garbled response headers", URL => $url }));
		517	}
		518
		519	substr $_, 0, 1, ""
		520	for values %hdr;
		521
		522	# redirect handling
		523	# microsoft and other shitheads don't give a shit for following standards,
		524	# try to support some common forms of broken Location headers.
		525	if ($hdr{location} !~ /^(?: $ \| [^:\/?\#]+ : )/x) {
		526	$hdr{location} =~ s/^\.\/+//;
		527
		528	my $url = "$rscheme://$uhost:$uport";
		529
		530	unless ($hdr{location} =~ s/^\///) {
		531	$url .= $upath;
		532	$url =~ s/\/[^\/]*$//;
255	};	533	}
256		534
		535	$hdr{location} = "$url/$hdr{location}";
		536	}
		537
		538	my $redirect;
		539
		540	if ($recurse) {
		541	if ($hdr{Status} =~ /^30[12]$/ && $method ne "POST") {
		542	# apparently, mozilla et al. just change POST to GET here
		543	# more research is needed before we do the same
		544	$redirect = 1;
		545	} elsif ($hdr{Status} == 303) {
		546	# even http/1.1 is unclear on how to mutate the method
		547	$method = "GET" unless $method eq "HEAD";
		548	$redirect = 1;
		549	} elsif ($hdr{Status} == 307 && $method =~ /^(?:GET\|HEAD)$/) {
		550	$redirect = 1;
		551	}
		552	}
		553
		554	my $finish = sub {
		555	$state{handle}->destroy if $state{handle};
257	%state = ();	556	%state = ();
		557
		558	# set-cookie processing
		559	if ($arg{cookie_jar}) {
		560	for ($_[1]{"set-cookie"}) {
		561	# parse NAME=VALUE
		562	my @kv;
		563
		564	while (/\G\s* ([^=;,[:space:]]+) \s=\s (?: "((?:[^\\"]+\|\\.))" \| ([^=;,[:space:]]) )/gcxs) {
		565	my $name = $1;
		566	my $value = $3;
		567
		568	unless ($value) {
		569	$value = $2;
		570	$value =~ s/\\(.)/$1/gs;
		571	}
		572
		573	push @kv, $name => $value;
		574
		575	last unless /\G\s*;/gc;
		576	}
		577
		578	last unless @kv;
		579
		580	my $name = shift @kv;
		581	my %kv = (value => shift @kv, @kv);
		582
		583	my $cdom;
		584	my $cpath = (delete $kv{path}) \|\| "/";
		585
		586	if (exists $kv{domain}) {
		587	$cdom = delete $kv{domain};
		588
		589	$cdom =~ s/^\.?/./; # make sure it starts with a "."
		590
		591	next if $cdom =~ /\.$/;
		592
		593	# this is not rfc-like and not netscape-like. go figure.
		594	my $ndots = $cdom =~ y/.//;
		595	next if $ndots < ($cdom =~ /\.[^.][^.]\.[^.][^.]$/ ? 3 : 2);
		596	} else {
		597	$cdom = $uhost;
		598	}
		599
		600	# store it
		601	$arg{cookie_jar}{version} = 1;
		602	$arg{cookie_jar}{$cdom}{$cpath}{$name} = \%kv;
		603
		604	redo if /\G\s*,/gc;
		605	}
		606	}
		607
		608	if ($redirect && exists $hdr{location}) {
		609	# we ignore any errors, as it is very common to receive
		610	# Content-Length != 0 but no actual body
		611	# we also access %hdr, as $_[1] might be an erro
		612	http_request ($method => $hdr{location}, %arg, recurse => $recurse - 1, $cb);
		613	} else {
258	$cb->($_[1], \%hdr);	614	$cb->($_[0], $_[1]);
		615	}
259	});	616	};
		617
		618	my $len = $hdr{"content-length"};
		619
		620	if (!$redirect && $arg{on_header} && !$arg{on_header}(\%hdr)) {
		621	$finish->(undef, { Status => 598, Reason => "Request cancelled by on_header", URL => $url });
		622	} elsif (
		623	$hdr{Status} =~ /^(?:1..\|[23]04)$/
		624	or $method eq "HEAD"
		625	or (defined $len && !$len)
		626	) {
		627	# no body
		628	$finish->("", \%hdr);
		629	} else {
		630	# body handling, four different code paths
		631	# for want_body_handle, on_body (2x), normal (2x)
		632	# we might read too much here, but it does not matter yet (no pers. connections)
		633	if (!$redirect && $arg{want_body_handle}) {
		634	$_[0]->on_eof (undef);
		635	$_[0]->on_error (undef);
		636	$_[0]->on_read (undef);
		637
		638	$finish->(delete $state{handle}, \%hdr);
		639
		640	} elsif ($arg{on_body}) {
		641	$_[0]->on_error (sub { $finish->(undef, { Status => 599, Reason => $_[2], URL => $url }) });
		642	if ($len) {
		643	$_[0]->on_eof (undef);
		644	$_[0]->on_read (sub {
		645	$len -= length $_[0]{rbuf};
		646
		647	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
		648	or $finish->(undef, { Status => 598, Reason => "Request cancelled by on_body", URL => $url });
		649
		650	$len > 0
		651	or $finish->("", \%hdr);
		652	});
		653	} else {
		654	$_[0]->on_eof (sub {
		655	$finish->("", \%hdr);
		656	});
		657	$_[0]->on_read (sub {
		658	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
		659	or $finish->(undef, { Status => 598, Reason => "Request cancelled by on_body", URL => $url });
		660	});
		661	}
		662	} else {
		663	$_[0]->on_eof (undef);
		664
		665	if ($len) {
		666	$_[0]->on_error (sub { $finish->(undef, { Status => 599, Reason => $_[2], URL => $url }) });
		667	$_[0]->on_read (sub {
		668	$finish->((substr delete $_[0]{rbuf}, 0, $len, ""), \%hdr)
		669	if $len <= length $_[0]{rbuf};
		670	});
		671	} else {
		672	$_[0]->on_error (sub {
		673	$! == Errno::EPIPE \|\| !$!
		674	? $finish->(delete $_[0]{rbuf}, \%hdr)
		675	: $finish->(undef, { Status => 599, Reason => $_[2], URL => $url });
		676	});
		677	$_[0]->on_read (sub { });
		678	}
		679	}
		680	}
		681	});
		682	});
		683	};
		684
		685	# now handle proxy-CONNECT method
		686	if ($proxy && $uscheme eq "https") {
		687	# oh dear, we have to wrap it into a connect request
		688
		689	# maybe re-use $uauthority with patched port?
		690	$state{handle}->push_write ("CONNECT $uhost:$uport HTTP/1.0\015\012Host: $uhost\015\012\015\012");
		691	$state{handle}->push_read (line => $qr_nlnl, sub {
		692	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix
		693	or return (%state = (), $cb->(undef, { Status => 599, Reason => "Invalid proxy connect response ($_[1])", URL => $url }));
		694
		695	if ($2 == 200) {
		696	$rpath = $upath;
		697	&$handle_actual_request;
260	} else {	698	} else {
261	# too bad, need to read until we get an error or EOF,
262	# no way to detect winged data.
263	$_[0]->on_error (sub {
264	%state = ();	699	%state = ();
265	$cb->($_[0]{rbuf}, \%hdr);	700	$cb->(undef, { Status => $2, Reason => $3, URL => $url });
266	});
267	$_[0]->on_eof (undef);
268	$_[0]->on_read (sub { });
269	}	701	}
270	}	702	});
		703	} else {
		704	&$handle_actual_request;
271	});	705	}
272	});	706
273	}, sub {	707	}, $arg{on_prepare} \|\| sub { $timeout };
274	$timeout
275	};	708	};
276		709
277	defined wantarray && AnyEvent::Util::guard { %state = () }	710	defined wantarray && AnyEvent::Util::guard { %state = () }
278	}	711	}
279		712
280	sub http_get($$;@) {	713	sub http_get($@) {
281	unshift @_, "GET";	714	unshift @_, "GET";
282	&http_request	715	&http_request
283	}	716	}
284		717
285	sub http_head($$;@) {	718	sub http_head($@) {
286	unshift @_, "HEAD";	719	unshift @_, "HEAD";
287	&http_request	720	&http_request
288	}	721	}
289		722
290	sub http_post($$$;@) {	723	sub http_post($$@) {
		724	my $url = shift;
291	unshift @_, "POST", "body";	725	unshift @_, "POST", $url, "body";
292	&http_request	726	&http_request
293	}	727	}
294		728
		729	=back
		730
295	=head2 GLOBAL FUNCTIONS AND VARIABLES	731	=head2 GLOBAL FUNCTIONS AND VARIABLES
296		732
297	=over 4	733	=over 4
298		734
299	=item AnyEvent::HTTP::set_proxy "proxy-url"	735	=item AnyEvent::HTTP::set_proxy "proxy-url"
…		…
306	The default value for the C<recurse> request parameter (default: C<10>).	742	The default value for the C<recurse> request parameter (default: C<10>).
307		743
308	=item $AnyEvent::HTTP::USERAGENT	744	=item $AnyEvent::HTTP::USERAGENT
309		745
310	The default value for the C<User-Agent> header (the default is	746	The default value for the C<User-Agent> header (the default is
311	C<Mozilla/5.0 (compatible; AnyEvent::HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>).	747	C<Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>).
312		748
313	=item $AnyEvent::HTTP::MAX_PERSISTENT	749	=item $AnyEvent::HTTP::MAX_PER_HOST
314		750
315	The maximum number of persistent connections to keep open (default: 8).	751	The maximum number of concurrent connections to the same host (identified
		752	by the hostname). If the limit is exceeded, then the additional requests
		753	are queued until previous connections are closed.
316		754
317	Not implemented currently.	755	The default value for this is C<4>, and it is highly advisable to not
		756	increase it.
318		757
319	=item $AnyEvent::HTTP::PERSISTENT_TIMEOUT	758	=item $AnyEvent::HTTP::ACTIVE
320		759
321	The maximum time to cache a persistent connection, in seconds (default: 2).	760	The number of active connections. This is not the number of currently
322		761	running requests, but the number of currently open and non-idle TCP
323	Not implemented currently.	762	connections. This number of can be useful for load-leveling.
324		763
325	=back	764	=back
326		765
327	=cut	766	=cut
328		767
…		…
337		776
338	L<AnyEvent>.	777	L<AnyEvent>.
339		778
340	=head1 AUTHOR	779	=head1 AUTHOR
341		780
342	Marc Lehmann <schmorp@schmorp.de>	781	Marc Lehmann <schmorp@schmorp.de>
343	http://home.schmorp.de/	782	http://home.schmorp.de/
		783
		784	With many thanks to Дмитрий Шалашов, who provided countless
		785	testcases and bugreports.
344		786
345	=cut	787	=cut
346		788
347	1	789	1
348		790

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Comparing AnyEvent-HTTP/HTTP.pm (file contents): Revision 1.4 by root, Wed Jun 4 11:59:22 2008 UTC vs. Revision 1.50 by root, Tue Aug 11 13:20:42 2009 UTC

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Comparing AnyEvent-HTTP/HTTP.pm (file contents):
Revision 1.4 by root, Wed Jun 4 11:59:22 2008 UTC vs.
Revision 1.50 by root, Tue Aug 11 13:20:42 2009 UTC