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Comparing AnyEvent-HTTP/HTTP.pm (file contents):
Revision 1.72 by root, Fri Dec 31 20:59:19 2010 UTC vs.
Revision 1.103 by root, Thu Feb 24 12:13:11 2011 UTC

…		…
15	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
16	run a supported event loop.	16	run a supported event loop.
17		17
18	This module implements a simple, stateless and non-blocking HTTP	18	This module implements a simple, stateless and non-blocking HTTP
19	client. It supports GET, POST and other request methods, cookies and more,	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	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	21	automatically limits the number of connections to the values specified in
22	the RFC.	22	the RFC.
23		23
24	It should generally be a "good client" that is enough for most HTTP	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	25	tasks. Simple tasks should be simple, but complex tasks should still be
…		…
36		36
37	=cut	37	=cut
38		38
39	package AnyEvent::HTTP;	39	package AnyEvent::HTTP;
40		40
41	use strict;	41	use common::sense;
42	no warnings;
43		42
44	use Errno ();	43	use Errno ();
45		44
46	use AnyEvent 5.0 ();	45	use AnyEvent 5.0 ();
47	use AnyEvent::Util ();	46	use AnyEvent::Util ();
48	use AnyEvent::Handle ();	47	use AnyEvent::Handle ();
49		48
50	use base Exporter::;	49	use base Exporter::;
51		50
52	our $VERSION = '1.5';	51	our $VERSION = '2.1';
53		52
54	our @EXPORT = qw(http_get http_post http_head http_request);	53	our @EXPORT = qw(http_get http_post http_head http_request);
55		54
56	our $USERAGENT = "Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)";	55	our $USERAGENT = "Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)";
57	our $MAX_RECURSE = 10;	56	our $MAX_RECURSE = 10;
58	our $MAX_PERSISTENT = 8;
59	our $PERSISTENT_TIMEOUT = 2;	57	our $PERSISTENT_TIMEOUT = 3;
60	our $TIMEOUT = 300;	58	our $TIMEOUT = 300;
61		59	our $MAX_PER_HOST = 4; # changing this is evil
62	# changing these is evil
63	our $MAX_PERSISTENT_PER_HOST = 0;
64	our $MAX_PER_HOST = 4;
65		60
66	our $PROXY;	61	our $PROXY;
67	our $ACTIVE = 0;	62	our $ACTIVE = 0;
68		63
69	my %KA_COUNT; # number of open keep-alive connections per host	64	my %KA_CACHE; # indexed by uhost currently, points to [$handle...] array
70	my %CO_SLOT; # number of open connections, and wait queue, per host	65	my %CO_SLOT; # number of open connections, and wait queue, per host
71		66
72	=item http_get $url, key => value..., $cb->($data, $headers)	67	=item http_get $url, key => value..., $cb->($data, $headers)
73		68
74	Executes an HTTP-GET request. See the http_request function for details on	69	Executes an HTTP-GET request. See the http_request function for details on
…		…
122		117
123	If the server sends a header multiple times, then their contents will be	118	If the server sends a header multiple times, then their contents will be
124	joined together with a comma (C<,>), as per the HTTP spec.	119	joined together with a comma (C<,>), as per the HTTP spec.
125		120
126	If an internal error occurs, such as not being able to resolve a hostname,	121	If an internal error occurs, such as not being able to resolve a hostname,
127	then C<$data> will be C<undef>, C<< $headers->{Status} >> will be C<59x>	122	then C<$data> will be C<undef>, C<< $headers->{Status} >> will be
128	(usually C<599>) and the C<Reason> pseudo-header will contain an error	123	C<590>-C<599> and the C<Reason> pseudo-header will contain an error
129	message.	124	message. Currently the following status codes are used:
		125
		126	=over 4
		127
		128	=item 595 - errors during connection etsbalishment, proxy handshake.
		129
		130	=item 596 - errors during TLS negotiation, request sending and header processing.
		131
		132	=item 597 - errors during body receiving or processing.
		133
		134	=item 598 - user aborted request via C<on_header> or C<on_body>.
		135
		136	=item 599 - other, usually nonretryable, errors (garbled URL etc.).
		137
		138	=back
130		139
131	A typical callback might look like this:	140	A typical callback might look like this:
132		141
133	sub {	142	sub {
134	my ($body, $hdr) = @_;	143	my ($body, $hdr) = @_;
…		…
156	C<Host:>, C<Content-Length:>, C<Connection:> and C<Cookie:> headers and	165	C<Host:>, C<Content-Length:>, C<Connection:> and C<Cookie:> headers and
157	will provide defaults at least for C<TE:>, C<Referer:> and C<User-Agent:>	166	will provide defaults at least for C<TE:>, C<Referer:> and C<User-Agent:>
158	(this can be suppressed by using C<undef> for these headers in which case	167	(this can be suppressed by using C<undef> for these headers in which case
159	they won't be sent at all).	168	they won't be sent at all).
160		169
		170	You really should provide your own C<User-Agent:> header value that is
		171	appropriate for your program - I wouldn't be surprised if the default
		172	AnyEvent string gets blocked by webservers sooner or later.
		173
161	=item timeout => $seconds	174	=item timeout => $seconds
162		175
163	The time-out to use for various stages - each connect attempt will reset	176	The time-out to use for various stages - each connect attempt will reset
164	the timeout, as will read or write activity, i.e. this is not an overall	177	the timeout, as will read or write activity, i.e. this is not an overall
165	timeout.	178	timeout.
166		179
167	Default timeout is 5 minutes.	180	Default timeout is 5 minutes.
168		181
169	=item proxy => [$host, $port[, $scheme]] or undef	182	=item proxy => [$host, $port[, $scheme]] or undef
170		183
171	Use the given http proxy for all requests. If not specified, then the	184	Use the given http proxy for all requests, or no proxy if C<undef> is
172	default proxy (as specified by C<$ENV{http_proxy}>) is used.	185	used.
173		186
174	C<$scheme> must be either missing, C<http> for HTTP or C<https> for	187	C<$scheme> must be either missing or must be C<http> for HTTP.
175	HTTPS.	188
		189	If not specified, then the default proxy is used (see
		190	C<AnyEvent::HTTP::set_proxy>).
176		191
177	=item body => $string	192	=item body => $string
178		193
179	The request body, usually empty. Will be sent as-is (future versions of	194	The request body, usually empty. Will be sent as-is (future versions of
180	this module might offer more options).	195	this module might offer more options).
…		…
182	=item cookie_jar => $hash_ref	197	=item cookie_jar => $hash_ref
183		198
184	Passing this parameter enables (simplified) cookie-processing, loosely	199	Passing this parameter enables (simplified) cookie-processing, loosely
185	based on the original netscape specification.	200	based on the original netscape specification.
186		201
187	The C<$hash_ref> must be an (initially empty) hash reference which will	202	The C<$hash_ref> must be an (initially empty) hash reference which
188	get updated automatically. It is possible to save the cookie jar to	203	will get updated automatically. It is possible to save the cookie jar
189	persistent storage with something like JSON or Storable, but this is not	204	to persistent storage with something like JSON or Storable - see the
190	recommended, as session-only cookies might survive longer than expected.	205	C<AnyEvent::HTTP::cookie_jar_expire> function if you wish to remove
		206	expired or session-only cookies, and also for documentation on the format
		207	of the cookie jar.
191		208
192	Note that this cookie implementation is not meant to be complete. If	209	Note that this cookie implementation is not meant to be complete. If
193	you want complete cookie management you have to do that on your	210	you want complete cookie management you have to do that on your
194	own. C<cookie_jar> is meant as a quick fix to get some cookie-using sites	211	own. C<cookie_jar> is meant as a quick fix to get most cookie-using sites
195	working. Cookies are a privacy disaster, do not use them unless required	212	working. Cookies are a privacy disaster, do not use them unless required
196	to.	213	to.
197		214
198	When cookie processing is enabled, the C<Cookie:> and C<Set-Cookie:>	215	When cookie processing is enabled, the C<Cookie:> and C<Set-Cookie:>
199	headers will be set and handled by this module, otherwise they will be	216	headers will be set and handled by this module, otherwise they will be
…		…
208	verification, highest compatibility) and high-security (CA and common-name	225	verification, highest compatibility) and high-security (CA and common-name
209	verification) TLS context.	226	verification) TLS context.
210		227
211	The default for this option is C<low>, which could be interpreted as "give	228	The default for this option is C<low>, which could be interpreted as "give
212	me the page, no matter what".	229	me the page, no matter what".
		230
		231	See also the C<sessionid> parameter.
		232
		233	=item session => $string
		234
		235	The module might reuse connections to the same host internally. Sometimes
		236	(e.g. when using TLS), you do not want to reuse connections from other
		237	sessions. This can be achieved by setting this parameter to some unique
		238	ID (such as the address of an object storing your state data, or the TLS
		239	context) - only connections using the same unique ID will be reused.
213		240
214	=item on_prepare => $callback->($fh)	241	=item on_prepare => $callback->($fh)
215		242
216	In rare cases you need to "tune" the socket before it is used to	243	In rare cases you need to "tune" the socket before it is used to
217	connect (for exmaple, to bind it on a given IP address). This parameter	244	connect (for exmaple, to bind it on a given IP address). This parameter
…		…
287	called. Instead of the C<$body> argument containing the body data, the	314	called. Instead of the C<$body> argument containing the body data, the
288	callback will receive the L<AnyEvent::Handle> object associated with the	315	callback will receive the L<AnyEvent::Handle> object associated with the
289	connection. In error cases, C<undef> will be passed. When there is no body	316	connection. In error cases, C<undef> will be passed. When there is no body
290	(e.g. status C<304>), the empty string will be passed.	317	(e.g. status C<304>), the empty string will be passed.
291		318
292	The handle object might or might not be in TLS mode, might be connected to	319	The handle object might or might not be in TLS mode, might be connected
293	a proxy, be a persistent connection etc., and configured in unspecified	320	to a proxy, be a persistent connection, use chunked transfer encoding
294	ways. The user is responsible for this handle (it will not be used by this	321	etc., and configured in unspecified ways. The user is responsible for this
295	module anymore).	322	handle (it will not be used by this module anymore).
296		323
297	This is useful with some push-type services, where, after the initial	324	This is useful with some push-type services, where, after the initial
298	headers, an interactive protocol is used (typical example would be the	325	headers, an interactive protocol is used (typical example would be the
299	push-style twitter API which starts a JSON/XML stream).	326	push-style twitter API which starts a JSON/XML stream).
300		327
301	If you think you need this, first have a look at C<on_body>, to see if	328	If you think you need this, first have a look at C<on_body>, to see if
302	that doesn't solve your problem in a better way.	329	that doesn't solve your problem in a better way.
		330
		331	=item persistent => $boolean
		332
		333	Try to create/reuse a persistent connection. When this flag is set
		334	(default: true for idempotent requests, false for all others), then
		335	C<http_request> tries to re-use an existing (previously-created)
		336	persistent connection to the host and, failing that, tries to create a new
		337	one.
		338
		339	Requests failing in certain ways will be automatically retried once, which
		340	is dangerous for non-idempotent requests, which is why it defaults to off
		341	for them. The reason for this is because the bozos who designed HTTP/1.1
		342	made it impossible to distinguish between a fatal error and a normal
		343	connection timeout, so you never know whether there was a problem with
		344	your request or not.
		345
		346	When reusing an existent connection, many parameters (such as TLS context)
		347	will be ignored. See the C<session> parameter for a workaround.
		348
		349	=item keepalive => $boolean
		350
		351	Only used when C<persistent> is also true. This parameter decides whether
		352	C<http_request> tries to handshake a HTTP/1.0-style keep-alive connection
		353	(as opposed to only a HTTP/1.1 persistent connection).
		354
		355	The default is true, except when using a proxy, in which case it defaults
		356	to false, as HTTP/1.0 proxies cannot support this in a meaningful way.
		357
		358	=item handle_params => { key => value ... }
		359
		360	The key-value pairs in this hash will be passed to any L<AnyEvent::Handle>
		361	constructor that is called - not all requests will create a handle, and
		362	sometimes more than one is created, so this parameter is only good for
		363	setting hints.
		364
		365	Example: set the maximum read size to 4096, to potentially conserve memory
		366	at the cost of speed.
		367
		368	handle_params => {
		369	max_read_size => 4096,
		370	},
303		371
304	=back	372	=back
305		373
306	Example: do a simple HTTP GET request for http://www.nethype.de/ and print	374	Example: do a simple HTTP GET request for http://www.nethype.de/ and print
307	the response body.	375	the response body.
…		…
314	Example: do a HTTP HEAD request on https://www.google.com/, use a	382	Example: do a HTTP HEAD request on https://www.google.com/, use a
315	timeout of 30 seconds.	383	timeout of 30 seconds.
316		384
317	http_request	385	http_request
318	GET => "https://www.google.com",	386	GET => "https://www.google.com",
		387	headers => { "user-agent" => "MySearchClient 1.0" },
319	timeout => 30,	388	timeout => 30,
320	sub {	389	sub {
321	my ($body, $hdr) = @_;	390	my ($body, $hdr) = @_;
322	use Data::Dumper;	391	use Data::Dumper;
323	print Dumper $hdr;	392	print Dumper $hdr;
…		…
333	};	402	};
334		403
335	undef $request;	404	undef $request;
336		405
337	=cut	406	=cut
		407
		408	#############################################################################
		409	# wait queue/slots
338		410
339	sub _slot_schedule;	411	sub _slot_schedule;
340	sub _slot_schedule($) {	412	sub _slot_schedule($) {
341	my $host = shift;	413	my $host = shift;
342		414
…		…
364	push @{ $CO_SLOT{$_[0]}[1] }, $_[1];	436	push @{ $CO_SLOT{$_[0]}[1] }, $_[1];
365		437
366	_slot_schedule $_[0];	438	_slot_schedule $_[0];
367	}	439	}
368		440
		441	#############################################################################
		442	# cookie handling
		443
		444	# expire cookies
		445	sub cookie_jar_expire($;$) {
		446	my ($jar, $session_end) = @_;
		447
		448	%$jar = () if $jar->{version} != 1;
		449
		450	my $anow = AE::now;
		451
		452	while (my ($chost, $paths) = each %$jar) {
		453	next unless ref $paths;
		454
		455	while (my ($cpath, $cookies) = each %$paths) {
		456	while (my ($cookie, $kv) = each %$cookies) {
		457	if (exists $kv->{_expires}) {
		458	delete $cookies->{$cookie}
		459	if $anow > $kv->{_expires};
		460	} elsif ($session_end) {
		461	delete $cookies->{$cookie};
		462	}
		463	}
		464
		465	delete $paths->{$cpath}
		466	unless %$cookies;
		467	}
		468
		469	delete $jar->{$chost}
		470	unless %$paths;
		471	}
		472	}
		473
369	# extract cookies from jar	474	# extract cookies from jar
370	sub cookie_jar_extract($$$$) {	475	sub cookie_jar_extract($$$$) {
371	my ($jar, $uscheme, $uhost, $upath) = @_;	476	my ($jar, $scheme, $host, $path) = @_;
372		477
373	%$jar = () if $jar->{version} != 1;	478	%$jar = () if $jar->{version} != 1;
374		479
375	my @cookies;	480	my @cookies;
376		481
377	while (my ($chost, $paths) = each %$jar) {	482	while (my ($chost, $paths) = each %$jar) {
378	next unless ref $paths;	483	next unless ref $paths;
379		484
380	if ($chost =~ /^\./) {	485	if ($chost =~ /^\./) {
381	next unless $chost eq substr $uhost, -length $chost;	486	next unless $chost eq substr $host, -length $chost;
382	} elsif ($chost =~ /\./) {	487	} elsif ($chost =~ /\./) {
383	next unless $chost eq $uhost;	488	next unless $chost eq $host;
384	} else {	489	} else {
385	next;	490	next;
386	}	491	}
387		492
388	while (my ($cpath, $cookies) = each %$paths) {	493	while (my ($cpath, $cookies) = each %$paths) {
389	next unless $cpath eq substr $upath, 0, length $cpath;	494	next unless $cpath eq substr $path, 0, length $cpath;
390		495
391	while (my ($cookie, $kv) = each %$cookies) {	496	while (my ($cookie, $kv) = each %$cookies) {
392	next if $uscheme ne "https" && exists $kv->{secure};	497	next if $scheme ne "https" && exists $kv->{secure};
393		498
394	if (exists $kv->{expires}) {	499	if (exists $kv->{_expires} and AE::now > $kv->{_expires}) {
395	if (AE::now > parse_date ($kv->{expires})) {
396	delete $cookies->{$cookie};	500	delete $cookies->{$cookie};
397	next;	501	next;
398	}
399	}	502	}
400		503
401	my $value = $kv->{value};	504	my $value = $kv->{value};
402		505
403	if ($value =~ /[=;,[:space:]]/) {	506	if ($value =~ /[=;,[:space:]]/) {
…		…
412		515
413	\@cookies	516	\@cookies
414	}	517	}
415		518
416	# parse set_cookie header into jar	519	# parse set_cookie header into jar
417	sub cookie_jar_set_cookie($$) {	520	sub cookie_jar_set_cookie($$$$) {
418	my ($jar, $set_cookie) = @_;	521	my ($jar, $set_cookie, $host, $date) = @_;
		522
		523	my $anow = int AE::now;
		524	my $snow; # server-now
419		525
420	for ($set_cookie) {	526	for ($set_cookie) {
421	# parse NAME=VALUE	527	# parse NAME=VALUE
422	my @kv;	528	my @kv;
423		529
		530	# expires is not http-compliant in the original cookie-spec,
		531	# we support the official date format and some extensions
424	while (	532	while (
425	m{	533	m{
426	\G\s*	534	\G\s*
427	(?:	535	(?:
428	expires \s*=\s* ([A-Z][a-z][a-z],\ [^,;]+)	536	expires \s*=\s* ([A-Z][a-z][a-z]+,\ [^,;]+)
429	| ([^=;,[:space:]]+) \s*=\s* (?: "((?:[^\\"]+|\\.)*)" | ([^=;,[:space:]]*) )	537	| ([^=;,[:space:]]+) (?: \s*=\s* (?: "((?:[^\\"]+|\\.)*)" | ([^;,[:space:]]*) ) )?
430	)	538	)
431	}gcxsi	539	}gcxsi
432	) {	540	) {
433	my $name = $2;	541	my $name = $2;
434	my $value = $4;	542	my $value = $4;
435		543
436	unless (defined $name) {	544	if (defined $1) {
437	# expires	545	# expires
438	$name = "expires";	546	$name = "expires";
439	$value = $1;	547	$value = $1;
440	} elsif (!defined $value) {	548	} elsif (defined $3) {
441	# quoted	549	# quoted
442	$value = $3;	550	$value = $3;
443	$value =~ s/\\(.)/$1/gs;	551	$value =~ s/\\(.)/$1/gs;
444	}	552	}
445		553
446	push @kv, lc $name, $value;	554	push @kv, @kv ? lc $name : $name, $value;
447		555
448	last unless /\G\s*;/gc;	556	last unless /\G\s*;/gc;
449	}	557	}
450		558
451	last unless @kv;	559	last unless @kv;
452		560
453	my $name = shift @kv;	561	my $name = shift @kv;
454	my %kv = (value => shift @kv, @kv);	562	my %kv = (value => shift @kv, @kv);
455		563
456	$kv{expires} ||= format_date (AE::now + $kv{"max-age"})
457	if exists $kv{"max-age"};	564	if (exists $kv{"max-age"}) {
		565	$kv{_expires} = $anow + delete $kv{"max-age"};
		566	} elsif (exists $kv{expires}) {
		567	$snow ||= parse_date ($date) || $anow;
		568	$kv{_expires} = $anow + (parse_date (delete $kv{expires}) - $snow);
		569	} else {
		570	delete $kv{_expires};
		571	}
458		572
459	my $cdom;	573	my $cdom;
460	my $cpath = (delete $kv{path}) || "/";	574	my $cpath = (delete $kv{path}) || "/";
461		575
462	if (exists $kv{domain}) {	576	if (exists $kv{domain}) {
…		…
468		582
469	# this is not rfc-like and not netscape-like. go figure.	583	# this is not rfc-like and not netscape-like. go figure.
470	my $ndots = $cdom =~ y/.//;	584	my $ndots = $cdom =~ y/.//;
471	next if $ndots < ($cdom =~ /\.[^.][^.]\.[^.][^.]$/ ? 3 : 2);	585	next if $ndots < ($cdom =~ /\.[^.][^.]\.[^.][^.]$/ ? 3 : 2);
472	} else {	586	} else {
473	$cdom = $uhost;	587	$cdom = $host;
474	}	588	}
475		589
476	# store it	590	# store it
477	$arg{cookie_jar}{version} = 1;	591	$jar->{version} = 1;
478	$arg{cookie_jar}{$cdom}{$cpath}{$name} = \%kv;	592	$jar->{lc $cdom}{$cpath}{$name} = \%kv;
479		593
480	redo if /\G\s*,/gc;	594	redo if /\G\s*,/gc;
481	}	595	}
482	}	596	}
		597
		598	#############################################################################
		599	# keepalive/persistent connection cache
		600
		601	# fetch a connection from the keepalive cache
		602	sub ka_fetch($) {
		603	my $ka_key = shift;
		604
		605	my $hdl = pop @{ $KA_CACHE{$ka_key} }; # currently we reuse the MOST RECENTLY USED connection
		606	delete $KA_CACHE{$ka_key}
		607	unless @{ $KA_CACHE{$ka_key} };
		608
		609	$hdl
483	}	610	}
		611
		612	sub ka_store($$) {
		613	my ($ka_key, $hdl) = @_;
		614
		615	my $kaa = $KA_CACHE{$ka_key} ||= [];
		616
		617	my $destroy = sub {
		618	my @ka = grep $_ != $hdl, @{ $KA_CACHE{$ka_key} };
		619
		620	$hdl->destroy;
		621
		622	@ka
		623	? $KA_CACHE{$ka_key} = \@ka
		624	: delete $KA_CACHE{$ka_key};
		625	};
		626
		627	# on error etc., destroy
		628	$hdl->on_error ($destroy);
		629	$hdl->on_eof ($destroy);
		630	$hdl->on_read ($destroy);
		631	$hdl->timeout ($PERSISTENT_TIMEOUT);
		632
		633	push @$kaa, $hdl;
		634	shift @$kaa while @$kaa > $MAX_PER_HOST;
		635	}
		636
		637	#############################################################################
		638	# utilities
484		639
485	# continue to parse $_ for headers and place them into the arg	640	# continue to parse $_ for headers and place them into the arg
486	sub parse_hdr() {	641	sub _parse_hdr() {
487	my %hdr;	642	my %hdr;
488		643
489	# things seen, not parsed:	644	# things seen, not parsed:
490	# p3pP="NON CUR OTPi OUR NOR UNI"	645	# p3pP="NON CUR OTPi OUR NOR UNI"
491		646
…		…
505	for values %hdr;	660	for values %hdr;
506		661
507	\%hdr	662	\%hdr
508	}	663	}
509		664
		665	#############################################################################
		666	# http_get
		667
510	our $qr_nlnl = qr{(?<![^\012])\015?\012};	668	our $qr_nlnl = qr{(?<![^\012])\015?\012};
511		669
512	our $TLS_CTX_LOW = { cache => 1, sslv2 => 1 };	670	our $TLS_CTX_LOW = { cache => 1, sslv2 => 1 };
513	our $TLS_CTX_HIGH = { cache => 1, verify => 1, verify_peername => "https" };	671	our $TLS_CTX_HIGH = { cache => 1, verify => 1, verify_peername => "https" };
		672
		673	# maybe it should just become a normal object :/
		674
		675	sub _destroy_state(\%) {
		676	my ($state) = @_;
		677
		678	$state->{handle}->destroy if $state->{handle};
		679	%$state = ();
		680	}
		681
		682	sub _error(\%$$) {
		683	my ($state, $cb, $hdr) = @_;
		684
		685	&_destroy_state ($state);
		686
		687	$cb->(undef, $hdr);
		688	()
		689	}
514		690
515	sub http_request($$@) {	691	sub http_request($$@) {
516	my $cb = pop;	692	my $cb = pop;
517	my ($method, $url, %arg) = @_;	693	my ($method, $url, %arg) = @_;
518		694
…		…
536	my $recurse = exists $arg{recurse} ? delete $arg{recurse} : $MAX_RECURSE;	712	my $recurse = exists $arg{recurse} ? delete $arg{recurse} : $MAX_RECURSE;
537		713
538	return $cb->(undef, { @pseudo, Status => 599, Reason => "Too many redirections" })	714	return $cb->(undef, { @pseudo, Status => 599, Reason => "Too many redirections" })
539	if $recurse < 0;	715	if $recurse < 0;
540		716
541	my $proxy = $arg{proxy} || $PROXY;	717	my $proxy = exists $arg{proxy} ? $arg{proxy} : $PROXY;
542	my $timeout = $arg{timeout} || $TIMEOUT;	718	my $timeout = $arg{timeout} || $TIMEOUT;
543		719
544	my ($uscheme, $uauthority, $upath, $query, $fragment) =	720	my ($uscheme, $uauthority, $upath, $query, undef) = # ignore fragment
545	$url =~ m|(?:([^:/?#]+):)?(?://([^/?#]*))?([^?#]*)(?:(\?[^#]*))?(?:#(.*))?|;	721	$url =~ m|^([^:]+):(?://([^/?#]*))?([^?#]*)(?:(\?[^#]*))?(?:#(.*))?$|;
546		722
547	$uscheme = lc $uscheme;	723	$uscheme = lc $uscheme;
548		724
549	my $uport = $uscheme eq "http" ? 80	725	my $uport = $uscheme eq "http" ? 80
550	: $uscheme eq "https" ? 443	726	: $uscheme eq "https" ? 443
551	: return $cb->(undef, { @pseudo, Status => 599, Reason => "Only http and https URL schemes supported" });	727	: return $cb->(undef, { @pseudo, Status => 599, Reason => "Only http and https URL schemes supported" });
552		728
553	$uauthority =~ /^(?: .*\@ )? ([^\@:]+) (?: : (\d+) )?$/x	729	$uauthority =~ /^(?: .*\@ )? ([^\@:]+) (?: : (\d+) )?$/x
554	or return $cb->(undef, { @pseudo, Status => 599, Reason => "Unparsable URL" });	730	or return $cb->(undef, { @pseudo, Status => 599, Reason => "Unparsable URL" });
555		731
556	my $uhost = $1;	732	my $uhost = lc $1;
557	$uport = $2 if defined $2;	733	$uport = $2 if defined $2;
558		734
559	$hdr{host} = defined $2 ? "$uhost:$2" : "$uhost"	735	$hdr{host} = defined $2 ? "$uhost:$2" : "$uhost"
560	unless exists $hdr{host};	736	unless exists $hdr{host};
561		737
…		…
580	$rscheme = "http" unless defined $rscheme;	756	$rscheme = "http" unless defined $rscheme;
581		757
582	# don't support https requests over https-proxy transport,	758	# don't support https requests over https-proxy transport,
583	# can't be done with tls as spec'ed, unless you double-encrypt.	759	# can't be done with tls as spec'ed, unless you double-encrypt.
584	$rscheme = "http" if $uscheme eq "https" && $rscheme eq "https";	760	$rscheme = "http" if $uscheme eq "https" && $rscheme eq "https";
		761
		762	$rhost = lc $rhost;
		763	$rscheme = lc $rscheme;
585	} else {	764	} else {
586	($rhost, $rport, $rscheme, $rpath) = ($uhost, $uport, $uscheme, $upath);	765	($rhost, $rport, $rscheme, $rpath) = ($uhost, $uport, $uscheme, $upath);
587	}	766	}
588		767
589	# leave out fragment and query string, just a heuristic	768	# leave out fragment and query string, just a heuristic
…		…
591	$hdr{"user-agent"} = $USERAGENT unless exists $hdr{"user-agent"};	770	$hdr{"user-agent"} = $USERAGENT unless exists $hdr{"user-agent"};
592		771
593	$hdr{"content-length"} = length $arg{body}	772	$hdr{"content-length"} = length $arg{body}
594	if length $arg{body} || $method ne "GET";	773	if length $arg{body} || $method ne "GET";
595		774
596	$hdr{connection} = "close TE"; #1.1	775	my $idempotent = $method =~ /^(?:GET|HEAD|PUT|DELETE|OPTIONS|TRACE)$/;
		776
		777	# default value for keepalive is true iff the request is for an idempotent method
		778	my $persistent = exists $arg{persistent} ? !!$arg{persistent} : $idempotent;
		779	my $keepalive = exists $arg{keepalive} ? !!$arg{keepalive} : !$proxy;
		780	my $was_persistent; # true if this is actually a recycled connection
		781
		782	# the key to use in the keepalive cache
		783	my $ka_key = "$uhost\x00$arg{sessionid}";
		784
		785	$hdr{connection} = ($persistent ? $keepalive ? "keep-alive " : "" : "close ") . "Te"; #1.1
597	$hdr{te} = "trailers" unless exists $hdr{te}; #1.1	786	$hdr{te} = "trailers" unless exists $hdr{te}; #1.1
598		787
599	my %state = (connect_guard => 1);	788	my %state = (connect_guard => 1);
		789
		790	my $ae_error = 595; # connecting
		791
		792	# handle actual, non-tunneled, request
		793	my $handle_actual_request = sub {
		794	$ae_error = 596; # request phase
		795
		796	my $hdl = $state{handle};
		797
		798	$hdl->starttls ("connect") if $uscheme eq "https" && !exists $hdl->{tls};
		799
		800	# send request
		801	$hdl->push_write (
		802	"$method $rpath HTTP/1.1\015\012"
		803	. (join "", map "\u$_: $hdr{$_}\015\012", grep defined $hdr{$_}, keys %hdr)
		804	. "\015\012"
		805	. (delete $arg{body})
		806	);
		807
		808	# return if error occured during push_write()
		809	return unless %state;
		810
		811	# reduce memory usage, save a kitten, also re-use it for the response headers.
		812	%hdr = ();
		813
		814	# status line and headers
		815	$state{read_response} = sub {
		816	return unless %state;
		817
		818	for ("$_[1]") {
		819	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
		820
		821	/^HTTP\/0*([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\012]*) )? \012/gxci
		822	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Invalid server response" };
		823
		824	# 100 Continue handling
		825	# should not happen as we don't send expect: 100-continue,
		826	# but we handle it just in case.
		827	# since we send the request body regardless, if we get an error
		828	# we are out of-sync, which we currently do NOT handle correctly.
		829	return $state{handle}->push_read (line => $qr_nlnl, $state{read_response})
		830	if $2 eq 100;
		831
		832	push @pseudo,
		833	HTTPVersion => $1,
		834	Status => $2,
		835	Reason => $3,
		836	;
		837
		838	my $hdr = _parse_hdr
		839	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Garbled response headers" };
		840
		841	%hdr = (%$hdr, @pseudo);
		842	}
		843
		844	# redirect handling
		845	# microsoft and other shitheads don't give a shit for following standards,
		846	# try to support some common forms of broken Location headers.
		847	if ($hdr{location} !~ /^(?: $ | [^:\/?\#]+ : )/x) {
		848	$hdr{location} =~ s/^\.\/+//;
		849
		850	my $url = "$rscheme://$uhost:$uport";
		851
		852	unless ($hdr{location} =~ s/^\///) {
		853	$url .= $upath;
		854	$url =~ s/\/[^\/]*$//;
		855	}
		856
		857	$hdr{location} = "$url/$hdr{location}";
		858	}
		859
		860	my $redirect;
		861
		862	if ($recurse) {
		863	my $status = $hdr{Status};
		864
		865	# industry standard is to redirect POST as GET for
		866	# 301, 302 and 303, in contrast to HTTP/1.0 and 1.1.
		867	# also, the UA should ask the user for 301 and 307 and POST,
		868	# industry standard seems to be to simply follow.
		869	# we go with the industry standard.
		870	if ($status == 301 or $status == 302 or $status == 303) {
		871	# HTTP/1.1 is unclear on how to mutate the method
		872	$method = "GET" unless $method eq "HEAD";
		873	$redirect = 1;
		874	} elsif ($status == 307) {
		875	$redirect = 1;
		876	}
		877	}
		878
		879	my $finish = sub { # ($data, $err_status, $err_reason[, $persistent])
		880	if ($state{handle}) {
		881	# handle keepalive
		882	if (
		883	$persistent
		884	&& $_[3]
		885	&& ($hdr{HTTPVersion} < 1.1
		886	? $hdr{connection} =~ /\bkeep-?alive\b/i
		887	: $hdr{connection} !~ /\bclose\b/i)
		888	) {
		889	ka_store $ka_key, delete $state{handle};
		890	} else {
		891	# no keepalive, destroy the handle
		892	$state{handle}->destroy;
		893	}
		894	}
		895
		896	%state = ();
		897
		898	if (defined $_[1]) {
		899	$hdr{OrigStatus} = $hdr{Status}; $hdr{Status} = $_[1];
		900	$hdr{OrigReason} = $hdr{Reason}; $hdr{Reason} = $_[2];
		901	}
		902
		903	# set-cookie processing
		904	if ($arg{cookie_jar}) {
		905	cookie_jar_set_cookie $arg{cookie_jar}, $hdr{"set-cookie"}, $uhost, $hdr{date};
		906	}
		907
		908	if ($redirect && exists $hdr{location}) {
		909	# we ignore any errors, as it is very common to receive
		910	# Content-Length != 0 but no actual body
		911	# we also access %hdr, as $_[1] might be an erro
		912	$state{recurse} =
		913	http_request (
		914	$method => $hdr{location},
		915	%arg,
		916	recurse => $recurse - 1,
		917	Redirect => [$_[0], \%hdr],
		918	sub {
		919	%state = ();
		920	&$cb
		921	},
		922	);
		923	} else {
		924	$cb->($_[0], \%hdr);
		925	}
		926	};
		927
		928	$ae_error = 597; # body phase
		929
		930	my $chunked = $hdr{"transfer-encoding"} =~ /\bchunked\b/i; # not quite correct...
		931
		932	my $len = $chunked ? undef : $hdr{"content-length"};
		933
		934	# body handling, many different code paths
		935	# - no body expected
		936	# - want_body_handle
		937	# - te chunked
		938	# - 2x length known (with or without on_body)
		939	# - 2x length not known (with or without on_body)
		940	if (!$redirect && $arg{on_header} && !$arg{on_header}(\%hdr)) {
		941	$finish->(undef, 598 => "Request cancelled by on_header");
		942	} elsif (
		943	$hdr{Status} =~ /^(?:1..|204|205|304)$/
		944	or $method eq "HEAD"
		945	or (defined $len && $len == 0) # == 0, not !, because "0 " is true
		946	) {
		947	# no body
		948	$finish->("", undef, undef, 1);
		949
		950	} elsif (!$redirect && $arg{want_body_handle}) {
		951	$_[0]->on_eof (undef);
		952	$_[0]->on_error (undef);
		953	$_[0]->on_read (undef);
		954
		955	$finish->(delete $state{handle});
		956
		957	} elsif ($chunked) {
		958	my $cl = 0;
		959	my $body = "";
		960	my $on_body = $arg{on_body} || sub { $body .= shift; 1 };
		961
		962	$state{read_chunk} = sub {
		963	$_[1] =~ /^([0-9a-fA-F]+)/
		964	or $finish->(undef, $ae_error => "Garbled chunked transfer encoding");
		965
		966	my $len = hex $1;
		967
		968	if ($len) {
		969	$cl += $len;
		970
		971	$_[0]->push_read (chunk => $len, sub {
		972	$on_body->($_[1], \%hdr)
		973	or return $finish->(undef, 598 => "Request cancelled by on_body");
		974
		975	$_[0]->push_read (line => sub {
		976	length $_[1]
		977	and return $finish->(undef, $ae_error => "Garbled chunked transfer encoding");
		978	$_[0]->push_read (line => $state{read_chunk});
		979	});
		980	});
		981	} else {
		982	$hdr{"content-length"} ||= $cl;
		983
		984	$_[0]->push_read (line => $qr_nlnl, sub {
		985	if (length $_[1]) {
		986	for ("$_[1]") {
		987	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
		988
		989	my $hdr = _parse_hdr
		990	or return $finish->(undef, $ae_error => "Garbled response trailers");
		991
		992	%hdr = (%hdr, %$hdr);
		993	}
		994	}
		995
		996	$finish->($body, undef, undef, 1);
		997	});
		998	}
		999	};
		1000
		1001	$_[0]->push_read (line => $state{read_chunk});
		1002
		1003	} elsif ($arg{on_body}) {
		1004	if (defined $len) {
		1005	$_[0]->on_read (sub {
		1006	$len -= length $_[0]{rbuf};
		1007
		1008	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
		1009	or return $finish->(undef, 598 => "Request cancelled by on_body");
		1010
		1011	$len > 0
		1012	or $finish->("", undef, undef, 1);
		1013	});
		1014	} else {
		1015	$_[0]->on_eof (sub {
		1016	$finish->("");
		1017	});
		1018	$_[0]->on_read (sub {
		1019	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
		1020	or $finish->(undef, 598 => "Request cancelled by on_body");
		1021	});
		1022	}
		1023	} else {
		1024	$_[0]->on_eof (undef);
		1025
		1026	if (defined $len) {
		1027	$_[0]->on_read (sub {
		1028	$finish->((substr delete $_[0]{rbuf}, 0, $len, ""), undef, undef, 1)
		1029	if $len <= length $_[0]{rbuf};
		1030	});
		1031	} else {
		1032	$_[0]->on_error (sub {
		1033	($! == Errno::EPIPE || !$!)
		1034	? $finish->(delete $_[0]{rbuf})
		1035	: $finish->(undef, $ae_error => $_[2]);
		1036	});
		1037	$_[0]->on_read (sub { });
		1038	}
		1039	}
		1040	};
		1041
		1042	# if keepalive is enabled, then the server closing the connection
		1043	# before a response can happen legally - we retry on idempotent methods.
		1044	if ($was_persistent && $idempotent) {
		1045	my $old_eof = $hdl->{on_eof};
		1046	$hdl->{on_eof} = sub {
		1047	_destroy_state %state;
		1048
		1049	%state = ();
		1050	$state{recurse} =
		1051	http_request (
		1052	$method => $url,
		1053	%arg,
		1054	keepalive => 0,
		1055	sub {
		1056	%state = ();
		1057	&$cb
		1058	}
		1059	);
		1060	};
		1061	$hdl->on_read (sub {
		1062	return unless %state;
		1063
		1064	# as soon as we receive something, a connection close
		1065	# once more becomes a hard error
		1066	$hdl->{on_eof} = $old_eof;
		1067	$hdl->push_read (line => $qr_nlnl, $state{read_response});
		1068	});
		1069	} else {
		1070	$hdl->push_read (line => $qr_nlnl, $state{read_response});
		1071	}
		1072	};
		1073
		1074	my $prepare_handle = sub {
		1075	my ($hdl) = $state{handle};
		1076
		1077	$hdl->on_error (sub {
		1078	_error %state, $cb, { @pseudo, Status => $ae_error, Reason => $_[2] };
		1079	});
		1080	$hdl->on_eof (sub {
		1081	_error %state, $cb, { @pseudo, Status => $ae_error, Reason => "Unexpected end-of-file" };
		1082	});
		1083	$hdl->timeout_reset;
		1084	$hdl->timeout ($timeout);
		1085	};
		1086
		1087	# connected to proxy (or origin server)
		1088	my $connect_cb = sub {
		1089	my $fh = shift
		1090	or return _error %state, $cb, { @pseudo, Status => $ae_error, Reason => "$!" };
		1091
		1092	return unless delete $state{connect_guard};
		1093
		1094	# get handle
		1095	$state{handle} = new AnyEvent::Handle
		1096	%{ $arg{handle_params} },
		1097	fh => $fh,
		1098	peername => $uhost,
		1099	tls_ctx => $arg{tls_ctx},
		1100	;
		1101
		1102	$prepare_handle->();
		1103
		1104	#$state{handle}->starttls ("connect") if $rscheme eq "https";
		1105
		1106	# now handle proxy-CONNECT method
		1107	if ($proxy && $uscheme eq "https") {
		1108	# oh dear, we have to wrap it into a connect request
		1109
		1110	# maybe re-use $uauthority with patched port?
		1111	$state{handle}->push_write ("CONNECT $uhost:$uport HTTP/1.0\015\012\015\012");
		1112	$state{handle}->push_read (line => $qr_nlnl, sub {
		1113	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix
		1114	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Invalid proxy connect response ($_[1])" };
		1115
		1116	if ($2 == 200) {
		1117	$rpath = $upath;
		1118	$handle_actual_request->();
		1119	} else {
		1120	_error %state, $cb, { @pseudo, Status => $2, Reason => $3 };
		1121	}
		1122	});
		1123	} else {
		1124	$handle_actual_request->();
		1125	}
		1126	};
600		1127
601	_get_slot $uhost, sub {	1128	_get_slot $uhost, sub {
602	$state{slot_guard} = shift;	1129	$state{slot_guard} = shift;
603		1130
604	return unless $state{connect_guard};	1131	return unless $state{connect_guard};
605		1132
606	my $connect_cb = sub {	1133	# try to use an existing keepalive connection, but only if we, ourselves, plan
607	$state{fh} = shift	1134	# on a keepalive request (in theory, this should be a separate config option).
608	or do {	1135	if ($persistent && $KA_CACHE{$ka_key}) {
609	my $err = "$!";	1136	$was_persistent = 1;
610	%state = ();
611	return $cb->(undef, { @pseudo, Status => 599, Reason => $err });
612	};
613		1137
614	pop; # free memory, save a tree	1138	$state{handle} = ka_fetch $ka_key;
615
616	return unless delete $state{connect_guard};
617
618	# get handle
619	$state{handle} = new AnyEvent::Handle
620	fh => $state{fh},
621	peername => $rhost,
622	tls_ctx => $arg{tls_ctx},
623	# these need to be reconfigured on keepalive handles
624	timeout => $timeout,
625	on_error => sub {
626	%state = ();
627	$cb->(undef, { @pseudo, Status => 599, Reason => $_[2] });
628	},
629	on_eof => sub {
630	%state = ();
631	$cb->(undef, { @pseudo, Status => 599, Reason => "Unexpected end-of-file" });
632	},
633	;
634
635	# limit the number of persistent connections
636	# keepalive not yet supported
637	# if ($KA_COUNT{$_[1]} < $MAX_PERSISTENT_PER_HOST) {
638	# ++$KA_COUNT{$_[1]};
639	# $state{handle}{ka_count_guard} = AnyEvent::Util::guard {
640	# --$KA_COUNT{$_[1]}
641	# };
642	# $hdr{connection} = "keep-alive";
643	# }
644
645	$state{handle}->starttls ("connect") if $rscheme eq "https";
646
647	# handle actual, non-tunneled, request
648	my $handle_actual_request = sub {
649	$state{handle}->starttls ("connect") if $uscheme eq "https" && !exists $state{handle}{tls};
650
651	# send request
652	$state{handle}->push_write (	1139	$state{handle}->destroyed
653	"$method $rpath HTTP/1.1\015\012"	1140	and die "got a destructed habndle. pah\n";#d#
654	. (join "", map "\u$_: $hdr{$_}\015\012", grep defined $hdr{$_}, keys %hdr)	1141	$prepare_handle->();
655	. "\015\012"	1142	$state{handle}->destroyed
656	. (delete $arg{body})	1143	and die "got a destructed habndle. pa2\n";#d#
657	);
658
659	# return if error occured during push_write()
660	return unless %state;
661
662	%hdr = (); # reduce memory usage, save a kitten, also make it possible to re-use
663
664	# status line and headers
665	$state{read_response} = sub {
666	for ("$_[1]") {
667	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
668
669	/^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\012]*) )? \012/igxc
670	or return (%state = (), $cb->(undef, { @pseudo, Status => 599, Reason => "Invalid server response" }));
671
672	# 100 Continue handling
673	# should not happen as we don't send expect: 100-continue,
674	# but we handle it just in case.
675	# since we send the request body regardless, if we get an error
676	# we are out of-sync, which we currently do NOT handle correctly.
677	return $state{handle}->push_read (line => $qr_nlnl, $state{read_response})
678	if $2 eq 100;
679
680	push @pseudo,
681	HTTPVersion => $1,
682	Status => $2,
683	Reason => $3,
684	;
685
686	my $hdr = parse_hdr
687	or return (%state = (), $cb->(undef, { @pseudo, Status => 599, Reason => "Garbled response headers" }));
688
689	%hdr = (%$hdr, @pseudo);
690	}
691
692	# redirect handling
693	# microsoft and other shitheads don't give a shit for following standards,
694	# try to support some common forms of broken Location headers.
695	if ($hdr{location} !~ /^(?: $ | [^:\/?\#]+ : )/x) {
696	$hdr{location} =~ s/^\.\/+//;
697
698	my $url = "$rscheme://$uhost:$uport";
699
700	unless ($hdr{location} =~ s/^\///) {
701	$url .= $upath;
702	$url =~ s/\/[^\/]*$//;
703	}
704
705	$hdr{location} = "$url/$hdr{location}";
706	}
707
708	my $redirect;
709
710	if ($recurse) {
711	my $status = $hdr{Status};
712
713	# industry standard is to redirect POST as GET for
714	# 301, 302 and 303, in contrast to http/1.0 and 1.1.
715	# also, the UA should ask the user for 301 and 307 and POST,
716	# industry standard seems to be to simply follow.
717	# we go with the industry standard.
718	if ($status == 301 or $status == 302 or $status == 303) {
719	# HTTP/1.1 is unclear on how to mutate the method
720	$method = "GET" unless $method eq "HEAD";
721	$redirect = 1;
722	} elsif ($status == 307) {
723	$redirect = 1;
724	}
725	}
726
727	my $finish = sub { # ($data, $err_status, $err_reason[, $keepalive])
728	my $keepalive = pop;
729
730	$state{handle}->destroy if $state{handle};
731	%state = ();
732
733	if (defined $_[1]) {
734	$hdr{OrigStatus} = $hdr{Status}; $hdr{Status} = $_[1];
735	$hdr{OrigReason} = $hdr{Reason}; $hdr{Reason} = $_[2];
736	}
737
738	# set-cookie processing
739	if ($arg{cookie_jar}) {
740	cookie_jar_set_cookie $arg{cookie_jar}, $hdr{"set-cookie"};
741
742	if ($redirect && exists $hdr{location}) {
743	# we ignore any errors, as it is very common to receive
744	# Content-Length != 0 but no actual body
745	# we also access %hdr, as $_[1] might be an erro
746	http_request (
747	$method => $hdr{location},
748	%arg,
749	recurse => $recurse - 1,
750	Redirect => [$_[0], \%hdr],
751	$cb);
752	} else {
753	$cb->($_[0], \%hdr);
754	}
755	};
756
757	my $len = $hdr{"content-length"};
758
759	if (!$redirect && $arg{on_header} && !$arg{on_header}(\%hdr)) {
760	$finish->(undef, 598 => "Request cancelled by on_header");
761	} elsif (
762	$hdr{Status} =~ /^(?:1..|204|205|304)$/
763	or $method eq "HEAD"
764	or (defined $len && !$len)
765	) {
766	# no body
767	$finish->("", undef, undef, 1);
768	} else {
769	# body handling, many different code paths
770	# - no body expected
771	# - want_body_handle
772	# - te chunked
773	# - 2x length known (with or without on_body)
774	# - 2x length not known (with or without on_body)
775	if (!$redirect && $arg{want_body_handle}) {
776	$_[0]->on_eof (undef);
777	$_[0]->on_error (undef);
778	$_[0]->on_read (undef);
779
780	$finish->(delete $state{handle});
781
782	} elsif ($hdr{"transfer-encoding"} =~ /\bchunked\b/i) {
783	my $cl = 0;
784	my $body = undef;
785	my $on_body = $arg{on_body} || sub { $body .= shift; 1 };
786
787	$_[0]->on_error (sub { $finish->(undef, 599 => $_[2]) });
788
789	my $read_chunk; $read_chunk = sub {
790	$_[1] =~ /^([0-9a-fA-F]+)/
791	or $finish->(undef, 599 => "Garbled chunked transfer encoding");
792
793	my $len = hex $1;
794
795	if ($len) {
796	$cl += $len;
797
798	$_[0]->push_read (chunk => $len, sub {
799	$on_body->($_[1], \%hdr)
800	or return $finish->(undef, 598 => "Request cancelled by on_body");
801
802	$_[0]->push_read (line => sub {
803	length $_[1]
804	and return $finish->(undef, 599 => "Garbled chunked transfer encoding");
805	$_[0]->push_read (line => $read_chunk);
806	});
807	});
808	} else {
809	$hdr{"content-length"} ||= $cl;
810
811	$_[0]->push_read (line => $qr_nlnl, sub {
812	if (length $_[1]) {
813	for ("$_[1]") {
814	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
815
816	my $hdr = parse_hdr
817	or return $finish->(undef, 599 => "Garbled response trailers");
818
819	%hdr = (%hdr, %$hdr);
820	}
821	}
822
823	$finish->($body, undef, undef, 1);
824	});
825	}
826	};
827
828	$_[0]->push_read (line => $read_chunk);
829
830	} elsif ($arg{on_body}) {
831	$_[0]->on_error (sub { $finish->(undef, 599 => $_[2]) });
832
833	if ($len) {
834	$_[0]->on_read (sub {
835	$len -= length $_[0]{rbuf};
836
837	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
838	or return $finish->(undef, 598 => "Request cancelled by on_body");
839
840	$len > 0
841	or $finish->("", undef, undef, 1);
842	});
843	} else {
844	$_[0]->on_eof (sub {
845	$finish->("");
846	});
847	$_[0]->on_read (sub {
848	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
849	or $finish->(undef, 598 => "Request cancelled by on_body");
850	});
851	}
852	} else {
853	$_[0]->on_eof (undef);
854
855	if ($len) {
856	$_[0]->on_error (sub { $finish->(undef, 599 => $_[2]) });
857	$_[0]->on_read (sub {
858	$finish->((substr delete $_[0]{rbuf}, 0, $len, ""), undef, undef, 1)
859	if $len <= length $_[0]{rbuf};
860	});
861	} else {
862	$_[0]->on_error (sub {
863	($! == Errno::EPIPE || !$!)
864	? $finish->(delete $_[0]{rbuf})
865	: $finish->(undef, 599 => $_[2]);
866	});
867	$_[0]->on_read (sub { });
868	}
869	}
870	}
871	};
872
873	$state{handle}->push_read (line => $qr_nlnl, $state{read_response});
874	};
875
876	# now handle proxy-CONNECT method
877	if ($proxy && $uscheme eq "https") {
878	# oh dear, we have to wrap it into a connect request
879
880	# maybe re-use $uauthority with patched port?
881	$state{handle}->push_write ("CONNECT $uhost:$uport HTTP/1.0\015\012Host: $uhost\015\012\015\012");
882	$state{handle}->push_read (line => $qr_nlnl, sub {
883	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix
884	or return (%state = (), $cb->(undef, { @pseudo, Status => 599, Reason => "Invalid proxy connect response ($_[1])" }));
885
886	if ($2 == 200) {
887	$rpath = $upath;
888	&$handle_actual_request;	1144	$handle_actual_request->();
889	} else {	1145	$state{handle}->destroyed
890	%state = ();	1146	and die "got a destructed habndle. pa3\n";#d#
891	$cb->(undef, { @pseudo, Status => $2, Reason => $3 });	1147
892	}
893	});
894	} else {	1148	} else {
895	&$handle_actual_request;
896	}
897	};
898
899	my $tcp_connect = $arg{tcp_connect}	1149	my $tcp_connect = $arg{tcp_connect}
900	|| do { require AnyEvent::Socket; \&AnyEvent::Socket::tcp_connect };	1150	|| do { require AnyEvent::Socket; \&AnyEvent::Socket::tcp_connect };
901		1151
902	$state{connect_guard} = $tcp_connect->($rhost, $rport, $connect_cb, $arg{on_prepare} || sub { $timeout });	1152	$state{connect_guard} = $tcp_connect->($rhost, $rport, $connect_cb, $arg{on_prepare} || sub { $timeout });
903		1153	}
904	};	1154	};
905		1155
906	defined wantarray && AnyEvent::Util::guard { %state = () }	1156	defined wantarray && AnyEvent::Util::guard { _destroy_state %state }
907	}	1157	}
908		1158
909	sub http_get($@) {	1159	sub http_get($@) {
910	unshift @_, "GET";	1160	unshift @_, "GET";
911	&http_request	1161	&http_request
…		…
929	AnyEvent::HTTP uses the AnyEvent::Socket::tcp_connect function for	1179	AnyEvent::HTTP uses the AnyEvent::Socket::tcp_connect function for
930	the actual connection, which in turn uses AnyEvent::DNS to resolve	1180	the actual connection, which in turn uses AnyEvent::DNS to resolve
931	hostnames. The latter is a simple stub resolver and does no caching	1181	hostnames. The latter is a simple stub resolver and does no caching
932	on its own. If you want DNS caching, you currently have to provide	1182	on its own. If you want DNS caching, you currently have to provide
933	your own default resolver (by storing a suitable resolver object in	1183	your own default resolver (by storing a suitable resolver object in
934	C<$AnyEvent::DNS::RESOLVER>).	1184	C<$AnyEvent::DNS::RESOLVER>) or your own C<tcp_connect> callback.
935		1185
936	=head2 GLOBAL FUNCTIONS AND VARIABLES	1186	=head2 GLOBAL FUNCTIONS AND VARIABLES
937		1187
938	=over 4	1188	=over 4
939		1189
940	=item AnyEvent::HTTP::set_proxy "proxy-url"	1190	=item AnyEvent::HTTP::set_proxy "proxy-url"
941		1191
942	Sets the default proxy server to use. The proxy-url must begin with a	1192	Sets the default proxy server to use. The proxy-url must begin with a
943	string of the form C<http://host:port> (optionally C<https:...>), croaks	1193	string of the form C<http://host:port>, croaks otherwise.
944	otherwise.
945		1194
946	To clear an already-set proxy, use C<undef>.	1195	To clear an already-set proxy, use C<undef>.
		1196
		1197	When AnyEvent::HTTP is laoded for the first time it will query the
		1198	default proxy from the operating system, currently by looking at
		1199	C<$ENV{http_proxy>}.
		1200
		1201	=item AnyEvent::HTTP::cookie_jar_expire $jar[, $session_end]
		1202
		1203	Remove all cookies from the cookie jar that have been expired. If
		1204	C<$session_end> is given and true, then additionally remove all session
		1205	cookies.
		1206
		1207	You should call this function (with a true C<$session_end>) before you
		1208	save cookies to disk, and you should call this function after loading them
		1209	again. If you have a long-running program you can additonally call this
		1210	function from time to time.
		1211
		1212	A cookie jar is initially an empty hash-reference that is managed by this
		1213	module. It's format is subject to change, but currently it is like this:
		1214
		1215	The key C<version> has to contain C<1>, otherwise the hash gets
		1216	emptied. All other keys are hostnames or IP addresses pointing to
		1217	hash-references. The key for these inner hash references is the
		1218	server path for which this cookie is meant, and the values are again
		1219	hash-references. The keys of those hash-references is the cookie name, and
		1220	the value, you guessed it, is another hash-reference, this time with the
		1221	key-value pairs from the cookie, except for C<expires> and C<max-age>,
		1222	which have been replaced by a C<_expires> key that contains the cookie
		1223	expiry timestamp.
		1224
		1225	Here is an example of a cookie jar with a single cookie, so you have a
		1226	chance of understanding the above paragraph:
		1227
		1228	{
		1229	version => 1,
		1230	"10.0.0.1" => {
		1231	"/" => {
		1232	"mythweb_id" => {
		1233	_expires => 1293917923,
		1234	value => "ooRung9dThee3ooyXooM1Ohm",
		1235	},
		1236	},
		1237	},
		1238	}
947		1239
948	=item $date = AnyEvent::HTTP::format_date $timestamp	1240	=item $date = AnyEvent::HTTP::format_date $timestamp
949		1241
950	Takes a POSIX timestamp (seconds since the epoch) and formats it as a HTTP	1242	Takes a POSIX timestamp (seconds since the epoch) and formats it as a HTTP
951	Date (RFC 2616).	1243	Date (RFC 2616).
952		1244
953	=item $timestamp = AnyEvent::HTTP::parse_date $date	1245	=item $timestamp = AnyEvent::HTTP::parse_date $date
954		1246
955	Takes a HTTP Date (RFC 2616) or a Cookie date (netscape cookie spec) and	1247	Takes a HTTP Date (RFC 2616) or a Cookie date (netscape cookie spec) or a
956	returns the corresponding POSIX timestamp, or C<undef> if the date cannot	1248	bunch of minor variations of those, and returns the corresponding POSIX
957	be parsed.	1249	timestamp, or C<undef> if the date cannot be parsed.
958		1250
959	=item $AnyEvent::HTTP::MAX_RECURSE	1251	=item $AnyEvent::HTTP::MAX_RECURSE
960		1252
961	The default value for the C<recurse> request parameter (default: C<10>).	1253	The default value for the C<recurse> request parameter (default: C<10>).
		1254
		1255	=item $AnyEvent::HTTP::TIMEOUT
		1256
		1257	The default timeout for conenction operations (default: C<300>).
962		1258
963	=item $AnyEvent::HTTP::USERAGENT	1259	=item $AnyEvent::HTTP::USERAGENT
964		1260
965	The default value for the C<User-Agent> header (the default is	1261	The default value for the C<User-Agent> header (the default is
966	C<Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>).	1262	C<Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>).
967		1263
968	=item $AnyEvent::HTTP::MAX_PER_HOST	1264	=item $AnyEvent::HTTP::MAX_PER_HOST
969		1265
970	The maximum number of concurrent connections to the same host (identified	1266	The maximum number of concurrent connections to the same host (identified
971	by the hostname). If the limit is exceeded, then the additional requests	1267	by the hostname). If the limit is exceeded, then the additional requests
972	are queued until previous connections are closed.	1268	are queued until previous connections are closed. Both persistent and
		1269	non-persistent connections are counted in this limit.
973		1270
974	The default value for this is C<4>, and it is highly advisable to not	1271	The default value for this is C<4>, and it is highly advisable to not
975	increase it.	1272	increase it much.
		1273
		1274	For comparison: the RFC's recommend 4 non-persistent or 2 persistent
		1275	connections, older browsers used 2, newers (such as firefox 3) typically
		1276	use 6, and Opera uses 8 because like, they have the fastest browser and
		1277	give a shit for everybody else on the planet.
		1278
		1279	=item $AnyEvent::HTTP::PERSISTENT_TIMEOUT
		1280
		1281	The time after which idle persistent conenctions get closed by
		1282	AnyEvent::HTTP (default: C<3>).
976		1283
977	=item $AnyEvent::HTTP::ACTIVE	1284	=item $AnyEvent::HTTP::ACTIVE
978		1285
979	The number of active connections. This is not the number of currently	1286	The number of active connections. This is not the number of currently
980	running requests, but the number of currently open and non-idle TCP	1287	running requests, but the number of currently open and non-idle TCP
981	connections. This number of can be useful for load-leveling.	1288	connections. This number can be useful for load-leveling.
982		1289
983	=back	1290	=back
984		1291
985	=cut	1292	=cut
986		1293
…		…
1001	sub parse_date($) {	1308	sub parse_date($) {
1002	my ($date) = @_;	1309	my ($date) = @_;
1003		1310
1004	my ($d, $m, $y, $H, $M, $S);	1311	my ($d, $m, $y, $H, $M, $S);
1005		1312
1006	if ($date =~ /^[A-Z][a-z][a-z], ([0-9][0-9])[\- ]([A-Z][a-z][a-z])[\- ]([0-9][0-9][0-9][0-9]) ([0-9][0-9]):([0-9][0-9]):([0-9][0-9]) GMT$/) {	1313	if ($date =~ /^[A-Z][a-z][a-z]+, ([0-9][0-9]?)[\- ]([A-Z][a-z][a-z])[\- ]([0-9][0-9][0-9][0-9]) ([0-9][0-9]?):([0-9][0-9]?):([0-9][0-9]?) GMT$/) {
1007	# RFC 822/1123, required by RFC 2616 (with " ")	1314	# RFC 822/1123, required by RFC 2616 (with " ")
1008	# cookie dates (with "-")	1315	# cookie dates (with "-")
1009		1316
1010	($d, $m, $y, $H, $M, $S) = ($1, $2, $3, $4, $5, $6);	1317	($d, $m, $y, $H, $M, $S) = ($1, $2, $3, $4, $5, $6);
1011		1318
1012	} elsif ($date =~ /^[A-Z][a-z]+, ([0-9][0-9])-([A-Z][a-z][a-z])-([0-9][0-9]) ([0-9][0-9]):([0-9][0-9]):([0-9][0-9]) GMT$/) {	1319	} elsif ($date =~ /^[A-Z][a-z][a-z]+, ([0-9][0-9]?)-([A-Z][a-z][a-z])-([0-9][0-9]) ([0-9][0-9]?):([0-9][0-9]?):([0-9][0-9]?) GMT$/) {
1013	# RFC 850	1320	# RFC 850
1014	($d, $m, $y, $H, $M, $S) = ($1, $2, $3 < 69 ? $3 + 2000 : $3 + 1900, $4, $5, $6);	1321	($d, $m, $y, $H, $M, $S) = ($1, $2, $3 < 69 ? $3 + 2000 : $3 + 1900, $4, $5, $6);
1015		1322
1016	} elsif ($date =~ /^[A-Z][a-z][a-z] ([A-Z][a-z][a-z]) ([0-9 ][0-9]) ([0-9][0-9]):([0-9][0-9]):([0-9][0-9]) ([0-9][0-9][0-9][0-9])$/) {	1323	} elsif ($date =~ /^[A-Z][a-z][a-z]+ ([A-Z][a-z][a-z]) ([0-9 ]?[0-9]) ([0-9][0-9]?):([0-9][0-9]?):([0-9][0-9]?) ([0-9][0-9][0-9][0-9])$/) {
1017	# ISO C's asctime	1324	# ISO C's asctime
1018	($d, $m, $y, $H, $M, $S) = ($2, $1, $6, $3, $4, $5);	1325	($d, $m, $y, $H, $M, $S) = ($2, $1, $6, $3, $4, $5);
1019	}	1326	}
1020	# other formats fail in the loop below	1327	# other formats fail in the loop below
1021		1328
…		…
1029	undef	1336	undef
1030	}	1337	}
1031		1338
1032	sub set_proxy($) {	1339	sub set_proxy($) {
1033	if (length $_[0]) {	1340	if (length $_[0]) {
1034	$_[0] =~ m%^(https?):// ([^:/]+) (?: : (\d*) )?%ix	1341	$_[0] =~ m%^(http):// ([^:/]+) (?: : (\d*) )?%ix
1035	or Carp::croak "$_[0]: invalid proxy URL";	1342	or Carp::croak "$_[0]: invalid proxy URL";
1036	$PROXY = [$2, $3 || 3128, $1]	1343	$PROXY = [$2, $3 || 3128, $1]
1037	} else {	1344	} else {
1038	undef $PROXY;	1345	undef $PROXY;
1039	}	1346	}
…		…
1042	# initialise proxy from environment	1349	# initialise proxy from environment
1043	eval {	1350	eval {
1044	set_proxy $ENV{http_proxy};	1351	set_proxy $ENV{http_proxy};
1045	};	1352	};
1046		1353
		1354	=head2 SHOWCASE
		1355
		1356	This section contaisn some more elaborate "real-world" examples or code
		1357	snippets.
		1358
		1359	=head2 HTTP/1.1 FILE DOWNLOAD
		1360
		1361	Downloading files with HTTP can be quite tricky, especially when something
		1362	goes wrong and you want to resume.
		1363
		1364	Here is a function that initiates and resumes a download. It uses the
		1365	last modified time to check for file content changes, and works with many
		1366	HTTP/1.0 servers as well, and usually falls back to a complete re-download
		1367	on older servers.
		1368
		1369	It calls the completion callback with either C<undef>, which means a
		1370	nonretryable error occured, C<0> when the download was partial and should
		1371	be retried, and C<1> if it was successful.
		1372
		1373	use AnyEvent::HTTP;
		1374
		1375	sub download($$$) {
		1376	my ($url, $file, $cb) = @_;
		1377
		1378	open my $fh, "+<", $file
		1379	or die "$file: $!";
		1380
		1381	my %hdr;
		1382	my $ofs = 0;
		1383
		1384	warn stat $fh;
		1385	warn -s _;
		1386	if (stat $fh and -s _) {
		1387	$ofs = -s _;
		1388	warn "-s is ", $ofs;#d#
		1389	$hdr{"if-unmodified-since"} = AnyEvent::HTTP::format_date +(stat _)[9];
		1390	$hdr{"range"} = "bytes=$ofs-";
		1391	}
		1392
		1393	http_get $url,
		1394	headers => \%hdr,
		1395	on_header => sub {
		1396	my ($hdr) = @_;
		1397
		1398	if ($hdr->{Status} == 200 && $ofs) {
		1399	# resume failed
		1400	truncate $fh, $ofs = 0;
		1401	}
		1402
		1403	sysseek $fh, $ofs, 0;
		1404
		1405	1
		1406	},
		1407	on_body => sub {
		1408	my ($data, $hdr) = @_;
		1409
		1410	if ($hdr->{Status} =~ /^2/) {
		1411	length $data == syswrite $fh, $data
		1412	or return; # abort on write errors
		1413	}
		1414
		1415	1
		1416	},
		1417	sub {
		1418	my (undef, $hdr) = @_;
		1419
		1420	my $status = $hdr->{Status};
		1421
		1422	if (my $time = AnyEvent::HTTP::parse_date $hdr->{"last-modified"}) {
		1423	utime $fh, $time, $time;
		1424	}
		1425
		1426	if ($status == 200 || $status == 206 || $status == 416) {
		1427	# download ok || resume ok || file already fully downloaded
		1428	$cb->(1, $hdr);
		1429
		1430	} elsif ($status == 412) {
		1431	# file has changed while resuming, delete and retry
		1432	unlink $file;
		1433	$cb->(0, $hdr);
		1434
		1435	} elsif ($status == 500 or $status == 503 or $status =~ /^59/) {
		1436	# retry later
		1437	$cb->(0, $hdr);
		1438
		1439	} else {
		1440	$cb->(undef, $hdr);
		1441	}
		1442	}
		1443	;
		1444	}
		1445
		1446	download "http://server/somelargefile", "/tmp/somelargefile", sub {
		1447	if ($_[0]) {
		1448	print "OK!\n";
		1449	} elsif (defined $_[0]) {
		1450	print "please retry later\n";
		1451	} else {
		1452	print "ERROR\n";
		1453	}
		1454	};
		1455
1047	=head2 SOCKS PROXIES	1456	=head3 SOCKS PROXIES
1048		1457
1049	Socks proxies are not directly supported by AnyEvent::HTTP. You can	1458	Socks proxies are not directly supported by AnyEvent::HTTP. You can
1050	compile your perl to support socks, or use an external program such as	1459	compile your perl to support socks, or use an external program such as
1051	F<socksify> (dante) or F<tsocks> to make your program use a socks proxy	1460	F<socksify> (dante) or F<tsocks> to make your program use a socks proxy
1052	transparently.	1461	transparently.

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