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

Comparing AnyEvent-HTTP/HTTP.pm (file contents):
Revision 1.82 by root, Sun Jan 2 04:50:40 2011 UTC vs.
Revision 1.109 by root, Wed Jul 27 16:11:55 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 = '2.13';
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
…		…
170	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
171	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:>
172	(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
173	they won't be sent at all).	168	they won't be sent at all).
174		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
		174	Also, make sure that your headers names and values do not contain any
		175	embedded newlines.
		176
175	=item timeout => $seconds	177	=item timeout => $seconds
176		178
177	The time-out to use for various stages - each connect attempt will reset	179	The time-out to use for various stages - each connect attempt will reset
178	the timeout, as will read or write activity, i.e. this is not an overall	180	the timeout, as will read or write activity, i.e. this is not an overall
179	timeout.	181	timeout.
180		182
181	Default timeout is 5 minutes.	183	Default timeout is 5 minutes.
182		184
183	=item proxy => [$host, $port[, $scheme]] or undef	185	=item proxy => [$host, $port[, $scheme]] or undef
184		186
185	Use the given http proxy for all requests. If not specified, then the	187	Use the given http proxy for all requests, or no proxy if C<undef> is
186	default proxy (as specified by C<$ENV{http_proxy}>) is used.	188	used.
187		189
188	C<$scheme> must be either missing, C<http> for HTTP or C<https> for	190	C<$scheme> must be either missing or must be C<http> for HTTP.
189	HTTPS.	191
		192	If not specified, then the default proxy is used (see
		193	C<AnyEvent::HTTP::set_proxy>).
190		194
191	=item body => $string	195	=item body => $string
192		196
193	The request body, usually empty. Will be sent as-is (future versions of	197	The request body, usually empty. Will be sent as-is (future versions of
194	this module might offer more options).	198	this module might offer more options).
…		…
224	verification, highest compatibility) and high-security (CA and common-name	228	verification, highest compatibility) and high-security (CA and common-name
225	verification) TLS context.	229	verification) TLS context.
226		230
227	The default for this option is C<low>, which could be interpreted as "give	231	The default for this option is C<low>, which could be interpreted as "give
228	me the page, no matter what".	232	me the page, no matter what".
		233
		234	See also the C<sessionid> parameter.
		235
		236	=item session => $string
		237
		238	The module might reuse connections to the same host internally. Sometimes
		239	(e.g. when using TLS), you do not want to reuse connections from other
		240	sessions. This can be achieved by setting this parameter to some unique
		241	ID (such as the address of an object storing your state data, or the TLS
		242	context) - only connections using the same unique ID will be reused.
229		243
230	=item on_prepare => $callback->($fh)	244	=item on_prepare => $callback->($fh)
231		245
232	In rare cases you need to "tune" the socket before it is used to	246	In rare cases you need to "tune" the socket before it is used to
233	connect (for exmaple, to bind it on a given IP address). This parameter	247	connect (for exmaple, to bind it on a given IP address). This parameter
…		…
303	called. Instead of the C<$body> argument containing the body data, the	317	called. Instead of the C<$body> argument containing the body data, the
304	callback will receive the L<AnyEvent::Handle> object associated with the	318	callback will receive the L<AnyEvent::Handle> object associated with the
305	connection. In error cases, C<undef> will be passed. When there is no body	319	connection. In error cases, C<undef> will be passed. When there is no body
306	(e.g. status C<304>), the empty string will be passed.	320	(e.g. status C<304>), the empty string will be passed.
307		321
308	The handle object might or might not be in TLS mode, might be connected to	322	The handle object might or might not be in TLS mode, might be connected
309	a proxy, be a persistent connection etc., and configured in unspecified	323	to a proxy, be a persistent connection, use chunked transfer encoding
310	ways. The user is responsible for this handle (it will not be used by this	324	etc., and configured in unspecified ways. The user is responsible for this
311	module anymore).	325	handle (it will not be used by this module anymore).
312		326
313	This is useful with some push-type services, where, after the initial	327	This is useful with some push-type services, where, after the initial
314	headers, an interactive protocol is used (typical example would be the	328	headers, an interactive protocol is used (typical example would be the
315	push-style twitter API which starts a JSON/XML stream).	329	push-style twitter API which starts a JSON/XML stream).
316		330
317	If you think you need this, first have a look at C<on_body>, to see if	331	If you think you need this, first have a look at C<on_body>, to see if
318	that doesn't solve your problem in a better way.	332	that doesn't solve your problem in a better way.
		333
		334	=item persistent => $boolean
		335
		336	Try to create/reuse a persistent connection. When this flag is set
		337	(default: true for idempotent requests, false for all others), then
		338	C<http_request> tries to re-use an existing (previously-created)
		339	persistent connection to the host and, failing that, tries to create a new
		340	one.
		341
		342	Requests failing in certain ways will be automatically retried once, which
		343	is dangerous for non-idempotent requests, which is why it defaults to off
		344	for them. The reason for this is because the bozos who designed HTTP/1.1
		345	made it impossible to distinguish between a fatal error and a normal
		346	connection timeout, so you never know whether there was a problem with
		347	your request or not.
		348
		349	When reusing an existent connection, many parameters (such as TLS context)
		350	will be ignored. See the C<session> parameter for a workaround.
		351
		352	=item keepalive => $boolean
		353
		354	Only used when C<persistent> is also true. This parameter decides whether
		355	C<http_request> tries to handshake a HTTP/1.0-style keep-alive connection
		356	(as opposed to only a HTTP/1.1 persistent connection).
		357
		358	The default is true, except when using a proxy, in which case it defaults
		359	to false, as HTTP/1.0 proxies cannot support this in a meaningful way.
		360
		361	=item handle_params => { key => value ... }
		362
		363	The key-value pairs in this hash will be passed to any L<AnyEvent::Handle>
		364	constructor that is called - not all requests will create a handle, and
		365	sometimes more than one is created, so this parameter is only good for
		366	setting hints.
		367
		368	Example: set the maximum read size to 4096, to potentially conserve memory
		369	at the cost of speed.
		370
		371	handle_params => {
		372	max_read_size => 4096,
		373	},
319		374
320	=back	375	=back
321		376
322	Example: do a simple HTTP GET request for http://www.nethype.de/ and print	377	Example: do a simple HTTP GET request for http://www.nethype.de/ and print
323	the response body.	378	the response body.
…		…
329		384
330	Example: do a HTTP HEAD request on https://www.google.com/, use a	385	Example: do a HTTP HEAD request on https://www.google.com/, use a
331	timeout of 30 seconds.	386	timeout of 30 seconds.
332		387
333	http_request	388	http_request
334	GET => "https://www.google.com",	389	HEAD => "https://www.google.com",
		390	headers => { "user-agent" => "MySearchClient 1.0" },
335	timeout => 30,	391	timeout => 30,
336	sub {	392	sub {
337	my ($body, $hdr) = @_;	393	my ($body, $hdr) = @_;
338	use Data::Dumper;	394	use Data::Dumper;
339	print Dumper $hdr;	395	print Dumper $hdr;
…		…
349	};	405	};
350		406
351	undef $request;	407	undef $request;
352		408
353	=cut	409	=cut
		410
		411	#############################################################################
		412	# wait queue/slots
354		413
355	sub _slot_schedule;	414	sub _slot_schedule;
356	sub _slot_schedule($) {	415	sub _slot_schedule($) {
357	my $host = shift;	416	my $host = shift;
358		417
…		…
381		440
382	_slot_schedule $_[0];	441	_slot_schedule $_[0];
383	}	442	}
384		443
385	#############################################################################	444	#############################################################################
		445	# cookie handling
386		446
387	# expire cookies	447	# expire cookies
388	sub cookie_jar_expire($;$) {	448	sub cookie_jar_expire($;$) {
389	my ($jar, $session_end) = @_;	449	my ($jar, $session_end) = @_;
390		450
…		…
414	}	474	}
415	}	475	}
416		476
417	# extract cookies from jar	477	# extract cookies from jar
418	sub cookie_jar_extract($$$$) {	478	sub cookie_jar_extract($$$$) {
419	my ($jar, $uscheme, $uhost, $upath) = @_;	479	my ($jar, $scheme, $host, $path) = @_;
420		480
421	%$jar = () if $jar->{version} != 1;	481	%$jar = () if $jar->{version} != 1;
422		482
423	my @cookies;	483	my @cookies;
424		484
425	while (my ($chost, $paths) = each %$jar) {	485	while (my ($chost, $paths) = each %$jar) {
426	next unless ref $paths;	486	next unless ref $paths;
427		487
428	if ($chost =~ /^\./) {	488	if ($chost =~ /^\./) {
429	next unless $chost eq substr $uhost, -length $chost;	489	next unless $chost eq substr $host, -length $chost;
430	} elsif ($chost =~ /\./) {	490	} elsif ($chost =~ /\./) {
431	next unless $chost eq $uhost;	491	next unless $chost eq $host;
432	} else {	492	} else {
433	next;	493	next;
434	}	494	}
435		495
436	while (my ($cpath, $cookies) = each %$paths) {	496	while (my ($cpath, $cookies) = each %$paths) {
437	next unless $cpath eq substr $upath, 0, length $cpath;	497	next unless $cpath eq substr $path, 0, length $cpath;
438		498
439	while (my ($cookie, $kv) = each %$cookies) {	499	while (my ($cookie, $kv) = each %$cookies) {
440	next if $uscheme ne "https" && exists $kv->{secure};	500	next if $scheme ne "https" && exists $kv->{secure};
441		501
442	if (exists $kv->{_expires} and AE::now > $kv->{_expires}) {	502	if (exists $kv->{_expires} and AE::now > $kv->{_expires}) {
443	delete $cookies->{$cookie};	503	delete $cookies->{$cookie};
444	next;	504	next;
445	}	505	}
…		…
459	\@cookies	519	\@cookies
460	}	520	}
461		521
462	# parse set_cookie header into jar	522	# parse set_cookie header into jar
463	sub cookie_jar_set_cookie($$$$) {	523	sub cookie_jar_set_cookie($$$$) {
464	my ($jar, $set_cookie, $uhost, $date) = @_;	524	my ($jar, $set_cookie, $host, $date) = @_;
465		525
466	my $anow = int AE::now;	526	my $anow = int AE::now;
467	my $snow; # server-now	527	my $snow; # server-now
468		528
469	for ($set_cookie) {	529	for ($set_cookie) {
…		…
475	while (	535	while (
476	m{	536	m{
477	\G\s*	537	\G\s*
478	(?:	538	(?:
479	expires \s=\s ([A-Z][a-z][a-z]+,\ [^,;]+)	539	expires \s=\s ([A-Z][a-z][a-z]+,\ [^,;]+)
480	\| ([^=;,[:space:]]+) (?: \s=\s (?: "((?:[^\\"]+\|\\.))" \| ([^=;,[:space:]]) ) )?	540	\| ([^=;,[:space:]]+) (?: \s=\s (?: "((?:[^\\"]+\|\\.))" \| ([^;,[:space:]]) ) )?
481	)	541	)
482	}gcxsi	542	}gcxsi
483	) {	543	) {
484	my $name = $2;	544	my $name = $2;
485	my $value = $4;	545	my $value = $4;
…		…
492	# quoted	552	# quoted
493	$value = $3;	553	$value = $3;
494	$value =~ s/\\(.)/$1/gs;	554	$value =~ s/\\(.)/$1/gs;
495	}	555	}
496		556
497	push @kv, lc $name, $value;	557	push @kv, @kv ? lc $name : $name, $value;
498		558
499	last unless /\G\s*;/gc;	559	last unless /\G\s*;/gc;
500	}	560	}
501		561
502	last unless @kv;	562	last unless @kv;
…		…
525		585
526	# this is not rfc-like and not netscape-like. go figure.	586	# this is not rfc-like and not netscape-like. go figure.
527	my $ndots = $cdom =~ y/.//;	587	my $ndots = $cdom =~ y/.//;
528	next if $ndots < ($cdom =~ /\.[^.][^.]\.[^.][^.]$/ ? 3 : 2);	588	next if $ndots < ($cdom =~ /\.[^.][^.]\.[^.][^.]$/ ? 3 : 2);
529	} else {	589	} else {
530	$cdom = $uhost;	590	$cdom = $host;
531	}	591	}
532		592
533	# store it	593	# store it
534	$jar->{version} = 1;	594	$jar->{version} = 1;
535	$jar->{$cdom}{$cpath}{$name} = \%kv;	595	$jar->{lc $cdom}{$cpath}{$name} = \%kv;
536		596
537	redo if /\G\s*,/gc;	597	redo if /\G\s*,/gc;
538	}	598	}
539	}	599	}
540		600
		601	#############################################################################
		602	# keepalive/persistent connection cache
		603
		604	# fetch a connection from the keepalive cache
		605	sub ka_fetch($) {
		606	my $ka_key = shift;
		607
		608	my $hdl = pop @{ $KA_CACHE{$ka_key} }; # currently we reuse the MOST RECENTLY USED connection
		609	delete $KA_CACHE{$ka_key}
		610	unless @{ $KA_CACHE{$ka_key} };
		611
		612	$hdl
		613	}
		614
		615	sub ka_store($$) {
		616	my ($ka_key, $hdl) = @_;
		617
		618	my $kaa = $KA_CACHE{$ka_key} \|\|= [];
		619
		620	my $destroy = sub {
		621	my @ka = grep $_ != $hdl, @{ $KA_CACHE{$ka_key} };
		622
		623	$hdl->destroy;
		624
		625	@ka
		626	? $KA_CACHE{$ka_key} = \@ka
		627	: delete $KA_CACHE{$ka_key};
		628	};
		629
		630	# on error etc., destroy
		631	$hdl->on_error ($destroy);
		632	$hdl->on_eof ($destroy);
		633	$hdl->on_read ($destroy);
		634	$hdl->timeout ($PERSISTENT_TIMEOUT);
		635
		636	push @$kaa, $hdl;
		637	shift @$kaa while @$kaa > $MAX_PER_HOST;
		638	}
		639
		640	#############################################################################
		641	# utilities
		642
541	# continue to parse $_ for headers and place them into the arg	643	# continue to parse $_ for headers and place them into the arg
542	sub parse_hdr() {	644	sub _parse_hdr() {
543	my %hdr;	645	my %hdr;
544		646
545	# things seen, not parsed:	647	# things seen, not parsed:
546	# p3pP="NON CUR OTPi OUR NOR UNI"	648	# p3pP="NON CUR OTPi OUR NOR UNI"
547		649
…		…
561	for values %hdr;	663	for values %hdr;
562		664
563	\%hdr	665	\%hdr
564	}	666	}
565		667
		668	#############################################################################
		669	# http_get
		670
566	our $qr_nlnl = qr{(?<![^\012])\015?\012};	671	our $qr_nlnl = qr{(?<![^\012])\015?\012};
567		672
568	our $TLS_CTX_LOW = { cache => 1, sslv2 => 1 };	673	our $TLS_CTX_LOW = { cache => 1, sslv2 => 1 };
569	our $TLS_CTX_HIGH = { cache => 1, verify => 1, verify_peername => "https" };	674	our $TLS_CTX_HIGH = { cache => 1, verify => 1, verify_peername => "https" };
		675
		676	# maybe it should just become a normal object :/
		677
		678	sub _destroy_state(\%) {
		679	my ($state) = @_;
		680
		681	$state->{handle}->destroy if $state->{handle};
		682	%$state = ();
		683	}
		684
		685	sub _error(\%$$) {
		686	my ($state, $cb, $hdr) = @_;
		687
		688	&_destroy_state ($state);
		689
		690	$cb->(undef, $hdr);
		691	()
		692	}
570		693
571	sub http_request($$@) {	694	sub http_request($$@) {
572	my $cb = pop;	695	my $cb = pop;
573	my ($method, $url, %arg) = @_;	696	my ($method, $url, %arg) = @_;
574		697
…		…
592	my $recurse = exists $arg{recurse} ? delete $arg{recurse} : $MAX_RECURSE;	715	my $recurse = exists $arg{recurse} ? delete $arg{recurse} : $MAX_RECURSE;
593		716
594	return $cb->(undef, { @pseudo, Status => 599, Reason => "Too many redirections" })	717	return $cb->(undef, { @pseudo, Status => 599, Reason => "Too many redirections" })
595	if $recurse < 0;	718	if $recurse < 0;
596		719
597	my $proxy = $arg{proxy} \|\| $PROXY;	720	my $proxy = exists $arg{proxy} ? $arg{proxy} : $PROXY;
598	my $timeout = $arg{timeout} \|\| $TIMEOUT;	721	my $timeout = $arg{timeout} \|\| $TIMEOUT;
599		722
600	my ($uscheme, $uauthority, $upath, $query, $fragment) =	723	my ($uscheme, $uauthority, $upath, $query, undef) = # ignore fragment
601	$url =~ m\|(?:([^:/?#]+):)?(?://([^/?#]))?([^?#])(?:(\?[^#]))?(?:#(.))?\|;	724	$url =~ m\|^([^:]+):(?://([^/?#]))?([^?#])(?:(\?[^#]))?(?:#(.))?$\|;
602		725
603	$uscheme = lc $uscheme;	726	$uscheme = lc $uscheme;
604		727
605	my $uport = $uscheme eq "http" ? 80	728	my $uport = $uscheme eq "http" ? 80
606	: $uscheme eq "https" ? 443	729	: $uscheme eq "https" ? 443
607	: return $cb->(undef, { @pseudo, Status => 599, Reason => "Only http and https URL schemes supported" });	730	: return $cb->(undef, { @pseudo, Status => 599, Reason => "Only http and https URL schemes supported" });
608		731
609	$uauthority =~ /^(?: .*\@ )? ([^\@:]+) (?: : (\d+) )?$/x	732	$uauthority =~ /^(?: .*\@ )? ([^\@:]+) (?: : (\d+) )?$/x
610	or return $cb->(undef, { @pseudo, Status => 599, Reason => "Unparsable URL" });	733	or return $cb->(undef, { @pseudo, Status => 599, Reason => "Unparsable URL" });
611		734
612	my $uhost = $1;	735	my $uhost = lc $1;
613	$uport = $2 if defined $2;	736	$uport = $2 if defined $2;
614		737
615	$hdr{host} = defined $2 ? "$uhost:$2" : "$uhost"	738	$hdr{host} = defined $2 ? "$uhost:$2" : "$uhost"
616	unless exists $hdr{host};	739	unless exists $hdr{host};
617		740
…		…
636	$rscheme = "http" unless defined $rscheme;	759	$rscheme = "http" unless defined $rscheme;
637		760
638	# don't support https requests over https-proxy transport,	761	# don't support https requests over https-proxy transport,
639	# can't be done with tls as spec'ed, unless you double-encrypt.	762	# can't be done with tls as spec'ed, unless you double-encrypt.
640	$rscheme = "http" if $uscheme eq "https" && $rscheme eq "https";	763	$rscheme = "http" if $uscheme eq "https" && $rscheme eq "https";
		764
		765	$rhost = lc $rhost;
		766	$rscheme = lc $rscheme;
641	} else {	767	} else {
642	($rhost, $rport, $rscheme, $rpath) = ($uhost, $uport, $uscheme, $upath);	768	($rhost, $rport, $rscheme, $rpath) = ($uhost, $uport, $uscheme, $upath);
643	}	769	}
644		770
645	# leave out fragment and query string, just a heuristic	771	# leave out fragment and query string, just a heuristic
…		…
647	$hdr{"user-agent"} = $USERAGENT unless exists $hdr{"user-agent"};	773	$hdr{"user-agent"} = $USERAGENT unless exists $hdr{"user-agent"};
648		774
649	$hdr{"content-length"} = length $arg{body}	775	$hdr{"content-length"} = length $arg{body}
650	if length $arg{body} \|\| $method ne "GET";	776	if length $arg{body} \|\| $method ne "GET";
651		777
652	$hdr{connection} = "close TE"; #1.1	778	my $idempotent = $method =~ /^(?:GET\|HEAD\|PUT\|DELETE\|OPTIONS\|TRACE)$/;
		779
		780	# default value for keepalive is true iff the request is for an idempotent method
		781	my $persistent = exists $arg{persistent} ? !!$arg{persistent} : $idempotent;
		782	my $keepalive = exists $arg{keepalive} ? !!$arg{keepalive} : !$proxy;
		783	my $was_persistent; # true if this is actually a recycled connection
		784
		785	# the key to use in the keepalive cache
		786	my $ka_key = "$uscheme\x00$uhost\x00$uport\x00$arg{sessionid}";
		787
		788	$hdr{connection} = ($persistent ? $keepalive ? "keep-alive " : "" : "close ") . "Te"; #1.1
653	$hdr{te} = "trailers" unless exists $hdr{te}; #1.1	789	$hdr{te} = "trailers" unless exists $hdr{te}; #1.1
654		790
655	my %state = (connect_guard => 1);	791	my %state = (connect_guard => 1);
656		792
657	_get_slot $uhost, sub {
658	$state{slot_guard} = shift;
659
660	return unless $state{connect_guard};
661
662	my $ae_error = 595; # connecting	793	my $ae_error = 595; # connecting
663		794
664	# handle actual, non-tunneled, request	795	# handle actual, non-tunneled, request
665	my $handle_actual_request = sub {	796	my $handle_actual_request = sub {
666	$ae_error = 596; # request phase	797	$ae_error = 596; # request phase
667		798
		799	my $hdl = $state{handle};
		800
668	$state{handle}->starttls ("connect") if $uscheme eq "https" && !exists $state{handle}{tls};	801	$hdl->starttls ("connect") if $uscheme eq "https" && !exists $hdl->{tls};
669		802
670	# send request	803	# send request
671	$state{handle}->push_write (	804	$hdl->push_write (
672	"$method $rpath HTTP/1.1\015\012"	805	"$method $rpath HTTP/1.1\015\012"
673	. (join "", map "\u$_: $hdr{$_}\015\012", grep defined $hdr{$_}, keys %hdr)	806	. (join "", map "\u$_: $hdr{$_}\015\012", grep defined $hdr{$_}, keys %hdr)
674	. "\015\012"	807	. "\015\012"
675	. (delete $arg{body})	808	. (delete $arg{body})
676	);	809	);
677		810
678	# return if error occured during push_write()	811	# return if error occured during push_write()
		812	return unless %state;
		813
		814	# reduce memory usage, save a kitten, also re-use it for the response headers.
		815	%hdr = ();
		816
		817	# status line and headers
		818	$state{read_response} = sub {
679	return unless %state;	819	return unless %state;
680		820
681	%hdr = (); # reduce memory usage, save a kitten, also make it possible to re-use
682
683	# status line and headers
684	$state{read_response} = sub {
685	for ("$_[1]") {	821	for ("$_[1]") {
686	y/\015//d; # weed out any \015, as they show up in the weirdest of places.	822	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
687		823
688	/^HTTP\/0([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\012]) )? \012/gxci	824	/^HTTP\/0([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\012]) )? \012/gxci
689	or return (%state = (), $cb->(undef, { @pseudo, Status => 599, Reason => "Invalid server response" }));	825	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Invalid server response" };
690		826
691	# 100 Continue handling	827	# 100 Continue handling
692	# should not happen as we don't send expect: 100-continue,	828	# should not happen as we don't send expect: 100-continue,
693	# but we handle it just in case.	829	# but we handle it just in case.
694	# since we send the request body regardless, if we get an error	830	# since we send the request body regardless, if we get an error
695	# we are out of-sync, which we currently do NOT handle correctly.	831	# we are out of-sync, which we currently do NOT handle correctly.
696	return $state{handle}->push_read (line => $qr_nlnl, $state{read_response})	832	return $state{handle}->push_read (line => $qr_nlnl, $state{read_response})
697	if $2 eq 100;	833	if $2 eq 100;
698		834
699	push @pseudo,	835	push @pseudo,
700	HTTPVersion => $1,	836	HTTPVersion => $1,
701	Status => $2,	837	Status => $2,
702	Reason => $3,	838	Reason => $3,
703	;	839	;
704		840
705	my $hdr = parse_hdr	841	my $hdr = _parse_hdr
706	or return (%state = (), $cb->(undef, { @pseudo, Status => 599, Reason => "Garbled response headers" }));	842	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Garbled response headers" };
707		843
708	%hdr = (%$hdr, @pseudo);	844	%hdr = (%$hdr, @pseudo);
		845	}
		846
		847	# redirect handling
		848	# microsoft and other shitheads don't give a shit for following standards,
		849	# try to support some common forms of broken Location headers.
		850	if ($hdr{location} !~ /^(?: $ \| [^:\/?\#]+ : )/x) {
		851	$hdr{location} =~ s/^\.\/+//;
		852
		853	my $url = "$rscheme://$uhost:$uport";
		854
		855	unless ($hdr{location} =~ s/^\///) {
		856	$url .= $upath;
		857	$url =~ s/\/[^\/]*$//;
709	}	858	}
710		859
711	# redirect handling
712	# microsoft and other shitheads don't give a shit for following standards,
713	# try to support some common forms of broken Location headers.
714	if ($hdr{location} !~ /^(?: $ \| [^:\/?\#]+ : )/x) {
715	$hdr{location} =~ s/^\.\/+//;
716
717	my $url = "$rscheme://$uhost:$uport";
718
719	unless ($hdr{location} =~ s/^\///) {
720	$url .= $upath;
721	$url =~ s/\/[^\/]*$//;
722	}
723
724	$hdr{location} = "$url/$hdr{location}";	860	$hdr{location} = "$url/$hdr{location}";
		861	}
		862
		863	my $redirect;
		864
		865	if ($recurse) {
		866	my $status = $hdr{Status};
		867
		868	# industry standard is to redirect POST as GET for
		869	# 301, 302 and 303, in contrast to HTTP/1.0 and 1.1.
		870	# also, the UA should ask the user for 301 and 307 and POST,
		871	# industry standard seems to be to simply follow.
		872	# we go with the industry standard.
		873	if ($status == 301 or $status == 302 or $status == 303) {
		874	# HTTP/1.1 is unclear on how to mutate the method
		875	$method = "GET" unless $method eq "HEAD";
		876	$redirect = 1;
		877	} elsif ($status == 307) {
		878	$redirect = 1;
725	}	879	}
		880	}
726		881
727	my $redirect;	882	my $finish = sub { # ($data, $err_status, $err_reason[, $persistent])
728		883	if ($state{handle}) {
729	if ($recurse) {	884	# handle keepalive
730	my $status = $hdr{Status};	885	if (
731		886	$persistent
732	# industry standard is to redirect POST as GET for	887	&& $_[3]
733	# 301, 302 and 303, in contrast to HTTP/1.0 and 1.1.	888	&& ($hdr{HTTPVersion} < 1.1
734	# also, the UA should ask the user for 301 and 307 and POST,	889	? $hdr{connection} =~ /\bkeep-?alive\b/i
735	# industry standard seems to be to simply follow.	890	: $hdr{connection} !~ /\bclose\b/i)
736	# we go with the industry standard.	891	) {
737	if ($status == 301 or $status == 302 or $status == 303) {	892	ka_store $ka_key, delete $state{handle};
738	# HTTP/1.1 is unclear on how to mutate the method	893	} else {
739	$method = "GET" unless $method eq "HEAD";	894	# no keepalive, destroy the handle
740	$redirect = 1;	895	$state{handle}->destroy;
741	} elsif ($status == 307) {
742	$redirect = 1;
743	}	896	}
744	}	897	}
745		898
746	my $finish = sub { # ($data, $err_status, $err_reason[, $keepalive])
747	my $may_keep_alive = $_[3];
748
749	$state{handle}->destroy if $state{handle};
750	%state = ();	899	%state = ();
751		900
752	if (defined $_[1]) {	901	if (defined $_[1]) {
753	$hdr{OrigStatus} = $hdr{Status}; $hdr{Status} = $_[1];	902	$hdr{OrigStatus} = $hdr{Status}; $hdr{Status} = $_[1];
754	$hdr{OrigReason} = $hdr{Reason}; $hdr{Reason} = $_[2];	903	$hdr{OrigReason} = $hdr{Reason}; $hdr{Reason} = $_[2];
755	}	904	}
756		905
757	# set-cookie processing	906	# set-cookie processing
758	if ($arg{cookie_jar}) {	907	if ($arg{cookie_jar}) {
759	cookie_jar_set_cookie $arg{cookie_jar}, $hdr{"set-cookie"}, $uhost, $hdr{date};	908	cookie_jar_set_cookie $arg{cookie_jar}, $hdr{"set-cookie"}, $uhost, $hdr{date};
760	}	909	}
761		910
762	if ($redirect && exists $hdr{location}) {	911	if ($redirect && exists $hdr{location}) {
763	# we ignore any errors, as it is very common to receive	912	# we ignore any errors, as it is very common to receive
764	# Content-Length != 0 but no actual body	913	# Content-Length != 0 but no actual body
765	# we also access %hdr, as $_[1] might be an erro	914	# we also access %hdr, as $_[1] might be an erro
		915	$state{recurse} =
766	http_request (	916	http_request (
767	$method => $hdr{location},	917	$method => $hdr{location},
768	%arg,	918	%arg,
769	recurse => $recurse - 1,	919	recurse => $recurse - 1,
770	Redirect => [$_[0], \%hdr],	920	Redirect => [$_[0], \%hdr],
		921	sub {
		922	%state = ();
		923	&$cb
		924	},
		925	);
		926	} else {
		927	$cb->($_[0], \%hdr);
		928	}
		929	};
		930
		931	$ae_error = 597; # body phase
		932
		933	my $chunked = $hdr{"transfer-encoding"} =~ /\bchunked\b/i; # not quite correct...
		934
		935	my $len = $chunked ? undef : $hdr{"content-length"};
		936
		937	# body handling, many different code paths
		938	# - no body expected
		939	# - want_body_handle
		940	# - te chunked
		941	# - 2x length known (with or without on_body)
		942	# - 2x length not known (with or without on_body)
		943	if (!$redirect && $arg{on_header} && !$arg{on_header}(\%hdr)) {
		944	$finish->(undef, 598 => "Request cancelled by on_header");
		945	} elsif (
		946	$hdr{Status} =~ /^(?:1..\|204\|205\|304)$/
		947	or $method eq "HEAD"
		948	or (defined $len && $len == 0) # == 0, not !, because "0 " is true
		949	) {
		950	# no body
		951	$finish->("", undef, undef, 1);
		952
		953	} elsif (!$redirect && $arg{want_body_handle}) {
		954	$_[0]->on_eof (undef);
		955	$_[0]->on_error (undef);
		956	$_[0]->on_read (undef);
		957
		958	$finish->(delete $state{handle});
		959
		960	} elsif ($chunked) {
		961	my $cl = 0;
		962	my $body = "";
		963	my $on_body = $arg{on_body} \|\| sub { $body .= shift; 1 };
		964
		965	$state{read_chunk} = sub {
		966	$_[1] =~ /^([0-9a-fA-F]+)/
		967	or return $finish->(undef, $ae_error => "Garbled chunked transfer encoding");
		968
		969	my $len = hex $1;
		970
		971	if ($len) {
		972	$cl += $len;
		973
		974	$_[0]->push_read (chunk => $len, sub {
		975	$on_body->($_[1], \%hdr)
		976	or return $finish->(undef, 598 => "Request cancelled by on_body");
		977
		978	$_[0]->push_read (line => sub {
		979	length $_[1]
		980	and return $finish->(undef, $ae_error => "Garbled chunked transfer encoding");
		981	$_[0]->push_read (line => $state{read_chunk});
771	$cb);	982	});
		983	});
772	} else {	984	} else {
773	$cb->($_[0], \%hdr);	985	$hdr{"content-length"} \|\|= $cl;
		986
		987	$_[0]->push_read (line => $qr_nlnl, sub {
		988	if (length $_[1]) {
		989	for ("$_[1]") {
		990	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
		991
		992	my $hdr = _parse_hdr
		993	or return $finish->(undef, $ae_error => "Garbled response trailers");
		994
		995	%hdr = (%hdr, %$hdr);
		996	}
		997	}
		998
		999	$finish->($body, undef, undef, 1);
		1000	});
774	}	1001	}
775	};	1002	};
776		1003
777	$ae_error = 597; # body phase	1004	$_[0]->push_read (line => $state{read_chunk});
778		1005
779	my $len = $hdr{"content-length"};	1006	} elsif ($arg{on_body}) {
		1007	if (defined $len) {
		1008	$_[0]->on_read (sub {
		1009	$len -= length $_[0]{rbuf};
780		1010
781	if (!$redirect && $arg{on_header} && !$arg{on_header}(\%hdr)) {	1011	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
782	$finish->(undef, 598 => "Request cancelled by on_header");	1012	or return $finish->(undef, 598 => "Request cancelled by on_body");
783	} elsif (	1013
784	$hdr{Status} =~ /^(?:1..\|204\|205\|304)$/	1014	$len > 0
785	or $method eq "HEAD"
786	or (defined $len && !$len)
787	) {
788	# no body
789	$finish->("", undef, undef, 1);	1015	or $finish->("", undef, undef, 1);
		1016	});
790	} else {	1017	} else {
791	# body handling, many different code paths
792	# - no body expected
793	# - want_body_handle
794	# - te chunked
795	# - 2x length known (with or without on_body)
796	# - 2x length not known (with or without on_body)
797	if (!$redirect && $arg{want_body_handle}) {
798	$_[0]->on_eof (undef);	1018	$_[0]->on_eof (sub {
799	$_[0]->on_error (undef);	1019	$finish->("");
800	$_[0]->on_read (undef);
801
802	$finish->(delete $state{handle});
803
804	} elsif ($hdr{"transfer-encoding"} =~ /\bchunked\b/i) {
805	my $cl = 0;
806	my $body = undef;
807	my $on_body = $arg{on_body} \|\| sub { $body .= shift; 1 };
808
809	$state{read_chunk} = sub {
810	$_[1] =~ /^([0-9a-fA-F]+)/
811	or $finish->(undef, $ae_error => "Garbled chunked transfer encoding");
812
813	my $len = hex $1;
814
815	if ($len) {
816	$cl += $len;
817
818	$_[0]->push_read (chunk => $len, sub {
819	$on_body->($_[1], \%hdr)
820	or return $finish->(undef, 598 => "Request cancelled by on_body");
821
822	$_[0]->push_read (line => sub {
823	length $_[1]
824	and return $finish->(undef, $ae_error => "Garbled chunked transfer encoding");
825	$_[0]->push_read (line => $state{read_chunk});
826	});
827	});
828	} else {
829	$hdr{"content-length"} \|\|= $cl;
830
831	$_[0]->push_read (line => $qr_nlnl, sub {
832	if (length $_[1]) {
833	for ("$_[1]") {
834	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
835
836	my $hdr = parse_hdr
837	or return $finish->(undef, $ae_error => "Garbled response trailers");
838
839	%hdr = (%hdr, %$hdr);
840	}
841	}
842
843	$finish->($body, undef, undef, 1);
844	});
845	}
846	};	1020	});
847
848	$_[0]->push_read (line => $state{read_chunk});
849
850	} elsif ($arg{on_body}) {
851	if ($len) {
852	$_[0]->on_read (sub {	1021	$_[0]->on_read (sub {
853	$len -= length $_[0]{rbuf};
854
855	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)	1022	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
856	or return $finish->(undef, 598 => "Request cancelled by on_body");
857
858	$len > 0
859	or $finish->("", undef, undef, 1);
860	});
861	} else {
862	$_[0]->on_eof (sub {
863	$finish->("");
864	});
865	$_[0]->on_read (sub {
866	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
867	or $finish->(undef, 598 => "Request cancelled by on_body");	1023	or $finish->(undef, 598 => "Request cancelled by on_body");
868	});
869	}
870	} else {
871	$_[0]->on_eof (undef);
872
873	if ($len) {
874	$_[0]->on_read (sub {
875	$finish->((substr delete $_[0]{rbuf}, 0, $len, ""), undef, undef, 1)
876	if $len <= length $_[0]{rbuf};
877	});
878	} else {
879	$_[0]->on_error (sub {
880	($! == Errno::EPIPE \|\| !$!)
881	? $finish->(delete $_[0]{rbuf})
882	: $finish->(undef, $ae_error => $_[2]);
883	});
884	$_[0]->on_read (sub { });
885	}
886	}	1024	});
887	}	1025	}
888	};
889
890	$state{handle}->push_read (line => $qr_nlnl, $state{read_response});
891	};
892
893	my $connect_cb = sub {
894	$state{fh} = shift
895	or do {
896	my $err = "$!";
897	%state = ();
898	return $cb->(undef, { @pseudo, Status => $ae_error, Reason => $err });
899	};
900
901	return unless delete $state{connect_guard};
902
903	# get handle
904	$state{handle} = new AnyEvent::Handle
905	fh => $state{fh},
906	peername => $rhost,
907	tls_ctx => $arg{tls_ctx},
908	# these need to be reconfigured on keepalive handles
909	timeout => $timeout,
910	on_error => sub {
911	%state = ();
912	$cb->(undef, { @pseudo, Status => $ae_error, Reason => $_[2] });
913	},
914	on_eof => sub {
915	%state = ();
916	$cb->(undef, { @pseudo, Status => $ae_error, Reason => "Unexpected end-of-file" });
917	},
918	;
919
920	# limit the number of persistent connections
921	# keepalive not yet supported
922	# if ($KA_COUNT{$_[1]} < $MAX_PERSISTENT_PER_HOST) {
923	# ++$KA_COUNT{$_[1]};
924	# $state{handle}{ka_count_guard} = AnyEvent::Util::guard {
925	# --$KA_COUNT{$_[1]}
926	# };
927	# $hdr{connection} = "keep-alive";
928	# }
929
930	$state{handle}->starttls ("connect") if $rscheme eq "https";
931
932	# now handle proxy-CONNECT method
933	if ($proxy && $uscheme eq "https") {
934	# oh dear, we have to wrap it into a connect request
935
936	# maybe re-use $uauthority with patched port?
937	$state{handle}->push_write ("CONNECT $uhost:$uport HTTP/1.0\015\012Host: $uhost\015\012\015\012");
938	$state{handle}->push_read (line => $qr_nlnl, sub {
939	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix
940	or return (%state = (), $cb->(undef, { @pseudo, Status => 599, Reason => "Invalid proxy connect response ($_[1])" }));
941
942	if ($2 == 200) {
943	$rpath = $upath;
944	$handle_actual_request->();
945	} else {
946	%state = ();
947	$cb->(undef, { @pseudo, Status => $2, Reason => $3 });
948	}
949	});
950	} else {	1026	} else {
951	$handle_actual_request->();	1027	$_[0]->on_eof (undef);
		1028
		1029	if (defined $len) {
		1030	$_[0]->on_read (sub {
		1031	$finish->((substr delete $_[0]{rbuf}, 0, $len, ""), undef, undef, 1)
		1032	if $len <= length $_[0]{rbuf};
		1033	});
		1034	} else {
		1035	$_[0]->on_error (sub {
		1036	($! == Errno::EPIPE \|\| !$!)
		1037	? $finish->(delete $_[0]{rbuf})
		1038	: $finish->(undef, $ae_error => $_[2]);
		1039	});
		1040	$_[0]->on_read (sub { });
		1041	}
952	}	1042	}
953	};	1043	};
954		1044
955	my $tcp_connect = $arg{tcp_connect}	1045	# if keepalive is enabled, then the server closing the connection
956	\|\| do { require AnyEvent::Socket; \&AnyEvent::Socket::tcp_connect };	1046	# before a response can happen legally - we retry on idempotent methods.
		1047	if ($was_persistent && $idempotent) {
		1048	my $old_eof = $hdl->{on_eof};
		1049	$hdl->{on_eof} = sub {
		1050	_destroy_state %state;
957		1051
958	$state{connect_guard} = $tcp_connect->($rhost, $rport, $connect_cb, $arg{on_prepare} \|\| sub { $timeout });	1052	%state = ();
		1053	$state{recurse} =
		1054	http_request (
		1055	$method => $url,
		1056	%arg,
		1057	keepalive => 0,
		1058	sub {
		1059	%state = ();
		1060	&$cb
		1061	}
		1062	);
		1063	};
		1064	$hdl->on_read (sub {
		1065	return unless %state;
		1066
		1067	# as soon as we receive something, a connection close
		1068	# once more becomes a hard error
		1069	$hdl->{on_eof} = $old_eof;
		1070	$hdl->push_read (line => $qr_nlnl, $state{read_response});
		1071	});
		1072	} else {
		1073	$hdl->push_read (line => $qr_nlnl, $state{read_response});
		1074	}
959	};	1075	};
960		1076
		1077	my $prepare_handle = sub {
		1078	my ($hdl) = $state{handle};
		1079
		1080	$hdl->on_error (sub {
		1081	_error %state, $cb, { @pseudo, Status => $ae_error, Reason => $_[2] };
		1082	});
		1083	$hdl->on_eof (sub {
		1084	_error %state, $cb, { @pseudo, Status => $ae_error, Reason => "Unexpected end-of-file" };
		1085	});
		1086	$hdl->timeout_reset;
		1087	$hdl->timeout ($timeout);
		1088	};
		1089
		1090	# connected to proxy (or origin server)
		1091	my $connect_cb = sub {
		1092	my $fh = shift
		1093	or return _error %state, $cb, { @pseudo, Status => $ae_error, Reason => "$!" };
		1094
		1095	return unless delete $state{connect_guard};
		1096
		1097	# get handle
		1098	$state{handle} = new AnyEvent::Handle
		1099	%{ $arg{handle_params} },
		1100	fh => $fh,
		1101	peername => $uhost,
		1102	tls_ctx => $arg{tls_ctx},
		1103	;
		1104
		1105	$prepare_handle->();
		1106
		1107	#$state{handle}->starttls ("connect") if $rscheme eq "https";
		1108
		1109	# now handle proxy-CONNECT method
		1110	if ($proxy && $uscheme eq "https") {
		1111	# oh dear, we have to wrap it into a connect request
		1112
		1113	# maybe re-use $uauthority with patched port?
		1114	$state{handle}->push_write ("CONNECT $uhost:$uport HTTP/1.0\015\012\015\012");
		1115	$state{handle}->push_read (line => $qr_nlnl, sub {
		1116	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix
		1117	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Invalid proxy connect response ($_[1])" };
		1118
		1119	if ($2 == 200) {
		1120	$rpath = $upath;
		1121	$handle_actual_request->();
		1122	} else {
		1123	_error %state, $cb, { @pseudo, Status => $2, Reason => $3 };
		1124	}
		1125	});
		1126	} else {
		1127	$handle_actual_request->();
		1128	}
		1129	};
		1130
		1131	_get_slot $uhost, sub {
		1132	$state{slot_guard} = shift;
		1133
		1134	return unless $state{connect_guard};
		1135
		1136	# try to use an existing keepalive connection, but only if we, ourselves, plan
		1137	# on a keepalive request (in theory, this should be a separate config option).
		1138	if ($persistent && $KA_CACHE{$ka_key}) {
		1139	$was_persistent = 1;
		1140
		1141	$state{handle} = ka_fetch $ka_key;
		1142	$state{handle}->destroyed
		1143	and die "AnyEvent::HTTP: unexpectedly got a destructed handle (1), please report.";#d#
		1144	$prepare_handle->();
		1145	$state{handle}->destroyed
		1146	and die "AnyEvent::HTTP: unexpectedly got a destructed handle (2), please report.";#d#
		1147	$handle_actual_request->();
		1148
		1149	} else {
		1150	my $tcp_connect = $arg{tcp_connect}
		1151	\|\| do { require AnyEvent::Socket; \&AnyEvent::Socket::tcp_connect };
		1152
		1153	$state{connect_guard} = $tcp_connect->($rhost, $rport, $connect_cb, $arg{on_prepare} \|\| sub { $timeout });
		1154	}
		1155	};
		1156
961	defined wantarray && AnyEvent::Util::guard { %state = () }	1157	defined wantarray && AnyEvent::Util::guard { _destroy_state %state }
962	}	1158	}
963		1159
964	sub http_get($@) {	1160	sub http_get($@) {
965	unshift @_, "GET";	1161	unshift @_, "GET";
966	&http_request	1162	&http_request
…		…
984	AnyEvent::HTTP uses the AnyEvent::Socket::tcp_connect function for	1180	AnyEvent::HTTP uses the AnyEvent::Socket::tcp_connect function for
985	the actual connection, which in turn uses AnyEvent::DNS to resolve	1181	the actual connection, which in turn uses AnyEvent::DNS to resolve
986	hostnames. The latter is a simple stub resolver and does no caching	1182	hostnames. The latter is a simple stub resolver and does no caching
987	on its own. If you want DNS caching, you currently have to provide	1183	on its own. If you want DNS caching, you currently have to provide
988	your own default resolver (by storing a suitable resolver object in	1184	your own default resolver (by storing a suitable resolver object in
989	C<$AnyEvent::DNS::RESOLVER>).	1185	C<$AnyEvent::DNS::RESOLVER>) or your own C<tcp_connect> callback.
990		1186
991	=head2 GLOBAL FUNCTIONS AND VARIABLES	1187	=head2 GLOBAL FUNCTIONS AND VARIABLES
992		1188
993	=over 4	1189	=over 4
994		1190
995	=item AnyEvent::HTTP::set_proxy "proxy-url"	1191	=item AnyEvent::HTTP::set_proxy "proxy-url"
996		1192
997	Sets the default proxy server to use. The proxy-url must begin with a	1193	Sets the default proxy server to use. The proxy-url must begin with a
998	string of the form C<http://host:port> (optionally C<https:...>), croaks	1194	string of the form C<http://host:port>, croaks otherwise.
999	otherwise.
1000		1195
1001	To clear an already-set proxy, use C<undef>.	1196	To clear an already-set proxy, use C<undef>.
		1197
		1198	When AnyEvent::HTTP is laoded for the first time it will query the
		1199	default proxy from the operating system, currently by looking at
		1200	C<$ENV{http_proxy>}.
1002		1201
1003	=item AnyEvent::HTTP::cookie_jar_expire $jar[, $session_end]	1202	=item AnyEvent::HTTP::cookie_jar_expire $jar[, $session_end]
1004		1203
1005	Remove all cookies from the cookie jar that have been expired. If	1204	Remove all cookies from the cookie jar that have been expired. If
1006	C<$session_end> is given and true, then additionally remove all session	1205	C<$session_end> is given and true, then additionally remove all session
…		…
1052		1251
1053	=item $AnyEvent::HTTP::MAX_RECURSE	1252	=item $AnyEvent::HTTP::MAX_RECURSE
1054		1253
1055	The default value for the C<recurse> request parameter (default: C<10>).	1254	The default value for the C<recurse> request parameter (default: C<10>).
1056		1255
		1256	=item $AnyEvent::HTTP::TIMEOUT
		1257
		1258	The default timeout for conenction operations (default: C<300>).
		1259
1057	=item $AnyEvent::HTTP::USERAGENT	1260	=item $AnyEvent::HTTP::USERAGENT
1058		1261
1059	The default value for the C<User-Agent> header (the default is	1262	The default value for the C<User-Agent> header (the default is
1060	C<Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>).	1263	C<Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>).
1061		1264
1062	=item $AnyEvent::HTTP::MAX_PER_HOST	1265	=item $AnyEvent::HTTP::MAX_PER_HOST
1063		1266
1064	The maximum number of concurrent connections to the same host (identified	1267	The maximum number of concurrent connections to the same host (identified
1065	by the hostname). If the limit is exceeded, then the additional requests	1268	by the hostname). If the limit is exceeded, then the additional requests
1066	are queued until previous connections are closed.	1269	are queued until previous connections are closed. Both persistent and
		1270	non-persistent connections are counted in this limit.
1067		1271
1068	The default value for this is C<4>, and it is highly advisable to not	1272	The default value for this is C<4>, and it is highly advisable to not
1069	increase it.	1273	increase it much.
		1274
		1275	For comparison: the RFC's recommend 4 non-persistent or 2 persistent
		1276	connections, older browsers used 2, newers (such as firefox 3) typically
		1277	use 6, and Opera uses 8 because like, they have the fastest browser and
		1278	give a shit for everybody else on the planet.
		1279
		1280	=item $AnyEvent::HTTP::PERSISTENT_TIMEOUT
		1281
		1282	The time after which idle persistent conenctions get closed by
		1283	AnyEvent::HTTP (default: C<3>).
1070		1284
1071	=item $AnyEvent::HTTP::ACTIVE	1285	=item $AnyEvent::HTTP::ACTIVE
1072		1286
1073	The number of active connections. This is not the number of currently	1287	The number of active connections. This is not the number of currently
1074	running requests, but the number of currently open and non-idle TCP	1288	running requests, but the number of currently open and non-idle TCP
1075	connections. This number of can be useful for load-leveling.	1289	connections. This number can be useful for load-leveling.
1076		1290
1077	=back	1291	=back
1078		1292
1079	=cut	1293	=cut
1080		1294
…		…
1123	undef	1337	undef
1124	}	1338	}
1125		1339
1126	sub set_proxy($) {	1340	sub set_proxy($) {
1127	if (length $_[0]) {	1341	if (length $_[0]) {
1128	$_[0] =~ m%^(https?):// ([^:/]+) (?: : (\d*) )?%ix	1342	$_[0] =~ m%^(http):// ([^:/]+) (?: : (\d*) )?%ix
1129	or Carp::croak "$_[0]: invalid proxy URL";	1343	or Carp::croak "$_[0]: invalid proxy URL";
1130	$PROXY = [$2, $3 \|\| 3128, $1]	1344	$PROXY = [$2, $3 \|\| 3128, $1]
1131	} else {	1345	} else {
1132	undef $PROXY;	1346	undef $PROXY;
1133	}	1347	}
…		…
1136	# initialise proxy from environment	1350	# initialise proxy from environment
1137	eval {	1351	eval {
1138	set_proxy $ENV{http_proxy};	1352	set_proxy $ENV{http_proxy};
1139	};	1353	};
1140		1354
		1355	=head2 SHOWCASE
		1356
		1357	This section contaisn some more elaborate "real-world" examples or code
		1358	snippets.
		1359
		1360	=head2 HTTP/1.1 FILE DOWNLOAD
		1361
		1362	Downloading files with HTTP can be quite tricky, especially when something
		1363	goes wrong and you want to resume.
		1364
		1365	Here is a function that initiates and resumes a download. It uses the
		1366	last modified time to check for file content changes, and works with many
		1367	HTTP/1.0 servers as well, and usually falls back to a complete re-download
		1368	on older servers.
		1369
		1370	It calls the completion callback with either C<undef>, which means a
		1371	nonretryable error occured, C<0> when the download was partial and should
		1372	be retried, and C<1> if it was successful.
		1373
		1374	use AnyEvent::HTTP;
		1375
		1376	sub download($$$) {
		1377	my ($url, $file, $cb) = @_;
		1378
		1379	open my $fh, "+<", $file
		1380	or die "$file: $!";
		1381
		1382	my %hdr;
		1383	my $ofs = 0;
		1384
		1385	warn stat $fh;
		1386	warn -s _;
		1387	if (stat $fh and -s _) {
		1388	$ofs = -s _;
		1389	warn "-s is ", $ofs;
		1390	$hdr{"if-unmodified-since"} = AnyEvent::HTTP::format_date +(stat _)[9];
		1391	$hdr{"range"} = "bytes=$ofs-";
		1392	}
		1393
		1394	http_get $url,
		1395	headers => \%hdr,
		1396	on_header => sub {
		1397	my ($hdr) = @_;
		1398
		1399	if ($hdr->{Status} == 200 && $ofs) {
		1400	# resume failed
		1401	truncate $fh, $ofs = 0;
		1402	}
		1403
		1404	sysseek $fh, $ofs, 0;
		1405
		1406	1
		1407	},
		1408	on_body => sub {
		1409	my ($data, $hdr) = @_;
		1410
		1411	if ($hdr->{Status} =~ /^2/) {
		1412	length $data == syswrite $fh, $data
		1413	or return; # abort on write errors
		1414	}
		1415
		1416	1
		1417	},
		1418	sub {
		1419	my (undef, $hdr) = @_;
		1420
		1421	my $status = $hdr->{Status};
		1422
		1423	if (my $time = AnyEvent::HTTP::parse_date $hdr->{"last-modified"}) {
		1424	utime $fh, $time, $time;
		1425	}
		1426
		1427	if ($status == 200 \|\| $status == 206 \|\| $status == 416) {
		1428	# download ok \|\| resume ok \|\| file already fully downloaded
		1429	$cb->(1, $hdr);
		1430
		1431	} elsif ($status == 412) {
		1432	# file has changed while resuming, delete and retry
		1433	unlink $file;
		1434	$cb->(0, $hdr);
		1435
		1436	} elsif ($status == 500 or $status == 503 or $status =~ /^59/) {
		1437	# retry later
		1438	$cb->(0, $hdr);
		1439
		1440	} else {
		1441	$cb->(undef, $hdr);
		1442	}
		1443	}
		1444	;
		1445	}
		1446
		1447	download "http://server/somelargefile", "/tmp/somelargefile", sub {
		1448	if ($_[0]) {
		1449	print "OK!\n";
		1450	} elsif (defined $_[0]) {
		1451	print "please retry later\n";
		1452	} else {
		1453	print "ERROR\n";
		1454	}
		1455	};
		1456
1141	=head2 SOCKS PROXIES	1457	=head3 SOCKS PROXIES
1142		1458
1143	Socks proxies are not directly supported by AnyEvent::HTTP. You can	1459	Socks proxies are not directly supported by AnyEvent::HTTP. You can
1144	compile your perl to support socks, or use an external program such as	1460	compile your perl to support socks, or use an external program such as
1145	F<socksify> (dante) or F<tsocks> to make your program use a socks proxy	1461	F<socksify> (dante) or F<tsocks> to make your program use a socks proxy
1146	transparently.	1462	transparently.

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Comparing AnyEvent-HTTP/HTTP.pm (file contents): Revision 1.82 by root, Sun Jan 2 04:50:40 2011 UTC vs. Revision 1.109 by root, Wed Jul 27 16:11:55 2011 UTC

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Comparing AnyEvent-HTTP/HTTP.pm (file contents):
Revision 1.82 by root, Sun Jan 2 04:50:40 2011 UTC vs.
Revision 1.109 by root, Wed Jul 27 16:11:55 2011 UTC