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Comparing AnyEvent-HTTP/HTTP.pm (file contents):
Revision 1.73 by root, Fri Dec 31 21:00:36 2010 UTC vs.
Revision 1.134 by root, Fri Sep 7 22:11:31 2018 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 = 2.24;
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, $headers)
73		68
74	Executes an HTTP-GET request. See the http_request function for details on	69	Executes an HTTP-GET request. See the http_request function for details on
…		…
94	C<http_request> returns a "cancellation guard" - you have to keep the	89	C<http_request> returns a "cancellation guard" - you have to keep the
95	object at least alive until the callback get called. If the object gets	90	object at least alive until the callback get called. If the object gets
96	destroyed before the callback is called, the request will be cancelled.	91	destroyed before the callback is called, the request will be cancelled.
97		92
98	The callback will be called with the response body data as first argument	93	The callback will be called with the response body data as first argument
99	(or C<undef> if an error occured), and a hash-ref with response headers	94	(or C<undef> if an error occurred), and a hash-ref with response headers
100	(and trailers) as second argument.	95	(and trailers) as second argument.
101		96
102	All the headers in that hash are lowercased. In addition to the response	97	All the headers in that hash are lowercased. In addition to the response
103	headers, the "pseudo-headers" (uppercase to avoid clashing with possible	98	headers, the "pseudo-headers" (uppercase to avoid clashing with possible
104	response headers) C<HTTPVersion>, C<Status> and C<Reason> contain the	99	response headers) C<HTTPVersion>, C<Status> and C<Reason> contain the
…		…
122		117
123	If the server sends a header multiple times, then their contents will be	118	If the server sends a header multiple times, then their contents will be
124	joined together with a comma (C<,>), as per the HTTP spec.	119	joined together with a comma (C<,>), as per the HTTP spec.
125		120
126	If an internal error occurs, such as not being able to resolve a hostname,	121	If an internal error occurs, such as not being able to resolve a hostname,
127	then C<$data> will be C<undef>, C<< $headers->{Status} >> will be C<59x>	122	then C<$data> will be C<undef>, C<< $headers->{Status} >> will be
128	(usually C<599>) and the C<Reason> pseudo-header will contain an error	123	C<590>-C<599> and the C<Reason> pseudo-header will contain an error
129	message.	124	message. Currently the following status codes are used:
		125
		126	=over 4
		127
		128	=item 595 - errors during connection establishment, proxy handshake.
		129
		130	=item 596 - errors during TLS negotiation, request sending and header processing.
		131
		132	=item 597 - errors during body receiving or processing.
		133
		134	=item 598 - user aborted request via C<on_header> or C<on_body>.
		135
		136	=item 599 - other, usually nonretryable, errors (garbled URL etc.).
		137
		138	=back
130		139
131	A typical callback might look like this:	140	A typical callback might look like this:
132		141
133	sub {	142	sub {
134	my ($body, $hdr) = @_;	143	my ($body, $hdr) = @_;
…		…
145		154
146	=over 4	155	=over 4
147		156
148	=item recurse => $count (default: $MAX_RECURSE)	157	=item recurse => $count (default: $MAX_RECURSE)
149		158
150	Whether to recurse requests or not, e.g. on redirects, authentication	159	Whether to recurse requests or not, e.g. on redirects, authentication and
151	retries and so on, and how often to do so.	160	other retries and so on, and how often to do so.
		161
		162	Only redirects to http and https URLs are supported. While most common
		163	redirection forms are handled entirely within this module, some require
		164	the use of the optional L<URI> module. If it is required but missing, then
		165	the request will fail with an error.
152		166
153	=item headers => hashref	167	=item headers => hashref
154		168
155	The request headers to use. Currently, C<http_request> may provide its own	169	The request headers to use. Currently, C<http_request> may provide its own
156	C<Host:>, C<Content-Length:>, C<Connection:> and C<Cookie:> headers and	170	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:>	171	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	172	(this can be suppressed by using C<undef> for these headers in which case
159	they won't be sent at all).	173	they won't be sent at all).
160		174
		175	You really should provide your own C<User-Agent:> header value that is
		176	appropriate for your program - I wouldn't be surprised if the default
		177	AnyEvent string gets blocked by webservers sooner or later.
		178
		179	Also, make sure that your headers names and values do not contain any
		180	embedded newlines.
		181
161	=item timeout => $seconds	182	=item timeout => $seconds
162		183
163	The time-out to use for various stages - each connect attempt will reset	184	The time-out to use for various stages - each connect attempt will reset
164	the timeout, as will read or write activity, i.e. this is not an overall	185	the timeout, as will read or write activity, i.e. this is not an overall
165	timeout.	186	timeout.
166		187
167	Default timeout is 5 minutes.	188	Default timeout is 5 minutes.
168		189
169	=item proxy => [$host, $port[, $scheme]] or undef	190	=item proxy => [$host, $port[, $scheme]] or undef
170		191
171	Use the given http proxy for all requests. If not specified, then the	192	Use the given http proxy for all requests, or no proxy if C<undef> is
172	default proxy (as specified by C<$ENV{http_proxy}>) is used.	193	used.
173		194
174	C<$scheme> must be either missing, C<http> for HTTP or C<https> for	195	C<$scheme> must be either missing or must be C<http> for HTTP.
175	HTTPS.	196
		197	If not specified, then the default proxy is used (see
		198	C<AnyEvent::HTTP::set_proxy>).
		199
		200	Currently, if your proxy requires authorization, you have to specify an
		201	appropriate "Proxy-Authorization" header in every request.
176		202
177	=item body => $string	203	=item body => $string
178		204
179	The request body, usually empty. Will be sent as-is (future versions of	205	The request body, usually empty. Will be sent as-is (future versions of
180	this module might offer more options).	206	this module might offer more options).
…		…
182	=item cookie_jar => $hash_ref	208	=item cookie_jar => $hash_ref
183		209
184	Passing this parameter enables (simplified) cookie-processing, loosely	210	Passing this parameter enables (simplified) cookie-processing, loosely
185	based on the original netscape specification.	211	based on the original netscape specification.
186		212
187	The C<$hash_ref> must be an (initially empty) hash reference which will	213	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	214	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	215	to persistent storage with something like JSON or Storable - see the
190	recommended, as session-only cookies might survive longer than expected.	216	C<AnyEvent::HTTP::cookie_jar_expire> function if you wish to remove
		217	expired or session-only cookies, and also for documentation on the format
		218	of the cookie jar.
191		219
192	Note that this cookie implementation is not meant to be complete. If	220	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	221	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	222	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	223	working. Cookies are a privacy disaster, do not use them unless required
196	to.	224	to.
197		225
198	When cookie processing is enabled, the C<Cookie:> and C<Set-Cookie:>	226	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	227	headers will be set and handled by this module, otherwise they will be
…		…
209	verification) TLS context.	237	verification) TLS context.
210		238
211	The default for this option is C<low>, which could be interpreted as "give	239	The default for this option is C<low>, which could be interpreted as "give
212	me the page, no matter what".	240	me the page, no matter what".
213		241
		242	See also the C<sessionid> parameter.
		243
		244	=item session => $string
		245
		246	The module might reuse connections to the same host internally. Sometimes
		247	(e.g. when using TLS), you do not want to reuse connections from other
		248	sessions. This can be achieved by setting this parameter to some unique
		249	ID (such as the address of an object storing your state data, or the TLS
		250	context) - only connections using the same unique ID will be reused.
		251
214	=item on_prepare => $callback->($fh)	252	=item on_prepare => $callback->($fh)
215		253
216	In rare cases you need to "tune" the socket before it is used to	254	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	255	connect (for example, to bind it on a given IP address). This parameter
218	overrides the prepare callback passed to C<AnyEvent::Socket::tcp_connect>	256	overrides the prepare callback passed to C<AnyEvent::Socket::tcp_connect>
219	and behaves exactly the same way (e.g. it has to provide a	257	and behaves exactly the same way (e.g. it has to provide a
220	timeout). See the description for the C<$prepare_cb> argument of	258	timeout). See the description for the C<$prepare_cb> argument of
221	C<AnyEvent::Socket::tcp_connect> for details.	259	C<AnyEvent::Socket::tcp_connect> for details.
222		260
…		…
225	In even rarer cases you want total control over how AnyEvent::HTTP	263	In even rarer cases you want total control over how AnyEvent::HTTP
226	establishes connections. Normally it uses L<AnyEvent::Socket::tcp_connect>	264	establishes connections. Normally it uses L<AnyEvent::Socket::tcp_connect>
227	to do this, but you can provide your own C<tcp_connect> function -	265	to do this, but you can provide your own C<tcp_connect> function -
228	obviously, it has to follow the same calling conventions, except that it	266	obviously, it has to follow the same calling conventions, except that it
229	may always return a connection guard object.	267	may always return a connection guard object.
		268
		269	The connections made by this hook will be treated as equivalent to
		270	connecitons made the built-in way, specifically, they will be put into
		271	and taken from the persistent conneciton cache. If your C<$tcp_connect>
		272	function is incompatible with this kind of re-use, consider switching off
		273	C<persistent> connections and/or providing a C<session> identifier.
230		274
231	There are probably lots of weird uses for this function, starting from	275	There are probably lots of weird uses for this function, starting from
232	tracing the hosts C<http_request> actually tries to connect, to (inexact	276	tracing the hosts C<http_request> actually tries to connect, to (inexact
233	but fast) host => IP address caching or even socks protocol support.	277	but fast) host => IP address caching or even socks protocol support.
234		278
…		…
287	called. Instead of the C<$body> argument containing the body data, the	331	called. Instead of the C<$body> argument containing the body data, the
288	callback will receive the L<AnyEvent::Handle> object associated with the	332	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	333	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.	334	(e.g. status C<304>), the empty string will be passed.
291		335
292	The handle object might or might not be in TLS mode, might be connected to	336	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	337	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	338	etc., and configured in unspecified ways. The user is responsible for this
295	module anymore).	339	handle (it will not be used by this module anymore).
296		340
297	This is useful with some push-type services, where, after the initial	341	This is useful with some push-type services, where, after the initial
298	headers, an interactive protocol is used (typical example would be the	342	headers, an interactive protocol is used (typical example would be the
299	push-style twitter API which starts a JSON/XML stream).	343	push-style twitter API which starts a JSON/XML stream).
300		344
301	If you think you need this, first have a look at C<on_body>, to see if	345	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.	346	that doesn't solve your problem in a better way.
		347
		348	=item persistent => $boolean
		349
		350	Try to create/reuse a persistent connection. When this flag is set
		351	(default: true for idempotent requests, false for all others), then
		352	C<http_request> tries to re-use an existing (previously-created)
		353	persistent connection to same host (i.e. identical URL scheme, hostname,
		354	port and session) and, failing that, tries to create a new one.
		355
		356	Requests failing in certain ways will be automatically retried once, which
		357	is dangerous for non-idempotent requests, which is why it defaults to off
		358	for them. The reason for this is because the bozos who designed HTTP/1.1
		359	made it impossible to distinguish between a fatal error and a normal
		360	connection timeout, so you never know whether there was a problem with
		361	your request or not.
		362
		363	When reusing an existent connection, many parameters (such as TLS context)
		364	will be ignored. See the C<session> parameter for a workaround.
		365
		366	=item keepalive => $boolean
		367
		368	Only used when C<persistent> is also true. This parameter decides whether
		369	C<http_request> tries to handshake a HTTP/1.0-style keep-alive connection
		370	(as opposed to only a HTTP/1.1 persistent connection).
		371
		372	The default is true, except when using a proxy, in which case it defaults
		373	to false, as HTTP/1.0 proxies cannot support this in a meaningful way.
		374
		375	=item handle_params => { key => value ... }
		376
		377	The key-value pairs in this hash will be passed to any L<AnyEvent::Handle>
		378	constructor that is called - not all requests will create a handle, and
		379	sometimes more than one is created, so this parameter is only good for
		380	setting hints.
		381
		382	Example: set the maximum read size to 4096, to potentially conserve memory
		383	at the cost of speed.
		384
		385	handle_params => {
		386	max_read_size => 4096,
		387	},
303		388
304	=back	389	=back
305		390
306	Example: do a simple HTTP GET request for http://www.nethype.de/ and print	391	Example: do a simple HTTP GET request for http://www.nethype.de/ and print
307	the response body.	392	the response body.
…		…
313		398
314	Example: do a HTTP HEAD request on https://www.google.com/, use a	399	Example: do a HTTP HEAD request on https://www.google.com/, use a
315	timeout of 30 seconds.	400	timeout of 30 seconds.
316		401
317	http_request	402	http_request
318	GET => "https://www.google.com",	403	HEAD => "https://www.google.com",
		404	headers => { "user-agent" => "MySearchClient 1.0" },
319	timeout => 30,	405	timeout => 30,
320	sub {	406	sub {
321	my ($body, $hdr) = @_;	407	my ($body, $hdr) = @_;
322	use Data::Dumper;	408	use Data::Dumper;
323	print Dumper $hdr;	409	print Dumper $hdr;
…		…
333	};	419	};
334		420
335	undef $request;	421	undef $request;
336		422
337	=cut	423	=cut
		424
		425	#############################################################################
		426	# wait queue/slots
338		427
339	sub _slot_schedule;	428	sub _slot_schedule;
340	sub _slot_schedule($) {	429	sub _slot_schedule($) {
341	my $host = shift;	430	my $host = shift;
342		431
…		…
364	push @{ $CO_SLOT{$_[0]}[1] }, $_[1];	453	push @{ $CO_SLOT{$_[0]}[1] }, $_[1];
365		454
366	_slot_schedule $_[0];	455	_slot_schedule $_[0];
367	}	456	}
368		457
		458	#############################################################################
		459	# cookie handling
		460
		461	# expire cookies
		462	sub cookie_jar_expire($;$) {
		463	my ($jar, $session_end) = @_;
		464
		465	%$jar = () if $jar->{version} != 2;
		466
		467	my $anow = AE::now;
		468
		469	while (my ($chost, $paths) = each %$jar) {
		470	next unless ref $paths;
		471
		472	while (my ($cpath, $cookies) = each %$paths) {
		473	while (my ($cookie, $kv) = each %$cookies) {
		474	if (exists $kv->{_expires}) {
		475	delete $cookies->{$cookie}
		476	if $anow > $kv->{_expires};
		477	} elsif ($session_end) {
		478	delete $cookies->{$cookie};
		479	}
		480	}
		481
		482	delete $paths->{$cpath}
		483	unless %$cookies;
		484	}
		485
		486	delete $jar->{$chost}
		487	unless %$paths;
		488	}
		489	}
		490
369	# extract cookies from jar	491	# extract cookies from jar
370	sub cookie_jar_extract($$$$) {	492	sub cookie_jar_extract($$$$) {
371	my ($jar, $uscheme, $uhost, $upath) = @_;	493	my ($jar, $scheme, $host, $path) = @_;
372		494
373	%$jar = () if $jar->{version} != 1;	495	%$jar = () if $jar->{version} != 2;
		496
		497	$host = AnyEvent::Util::idn_to_ascii $host
		498	if $host =~ /[^\x00-\x7f]/;
374		499
375	my @cookies;	500	my @cookies;
376		501
377	while (my ($chost, $paths) = each %$jar) {	502	while (my ($chost, $paths) = each %$jar) {
378	next unless ref $paths;	503	next unless ref $paths;
379		504
380	if ($chost =~ /^\./) {	505	# exact match or suffix including . match
381	next unless $chost eq substr $uhost, -length $chost;	506	$chost eq $host or ".$chost" eq substr $host, -1 - length $chost
382	} elsif ($chost =~ /\./) {
383	next unless $chost eq $uhost;
384	} else {
385	next;	507	or next;
386	}
387		508
388	while (my ($cpath, $cookies) = each %$paths) {	509	while (my ($cpath, $cookies) = each %$paths) {
389	next unless $cpath eq substr $upath, 0, length $cpath;	510	next unless $cpath eq substr $path, 0, length $cpath;
390		511
391	while (my ($cookie, $kv) = each %$cookies) {	512	while (my ($cookie, $kv) = each %$cookies) {
392	next if $uscheme ne "https" && exists $kv->{secure};	513	next if $scheme ne "https" && exists $kv->{secure};
393		514
394	if (exists $kv->{expires}) {	515	if (exists $kv->{_expires} and AE::now > $kv->{_expires}) {
395	if (AE::now > parse_date ($kv->{expires})) {
396	delete $cookies->{$cookie};	516	delete $cookies->{$cookie};
397	next;	517	next;
398	}
399	}	518	}
400		519
401	my $value = $kv->{value};	520	my $value = $kv->{value};
402		521
403	if ($value =~ /[=;,[:space:]]/) {	522	if ($value =~ /[=;,[:space:]]/) {
…		…
412		531
413	\@cookies	532	\@cookies
414	}	533	}
415		534
416	# parse set_cookie header into jar	535	# parse set_cookie header into jar
417	sub cookie_jar_set_cookie($$$) {	536	sub cookie_jar_set_cookie($$$$) {
418	my ($jar, $set_cookie, $uhost) = @_;	537	my ($jar, $set_cookie, $host, $date) = @_;
		538
		539	%$jar = () if $jar->{version} != 2;
		540
		541	my $anow = int AE::now;
		542	my $snow; # server-now
419		543
420	for ($set_cookie) {	544	for ($set_cookie) {
421	# parse NAME=VALUE	545	# parse NAME=VALUE
422	my @kv;	546	my @kv;
423		547
		548	# expires is not http-compliant in the original cookie-spec,
		549	# we support the official date format and some extensions
424	while (	550	while (
425	m{	551	m{
426	\G\s*	552	\G\s*
427	(?:	553	(?:
428	expires \s*=\s* ([A-Z][a-z][a-z],\ [^,;]+)	554	expires \s*=\s* ([A-Z][a-z][a-z]+,\ [^,;]+)
429	| ([^=;,[:space:]]+) \s*=\s* (?: "((?:[^\\"]+|\\.)*)" | ([^=;,[:space:]]*) )	555	| ([^=;,[:space:]]+) (?: \s*=\s* (?: "((?:[^\\"]+|\\.)*)" | ([^;,[:space:]]*) ) )?
430	)	556	)
431	}gcxsi	557	}gcxsi
432	) {	558	) {
433	my $name = $2;	559	my $name = $2;
434	my $value = $4;	560	my $value = $4;
435		561
436	unless (defined $name) {	562	if (defined $1) {
437	# expires	563	# expires
438	$name = "expires";	564	$name = "expires";
439	$value = $1;	565	$value = $1;
440	} elsif (!defined $value) {	566	} elsif (defined $3) {
441	# quoted	567	# quoted
442	$value = $3;	568	$value = $3;
443	$value =~ s/\\(.)/$1/gs;	569	$value =~ s/\\(.)/$1/gs;
444	}	570	}
445		571
446	push @kv, lc $name, $value;	572	push @kv, @kv ? lc $name : $name, $value;
447		573
448	last unless /\G\s*;/gc;	574	last unless /\G\s*;/gc;
449	}	575	}
450		576
451	last unless @kv;	577	last unless @kv;
452		578
453	my $name = shift @kv;	579	my $name = shift @kv;
454	my %kv = (value => shift @kv, @kv);	580	my %kv = (value => shift @kv, @kv);
455		581
456	$kv{expires} ||= format_date (AE::now + $kv{"max-age"})
457	if exists $kv{"max-age"};	582	if (exists $kv{"max-age"}) {
		583	$kv{_expires} = $anow + delete $kv{"max-age"};
		584	} elsif (exists $kv{expires}) {
		585	$snow ||= parse_date ($date) || $anow;
		586	$kv{_expires} = $anow + (parse_date (delete $kv{expires}) - $snow);
		587	} else {
		588	delete $kv{_expires};
		589	}
458		590
459	my $cdom;	591	my $cdom;
460	my $cpath = (delete $kv{path}) || "/";	592	my $cpath = (delete $kv{path}) || "/";
461		593
462	if (exists $kv{domain}) {	594	if (exists $kv{domain}) {
463	$cdom = delete $kv{domain};	595	$cdom = $kv{domain};
464		596
465	$cdom =~ s/^\.?/./; # make sure it starts with a "."	597	$cdom =~ s/^\.?/./; # make sure it starts with a "."
466		598
467	next if $cdom =~ /\.$/;	599	next if $cdom =~ /\.$/;
468		600
469	# this is not rfc-like and not netscape-like. go figure.	601	# this is not rfc-like and not netscape-like. go figure.
470	my $ndots = $cdom =~ y/.//;	602	my $ndots = $cdom =~ y/.//;
471	next if $ndots < ($cdom =~ /\.[^.][^.]\.[^.][^.]$/ ? 3 : 2);	603	next if $ndots < ($cdom =~ /\.[^.][^.]\.[^.][^.]$/ ? 3 : 2);
		604
		605	$cdom = substr $cdom, 1; # remove initial .
472	} else {	606	} else {
473	$cdom = $uhost;	607	$cdom = $host;
474	}	608	}
475		609
476	# store it	610	# store it
477	$jar->{version} = 1;	611	$jar->{version} = 2;
478	$jar->{$cdom}{$cpath}{$name} = \%kv;	612	$jar->{lc $cdom}{$cpath}{$name} = \%kv;
479		613
480	redo if /\G\s*,/gc;	614	redo if /\G\s*,/gc;
481	}	615	}
482	}	616	}
483		617
		618	#############################################################################
		619	# keepalive/persistent connection cache
		620
		621	# fetch a connection from the keepalive cache
		622	sub ka_fetch($) {
		623	my $ka_key = shift;
		624
		625	my $hdl = pop @{ $KA_CACHE{$ka_key} }; # currently we reuse the MOST RECENTLY USED connection
		626	delete $KA_CACHE{$ka_key}
		627	unless @{ $KA_CACHE{$ka_key} };
		628
		629	$hdl
		630	}
		631
		632	sub ka_store($$) {
		633	my ($ka_key, $hdl) = @_;
		634
		635	my $kaa = $KA_CACHE{$ka_key} ||= [];
		636
		637	my $destroy = sub {
		638	my @ka = grep $_ != $hdl, @{ $KA_CACHE{$ka_key} };
		639
		640	$hdl->destroy;
		641
		642	@ka
		643	? $KA_CACHE{$ka_key} = \@ka
		644	: delete $KA_CACHE{$ka_key};
		645	};
		646
		647	# on error etc., destroy
		648	$hdl->on_error ($destroy);
		649	$hdl->on_eof ($destroy);
		650	$hdl->on_read ($destroy);
		651	$hdl->timeout ($PERSISTENT_TIMEOUT);
		652
		653	push @$kaa, $hdl;
		654	shift @$kaa while @$kaa > $MAX_PER_HOST;
		655	}
		656
		657	#############################################################################
		658	# utilities
		659
484	# continue to parse $_ for headers and place them into the arg	660	# continue to parse $_ for headers and place them into the arg
485	sub parse_hdr() {	661	sub _parse_hdr() {
486	my %hdr;	662	my %hdr;
487		663
488	# things seen, not parsed:	664	# things seen, not parsed:
489	# p3pP="NON CUR OTPi OUR NOR UNI"	665	# p3pP="NON CUR OTPi OUR NOR UNI"
490		666
…		…
504	for values %hdr;	680	for values %hdr;
505		681
506	\%hdr	682	\%hdr
507	}	683	}
508		684
		685	#############################################################################
		686	# http_get
		687
509	our $qr_nlnl = qr{(?<![^\012])\015?\012};	688	our $qr_nlnl = qr{(?<![^\012])\015?\012};
510		689
511	our $TLS_CTX_LOW = { cache => 1, sslv2 => 1 };	690	our $TLS_CTX_LOW = { cache => 1, sslv2 => 1 };
512	our $TLS_CTX_HIGH = { cache => 1, verify => 1, verify_peername => "https" };	691	our $TLS_CTX_HIGH = { cache => 1, verify => 1, verify_peername => "https" };
		692
		693	# maybe it should just become a normal object :/
		694
		695	sub _destroy_state(\%) {
		696	my ($state) = @_;
		697
		698	$state->{handle}->destroy if $state->{handle};
		699	%$state = ();
		700	}
		701
		702	sub _error(\%$$) {
		703	my ($state, $cb, $hdr) = @_;
		704
		705	&_destroy_state ($state);
		706
		707	$cb->(undef, $hdr);
		708	()
		709	}
		710
		711	our %IDEMPOTENT = (
		712	DELETE => 1,
		713	GET => 1,
		714	HEAD => 1,
		715	OPTIONS => 1,
		716	PUT => 1,
		717	TRACE => 1,
		718
		719	ACL => 1,
		720	"BASELINE-CONTROL" => 1,
		721	BIND => 1,
		722	CHECKIN => 1,
		723	CHECKOUT => 1,
		724	COPY => 1,
		725	LABEL => 1,
		726	LINK => 1,
		727	MERGE => 1,
		728	MKACTIVITY => 1,
		729	MKCALENDAR => 1,
		730	MKCOL => 1,
		731	MKREDIRECTREF => 1,
		732	MKWORKSPACE => 1,
		733	MOVE => 1,
		734	ORDERPATCH => 1,
		735	PROPFIND => 1,
		736	PROPPATCH => 1,
		737	REBIND => 1,
		738	REPORT => 1,
		739	SEARCH => 1,
		740	UNBIND => 1,
		741	UNCHECKOUT => 1,
		742	UNLINK => 1,
		743	UNLOCK => 1,
		744	UPDATE => 1,
		745	UPDATEREDIRECTREF => 1,
		746	"VERSION-CONTROL" => 1,
		747	);
513		748
514	sub http_request($$@) {	749	sub http_request($$@) {
515	my $cb = pop;	750	my $cb = pop;
516	my ($method, $url, %arg) = @_;	751	my ($method, $url, %arg) = @_;
517		752
…		…
535	my $recurse = exists $arg{recurse} ? delete $arg{recurse} : $MAX_RECURSE;	770	my $recurse = exists $arg{recurse} ? delete $arg{recurse} : $MAX_RECURSE;
536		771
537	return $cb->(undef, { @pseudo, Status => 599, Reason => "Too many redirections" })	772	return $cb->(undef, { @pseudo, Status => 599, Reason => "Too many redirections" })
538	if $recurse < 0;	773	if $recurse < 0;
539		774
540	my $proxy = $arg{proxy} || $PROXY;	775	my $proxy = exists $arg{proxy} ? $arg{proxy} : $PROXY;
541	my $timeout = $arg{timeout} || $TIMEOUT;	776	my $timeout = $arg{timeout} || $TIMEOUT;
542		777
543	my ($uscheme, $uauthority, $upath, $query, $fragment) =	778	my ($uscheme, $uauthority, $upath, $query, undef) = # ignore fragment
544	$url =~ m|(?:([^:/?#]+):)?(?://([^/?#]*))?([^?#]*)(?:(\?[^#]*))?(?:#(.*))?|;	779	$url =~ m|^([^:]+):(?://([^/?#]*))?([^?#]*)(?:(\?[^#]*))?(?:#(.*))?$|;
545		780
546	$uscheme = lc $uscheme;	781	$uscheme = lc $uscheme;
547		782
548	my $uport = $uscheme eq "http" ? 80	783	my $uport = $uscheme eq "http" ? 80
549	: $uscheme eq "https" ? 443	784	: $uscheme eq "https" ? 443
550	: return $cb->(undef, { @pseudo, Status => 599, Reason => "Only http and https URL schemes supported" });	785	: return $cb->(undef, { @pseudo, Status => 599, Reason => "Only http and https URL schemes supported" });
551		786
552	$uauthority =~ /^(?: .*\@ )? ([^\@:]+) (?: : (\d+) )?$/x	787	$uauthority =~ /^(?: .*\@ )? ([^\@]+?) (?: : (\d+) )?$/x
553	or return $cb->(undef, { @pseudo, Status => 599, Reason => "Unparsable URL" });	788	or return $cb->(undef, { @pseudo, Status => 599, Reason => "Unparsable URL" });
554		789
555	my $uhost = $1;	790	my $uhost = lc $1;
556	$uport = $2 if defined $2;	791	$uport = $2 if defined $2;
557		792
558	$hdr{host} = defined $2 ? "$uhost:$2" : "$uhost"	793	$hdr{host} = defined $2 ? "$uhost:$2" : "$uhost"
559	unless exists $hdr{host};	794	unless exists $hdr{host};
560		795
…		…
579	$rscheme = "http" unless defined $rscheme;	814	$rscheme = "http" unless defined $rscheme;
580		815
581	# don't support https requests over https-proxy transport,	816	# don't support https requests over https-proxy transport,
582	# can't be done with tls as spec'ed, unless you double-encrypt.	817	# can't be done with tls as spec'ed, unless you double-encrypt.
583	$rscheme = "http" if $uscheme eq "https" && $rscheme eq "https";	818	$rscheme = "http" if $uscheme eq "https" && $rscheme eq "https";
		819
		820	$rhost = lc $rhost;
		821	$rscheme = lc $rscheme;
584	} else {	822	} else {
585	($rhost, $rport, $rscheme, $rpath) = ($uhost, $uport, $uscheme, $upath);	823	($rhost, $rport, $rscheme, $rpath) = ($uhost, $uport, $uscheme, $upath);
586	}	824	}
587		825
588	# leave out fragment and query string, just a heuristic	826	# leave out fragment and query string, just a heuristic
…		…
590	$hdr{"user-agent"} = $USERAGENT unless exists $hdr{"user-agent"};	828	$hdr{"user-agent"} = $USERAGENT unless exists $hdr{"user-agent"};
591		829
592	$hdr{"content-length"} = length $arg{body}	830	$hdr{"content-length"} = length $arg{body}
593	if length $arg{body} || $method ne "GET";	831	if length $arg{body} || $method ne "GET";
594		832
595	$hdr{connection} = "close TE"; #1.1	833	my $idempotent = $IDEMPOTENT{$method};
		834
		835	# default value for keepalive is true iff the request is for an idempotent method
		836	my $persistent = exists $arg{persistent} ? !!$arg{persistent} : $idempotent;
		837	my $keepalive = exists $arg{keepalive} ? !!$arg{keepalive} : !$proxy;
		838	my $was_persistent; # true if this is actually a recycled connection
		839
		840	# the key to use in the keepalive cache
		841	my $ka_key = "$uscheme\x00$uhost\x00$uport\x00$arg{sessionid}";
		842
		843	$hdr{connection} = ($persistent ? $keepalive ? "keep-alive, " : "" : "close, ") . "Te"; #1.1
596	$hdr{te} = "trailers" unless exists $hdr{te}; #1.1	844	$hdr{te} = "trailers" unless exists $hdr{te}; #1.1
597		845
598	my %state = (connect_guard => 1);	846	my %state = (connect_guard => 1);
		847
		848	my $ae_error = 595; # connecting
		849
		850	# handle actual, non-tunneled, request
		851	my $handle_actual_request = sub {
		852	$ae_error = 596; # request phase
		853
		854	my $hdl = $state{handle};
		855
		856	$hdl->starttls ("connect") if $uscheme eq "https" && !exists $hdl->{tls};
		857
		858	# send request
		859	$hdl->push_write (
		860	"$method $rpath HTTP/1.1\015\012"
		861	. (join "", map "\u$_: $hdr{$_}\015\012", grep defined $hdr{$_}, keys %hdr)
		862	. "\015\012"
		863	. $arg{body}
		864	);
		865
		866	# return if error occurred during push_write()
		867	return unless %state;
		868
		869	# reduce memory usage, save a kitten, also re-use it for the response headers.
		870	%hdr = ();
		871
		872	# status line and headers
		873	$state{read_response} = sub {
		874	return unless %state;
		875
		876	for ("$_[1]") {
		877	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
		878
		879	/^HTTP\/0*([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\012]*) )? \012/gxci
		880	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Invalid server response" };
		881
		882	# 100 Continue handling
		883	# should not happen as we don't send expect: 100-continue,
		884	# but we handle it just in case.
		885	# since we send the request body regardless, if we get an error
		886	# we are out of-sync, which we currently do NOT handle correctly.
		887	return $state{handle}->push_read (line => $qr_nlnl, $state{read_response})
		888	if $2 eq 100;
		889
		890	push @pseudo,
		891	HTTPVersion => $1,
		892	Status => $2,
		893	Reason => $3,
		894	;
		895
		896	my $hdr = _parse_hdr
		897	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Garbled response headers" };
		898
		899	%hdr = (%$hdr, @pseudo);
		900	}
		901
		902	# redirect handling
		903	# relative uri handling forced by microsoft and other shitheads.
		904	# we give our best and fall back to URI if available.
		905	if (exists $hdr{location}) {
		906	my $loc = $hdr{location};
		907
		908	if ($loc =~ m%^//%) { # //
		909	$loc = "$uscheme:$loc";
		910
		911	} elsif ($loc eq "") {
		912	$loc = $url;
		913
		914	} elsif ($loc !~ /^(?: $ | [^:\/?\#]+ : )/x) { # anything "simple"
		915	$loc =~ s/^\.\/+//;
		916
		917	if ($loc !~ m%^[.?#]%) {
		918	my $prefix = "$uscheme://$uauthority";
		919
		920	unless ($loc =~ s/^\///) {
		921	$prefix .= $upath;
		922	$prefix =~ s/\/[^\/]*$//;
		923	}
		924
		925	$loc = "$prefix/$loc";
		926
		927	} elsif (eval { require URI }) { # uri
		928	$loc = URI->new_abs ($loc, $url)->as_string;
		929
		930	} else {
		931	return _error %state, $cb, { @pseudo, Status => 599, Reason => "Cannot parse Location (URI module missing)" };
		932	#$hdr{Status} = 599;
		933	#$hdr{Reason} = "Unparsable Redirect (URI module missing)";
		934	#$recurse = 0;
		935	}
		936	}
		937
		938	$hdr{location} = $loc;
		939	}
		940
		941	my $redirect;
		942
		943	if ($recurse) {
		944	my $status = $hdr{Status};
		945
		946	# industry standard is to redirect POST as GET for
		947	# 301, 302 and 303, in contrast to HTTP/1.0 and 1.1.
		948	# also, the UA should ask the user for 301 and 307 and POST,
		949	# industry standard seems to be to simply follow.
		950	# we go with the industry standard. 308 is defined
		951	# by rfc7538
		952	if ($status == 301 or $status == 302 or $status == 303) {
		953	$redirect = 1;
		954	# HTTP/1.1 is unclear on how to mutate the method
		955	unless ($method eq "HEAD") {
		956	$method = "GET";
		957	delete $arg{body};
		958	}
		959	} elsif ($status == 307 or $status == 308) {
		960	$redirect = 1;
		961	}
		962	}
		963
		964	my $finish = sub { # ($data, $err_status, $err_reason[, $persistent])
		965	if ($state{handle}) {
		966	# handle keepalive
		967	if (
		968	$persistent
		969	&& $_[3]
		970	&& ($hdr{HTTPVersion} < 1.1
		971	? $hdr{connection} =~ /\bkeep-?alive\b/i
		972	: $hdr{connection} !~ /\bclose\b/i)
		973	) {
		974	ka_store $ka_key, delete $state{handle};
		975	} else {
		976	# no keepalive, destroy the handle
		977	$state{handle}->destroy;
		978	}
		979	}
		980
		981	%state = ();
		982
		983	if (defined $_[1]) {
		984	$hdr{OrigStatus} = $hdr{Status}; $hdr{Status} = $_[1];
		985	$hdr{OrigReason} = $hdr{Reason}; $hdr{Reason} = $_[2];
		986	}
		987
		988	# set-cookie processing
		989	if ($arg{cookie_jar}) {
		990	cookie_jar_set_cookie $arg{cookie_jar}, $hdr{"set-cookie"}, $uhost, $hdr{date};
		991	}
		992
		993	if ($redirect && exists $hdr{location}) {
		994	# we ignore any errors, as it is very common to receive
		995	# Content-Length != 0 but no actual body
		996	# we also access %hdr, as $_[1] might be an erro
		997	$state{recurse} =
		998	http_request (
		999	$method => $hdr{location},
		1000	%arg,
		1001	recurse => $recurse - 1,
		1002	Redirect => [$_[0], \%hdr],
		1003	sub {
		1004	%state = ();
		1005	&$cb
		1006	},
		1007	);
		1008	} else {
		1009	$cb->($_[0], \%hdr);
		1010	}
		1011	};
		1012
		1013	$ae_error = 597; # body phase
		1014
		1015	my $chunked = $hdr{"transfer-encoding"} =~ /\bchunked\b/i; # not quite correct...
		1016
		1017	my $len = $chunked ? undef : $hdr{"content-length"};
		1018
		1019	# body handling, many different code paths
		1020	# - no body expected
		1021	# - want_body_handle
		1022	# - te chunked
		1023	# - 2x length known (with or without on_body)
		1024	# - 2x length not known (with or without on_body)
		1025	if (!$redirect && $arg{on_header} && !$arg{on_header}(\%hdr)) {
		1026	$finish->(undef, 598 => "Request cancelled by on_header");
		1027	} elsif (
		1028	$hdr{Status} =~ /^(?:1..|204|205|304)$/
		1029	or $method eq "HEAD"
		1030	or (defined $len && $len == 0) # == 0, not !, because "0 " is true
		1031	) {
		1032	# no body
		1033	$finish->("", undef, undef, 1);
		1034
		1035	} elsif (!$redirect && $arg{want_body_handle}) {
		1036	$_[0]->on_eof (undef);
		1037	$_[0]->on_error (undef);
		1038	$_[0]->on_read (undef);
		1039
		1040	$finish->(delete $state{handle});
		1041
		1042	} elsif ($chunked) {
		1043	my $cl = 0;
		1044	my $body = "";
		1045	my $on_body = (!$redirect && $arg{on_body}) || sub { $body .= shift; 1 };
		1046
		1047	$state{read_chunk} = sub {
		1048	$_[1] =~ /^([0-9a-fA-F]+)/
		1049	or return $finish->(undef, $ae_error => "Garbled chunked transfer encoding");
		1050
		1051	my $len = hex $1;
		1052
		1053	if ($len) {
		1054	$cl += $len;
		1055
		1056	$_[0]->push_read (chunk => $len, sub {
		1057	$on_body->($_[1], \%hdr)
		1058	or return $finish->(undef, 598 => "Request cancelled by on_body");
		1059
		1060	$_[0]->push_read (line => sub {
		1061	length $_[1]
		1062	and return $finish->(undef, $ae_error => "Garbled chunked transfer encoding");
		1063	$_[0]->push_read (line => $state{read_chunk});
		1064	});
		1065	});
		1066	} else {
		1067	$hdr{"content-length"} ||= $cl;
		1068
		1069	$_[0]->push_read (line => $qr_nlnl, sub {
		1070	if (length $_[1]) {
		1071	for ("$_[1]") {
		1072	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
		1073
		1074	my $hdr = _parse_hdr
		1075	or return $finish->(undef, $ae_error => "Garbled response trailers");
		1076
		1077	%hdr = (%hdr, %$hdr);
		1078	}
		1079	}
		1080
		1081	$finish->($body, undef, undef, 1);
		1082	});
		1083	}
		1084	};
		1085
		1086	$_[0]->push_read (line => $state{read_chunk});
		1087
		1088	} elsif (!$redirect && $arg{on_body}) {
		1089	if (defined $len) {
		1090	$_[0]->on_read (sub {
		1091	$len -= length $_[0]{rbuf};
		1092
		1093	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
		1094	or return $finish->(undef, 598 => "Request cancelled by on_body");
		1095
		1096	$len > 0
		1097	or $finish->("", undef, undef, 1);
		1098	});
		1099	} else {
		1100	$_[0]->on_eof (sub {
		1101	$finish->("");
		1102	});
		1103	$_[0]->on_read (sub {
		1104	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
		1105	or $finish->(undef, 598 => "Request cancelled by on_body");
		1106	});
		1107	}
		1108	} else {
		1109	$_[0]->on_eof (undef);
		1110
		1111	if (defined $len) {
		1112	$_[0]->on_read (sub {
		1113	$finish->((substr delete $_[0]{rbuf}, 0, $len, ""), undef, undef, 1)
		1114	if $len <= length $_[0]{rbuf};
		1115	});
		1116	} else {
		1117	$_[0]->on_error (sub {
		1118	($! == Errno::EPIPE || !$!)
		1119	? $finish->(delete $_[0]{rbuf})
		1120	: $finish->(undef, $ae_error => $_[2]);
		1121	});
		1122	$_[0]->on_read (sub { });
		1123	}
		1124	}
		1125	};
		1126
		1127	# if keepalive is enabled, then the server closing the connection
		1128	# before a response can happen legally - we retry on idempotent methods.
		1129	if ($was_persistent && $idempotent) {
		1130	my $old_eof = $hdl->{on_eof};
		1131	$hdl->{on_eof} = sub {
		1132	_destroy_state %state;
		1133
		1134	%state = ();
		1135	$state{recurse} =
		1136	http_request (
		1137	$method => $url,
		1138	%arg,
		1139	recurse => $recurse - 1,
		1140	persistent => 0,
		1141	sub {
		1142	%state = ();
		1143	&$cb
		1144	}
		1145	);
		1146	};
		1147	$hdl->on_read (sub {
		1148	return unless %state;
		1149
		1150	# as soon as we receive something, a connection close
		1151	# once more becomes a hard error
		1152	$hdl->{on_eof} = $old_eof;
		1153	$hdl->push_read (line => $qr_nlnl, $state{read_response});
		1154	});
		1155	} else {
		1156	$hdl->push_read (line => $qr_nlnl, $state{read_response});
		1157	}
		1158	};
		1159
		1160	my $prepare_handle = sub {
		1161	my ($hdl) = $state{handle};
		1162
		1163	$hdl->on_error (sub {
		1164	_error %state, $cb, { @pseudo, Status => $ae_error, Reason => $_[2] };
		1165	});
		1166	$hdl->on_eof (sub {
		1167	_error %state, $cb, { @pseudo, Status => $ae_error, Reason => "Unexpected end-of-file" };
		1168	});
		1169	$hdl->timeout_reset;
		1170	$hdl->timeout ($timeout);
		1171	};
		1172
		1173	# connected to proxy (or origin server)
		1174	my $connect_cb = sub {
		1175	my $fh = shift
		1176	or return _error %state, $cb, { @pseudo, Status => $ae_error, Reason => "$!" };
		1177
		1178	return unless delete $state{connect_guard};
		1179
		1180	# get handle
		1181	$state{handle} = new AnyEvent::Handle
		1182	%{ $arg{handle_params} },
		1183	fh => $fh,
		1184	peername => $uhost,
		1185	tls_ctx => $arg{tls_ctx},
		1186	;
		1187
		1188	$prepare_handle->();
		1189
		1190	#$state{handle}->starttls ("connect") if $rscheme eq "https";
		1191
		1192	# now handle proxy-CONNECT method
		1193	if ($proxy && $uscheme eq "https") {
		1194	# oh dear, we have to wrap it into a connect request
		1195
		1196	my $auth = exists $hdr{"proxy-authorization"}
		1197	? "proxy-authorization: " . (delete $hdr{"proxy-authorization"}) . "\015\012"
		1198	: "";
		1199
		1200	# maybe re-use $uauthority with patched port?
		1201	$state{handle}->push_write ("CONNECT $uhost:$uport HTTP/1.0\015\012$auth\015\012");
		1202	$state{handle}->push_read (line => $qr_nlnl, sub {
		1203	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix
		1204	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Invalid proxy connect response ($_[1])" };
		1205
		1206	if ($2 == 200) {
		1207	$rpath = $upath;
		1208	$handle_actual_request->();
		1209	} else {
		1210	_error %state, $cb, { @pseudo, Status => $2, Reason => $3 };
		1211	}
		1212	});
		1213	} else {
		1214	delete $hdr{"proxy-authorization"} unless $proxy;
		1215
		1216	$handle_actual_request->();
		1217	}
		1218	};
599		1219
600	_get_slot $uhost, sub {	1220	_get_slot $uhost, sub {
601	$state{slot_guard} = shift;	1221	$state{slot_guard} = shift;
602		1222
603	return unless $state{connect_guard};	1223	return unless $state{connect_guard};
604		1224
605	my $connect_cb = sub {	1225	# try to use an existing keepalive connection, but only if we, ourselves, plan
606	$state{fh} = shift	1226	# on a keepalive request (in theory, this should be a separate config option).
607	or do {	1227	if ($persistent && $KA_CACHE{$ka_key}) {
608	my $err = "$!";	1228	$was_persistent = 1;
609	%state = ();
610	return $cb->(undef, { @pseudo, Status => 599, Reason => $err });
611	};
612		1229
613	pop; # free memory, save a tree	1230	$state{handle} = ka_fetch $ka_key;
614		1231	# $state{handle}->destroyed
615	return unless delete $state{connect_guard};	1232	# and die "AnyEvent::HTTP: unexpectedly got a destructed handle (1), please report.";#d#
616		1233	$prepare_handle->();
617	# get handle	1234	# $state{handle}->destroyed
618	$state{handle} = new AnyEvent::Handle	1235	# and die "AnyEvent::HTTP: unexpectedly got a destructed handle (2), please report.";#d#
619	fh => $state{fh},
620	peername => $rhost,
621	tls_ctx => $arg{tls_ctx},
622	# these need to be reconfigured on keepalive handles
623	timeout => $timeout,
624	on_error => sub {
625	%state = ();
626	$cb->(undef, { @pseudo, Status => 599, Reason => $_[2] });
627	},
628	on_eof => sub {
629	%state = ();
630	$cb->(undef, { @pseudo, Status => 599, Reason => "Unexpected end-of-file" });
631	},
632	;
633
634	# limit the number of persistent connections
635	# keepalive not yet supported
636	# if ($KA_COUNT{$_[1]} < $MAX_PERSISTENT_PER_HOST) {
637	# ++$KA_COUNT{$_[1]};
638	# $state{handle}{ka_count_guard} = AnyEvent::Util::guard {
639	# --$KA_COUNT{$_[1]}
640	# };
641	# $hdr{connection} = "keep-alive";
642	# }
643
644	$state{handle}->starttls ("connect") if $rscheme eq "https";
645
646	# handle actual, non-tunneled, request
647	my $handle_actual_request = sub {
648	$state{handle}->starttls ("connect") if $uscheme eq "https" && !exists $state{handle}{tls};
649
650	# send request
651	$state{handle}->push_write (
652	"$method $rpath HTTP/1.1\015\012"
653	. (join "", map "\u$_: $hdr{$_}\015\012", grep defined $hdr{$_}, keys %hdr)
654	. "\015\012"
655	. (delete $arg{body})
656	);
657
658	# return if error occured during push_write()
659	return unless %state;
660
661	%hdr = (); # reduce memory usage, save a kitten, also make it possible to re-use
662
663	# status line and headers
664	$state{read_response} = sub {
665	for ("$_[1]") {
666	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
667
668	/^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\012]*) )? \012/igxc
669	or return (%state = (), $cb->(undef, { @pseudo, Status => 599, Reason => "Invalid server response" }));
670
671	# 100 Continue handling
672	# should not happen as we don't send expect: 100-continue,
673	# but we handle it just in case.
674	# since we send the request body regardless, if we get an error
675	# we are out of-sync, which we currently do NOT handle correctly.
676	return $state{handle}->push_read (line => $qr_nlnl, $state{read_response})
677	if $2 eq 100;
678
679	push @pseudo,
680	HTTPVersion => $1,
681	Status => $2,
682	Reason => $3,
683	;
684
685	my $hdr = parse_hdr
686	or return (%state = (), $cb->(undef, { @pseudo, Status => 599, Reason => "Garbled response headers" }));
687
688	%hdr = (%$hdr, @pseudo);
689	}
690
691	# redirect handling
692	# microsoft and other shitheads don't give a shit for following standards,
693	# try to support some common forms of broken Location headers.
694	if ($hdr{location} !~ /^(?: $ | [^:\/?\#]+ : )/x) {
695	$hdr{location} =~ s/^\.\/+//;
696
697	my $url = "$rscheme://$uhost:$uport";
698
699	unless ($hdr{location} =~ s/^\///) {
700	$url .= $upath;
701	$url =~ s/\/[^\/]*$//;
702	}
703
704	$hdr{location} = "$url/$hdr{location}";
705	}
706
707	my $redirect;
708
709	if ($recurse) {
710	my $status = $hdr{Status};
711
712	# industry standard is to redirect POST as GET for
713	# 301, 302 and 303, in contrast to http/1.0 and 1.1.
714	# also, the UA should ask the user for 301 and 307 and POST,
715	# industry standard seems to be to simply follow.
716	# we go with the industry standard.
717	if ($status == 301 or $status == 302 or $status == 303) {
718	# HTTP/1.1 is unclear on how to mutate the method
719	$method = "GET" unless $method eq "HEAD";
720	$redirect = 1;
721	} elsif ($status == 307) {
722	$redirect = 1;
723	}
724	}
725
726	my $finish = sub { # ($data, $err_status, $err_reason[, $keepalive])
727	my $keepalive = pop;
728
729	$state{handle}->destroy if $state{handle};
730	%state = ();
731
732	if (defined $_[1]) {
733	$hdr{OrigStatus} = $hdr{Status}; $hdr{Status} = $_[1];
734	$hdr{OrigReason} = $hdr{Reason}; $hdr{Reason} = $_[2];
735	}
736
737	# set-cookie processing
738	if ($arg{cookie_jar}) {
739	cookie_jar_set_cookie $arg{cookie_jar}, $hdr{"set-cookie"}, $uhost;
740	}
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;	1236	$handle_actual_request->();
889	} else {	1237
890	%state = ();
891	$cb->(undef, { @pseudo, Status => $2, Reason => $3 });
892	}
893	});
894	} else {	1238	} else {
895	&$handle_actual_request;
896	}
897	};
898
899	my $tcp_connect = $arg{tcp_connect}	1239	my $tcp_connect = $arg{tcp_connect}
900	|| do { require AnyEvent::Socket; \&AnyEvent::Socket::tcp_connect };	1240	|| do { require AnyEvent::Socket; \&AnyEvent::Socket::tcp_connect };
901		1241
902	$state{connect_guard} = $tcp_connect->($rhost, $rport, $connect_cb, $arg{on_prepare} || sub { $timeout });	1242	$state{connect_guard} = $tcp_connect->($rhost, $rport, $connect_cb, $arg{on_prepare} || sub { $timeout });
903		1243	}
904	};	1244	};
905		1245
906	defined wantarray && AnyEvent::Util::guard { %state = () }	1246	defined wantarray && AnyEvent::Util::guard { _destroy_state %state }
907	}	1247	}
908		1248
909	sub http_get($@) {	1249	sub http_get($@) {
910	unshift @_, "GET";	1250	unshift @_, "GET";
911	&http_request	1251	&http_request
…		…
929	AnyEvent::HTTP uses the AnyEvent::Socket::tcp_connect function for	1269	AnyEvent::HTTP uses the AnyEvent::Socket::tcp_connect function for
930	the actual connection, which in turn uses AnyEvent::DNS to resolve	1270	the actual connection, which in turn uses AnyEvent::DNS to resolve
931	hostnames. The latter is a simple stub resolver and does no caching	1271	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	1272	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	1273	your own default resolver (by storing a suitable resolver object in
934	C<$AnyEvent::DNS::RESOLVER>).	1274	C<$AnyEvent::DNS::RESOLVER>) or your own C<tcp_connect> callback.
935		1275
936	=head2 GLOBAL FUNCTIONS AND VARIABLES	1276	=head2 GLOBAL FUNCTIONS AND VARIABLES
937		1277
938	=over 4	1278	=over 4
939		1279
940	=item AnyEvent::HTTP::set_proxy "proxy-url"	1280	=item AnyEvent::HTTP::set_proxy "proxy-url"
941		1281
942	Sets the default proxy server to use. The proxy-url must begin with a	1282	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	1283	string of the form C<http://host:port>, croaks otherwise.
944	otherwise.
945		1284
946	To clear an already-set proxy, use C<undef>.	1285	To clear an already-set proxy, use C<undef>.
		1286
		1287	When AnyEvent::HTTP is loaded for the first time it will query the
		1288	default proxy from the operating system, currently by looking at
		1289	C<$ENV{http_proxy>}.
		1290
		1291	=item AnyEvent::HTTP::cookie_jar_expire $jar[, $session_end]
		1292
		1293	Remove all cookies from the cookie jar that have been expired. If
		1294	C<$session_end> is given and true, then additionally remove all session
		1295	cookies.
		1296
		1297	You should call this function (with a true C<$session_end>) before you
		1298	save cookies to disk, and you should call this function after loading them
		1299	again. If you have a long-running program you can additionally call this
		1300	function from time to time.
		1301
		1302	A cookie jar is initially an empty hash-reference that is managed by this
		1303	module. Its format is subject to change, but currently it is as follows:
		1304
		1305	The key C<version> has to contain C<2>, otherwise the hash gets
		1306	cleared. All other keys are hostnames or IP addresses pointing to
		1307	hash-references. The key for these inner hash references is the
		1308	server path for which this cookie is meant, and the values are again
		1309	hash-references. Each key of those hash-references is a cookie name, and
		1310	the value, you guessed it, is another hash-reference, this time with the
		1311	key-value pairs from the cookie, except for C<expires> and C<max-age>,
		1312	which have been replaced by a C<_expires> key that contains the cookie
		1313	expiry timestamp. Session cookies are indicated by not having an
		1314	C<_expires> key.
		1315
		1316	Here is an example of a cookie jar with a single cookie, so you have a
		1317	chance of understanding the above paragraph:
		1318
		1319	{
		1320	version => 2,
		1321	"10.0.0.1" => {
		1322	"/" => {
		1323	"mythweb_id" => {
		1324	_expires => 1293917923,
		1325	value => "ooRung9dThee3ooyXooM1Ohm",
		1326	},
		1327	},
		1328	},
		1329	}
947		1330
948	=item $date = AnyEvent::HTTP::format_date $timestamp	1331	=item $date = AnyEvent::HTTP::format_date $timestamp
949		1332
950	Takes a POSIX timestamp (seconds since the epoch) and formats it as a HTTP	1333	Takes a POSIX timestamp (seconds since the epoch) and formats it as a HTTP
951	Date (RFC 2616).	1334	Date (RFC 2616).
952		1335
953	=item $timestamp = AnyEvent::HTTP::parse_date $date	1336	=item $timestamp = AnyEvent::HTTP::parse_date $date
954		1337
955	Takes a HTTP Date (RFC 2616) or a Cookie date (netscape cookie spec) and	1338	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	1339	bunch of minor variations of those, and returns the corresponding POSIX
957	be parsed.	1340	timestamp, or C<undef> if the date cannot be parsed.
958		1341
959	=item $AnyEvent::HTTP::MAX_RECURSE	1342	=item $AnyEvent::HTTP::MAX_RECURSE
960		1343
961	The default value for the C<recurse> request parameter (default: C<10>).	1344	The default value for the C<recurse> request parameter (default: C<10>).
		1345
		1346	=item $AnyEvent::HTTP::TIMEOUT
		1347
		1348	The default timeout for connection operations (default: C<300>).
962		1349
963	=item $AnyEvent::HTTP::USERAGENT	1350	=item $AnyEvent::HTTP::USERAGENT
964		1351
965	The default value for the C<User-Agent> header (the default is	1352	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)>).	1353	C<Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>).
967		1354
968	=item $AnyEvent::HTTP::MAX_PER_HOST	1355	=item $AnyEvent::HTTP::MAX_PER_HOST
969		1356
970	The maximum number of concurrent connections to the same host (identified	1357	The maximum number of concurrent connections to the same host (identified
971	by the hostname). If the limit is exceeded, then the additional requests	1358	by the hostname). If the limit is exceeded, then additional requests
972	are queued until previous connections are closed.	1359	are queued until previous connections are closed. Both persistent and
		1360	non-persistent connections are counted in this limit.
973		1361
974	The default value for this is C<4>, and it is highly advisable to not	1362	The default value for this is C<4>, and it is highly advisable to not
975	increase it.	1363	increase it much.
		1364
		1365	For comparison: the RFC's recommend 4 non-persistent or 2 persistent
		1366	connections, older browsers used 2, newer ones (such as firefox 3)
		1367	typically use 6, and Opera uses 8 because like, they have the fastest
		1368	browser and give a shit for everybody else on the planet.
		1369
		1370	=item $AnyEvent::HTTP::PERSISTENT_TIMEOUT
		1371
		1372	The time after which idle persistent connections get closed by
		1373	AnyEvent::HTTP (default: C<3>).
976		1374
977	=item $AnyEvent::HTTP::ACTIVE	1375	=item $AnyEvent::HTTP::ACTIVE
978		1376
979	The number of active connections. This is not the number of currently	1377	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	1378	running requests, but the number of currently open and non-idle TCP
981	connections. This number of can be useful for load-leveling.	1379	connections. This number can be useful for load-leveling.
982		1380
983	=back	1381	=back
984		1382
985	=cut	1383	=cut
986		1384
…		…
1001	sub parse_date($) {	1399	sub parse_date($) {
1002	my ($date) = @_;	1400	my ($date) = @_;
1003		1401
1004	my ($d, $m, $y, $H, $M, $S);	1402	my ($d, $m, $y, $H, $M, $S);
1005		1403
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$/) {	1404	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 " ")	1405	# RFC 822/1123, required by RFC 2616 (with " ")
1008	# cookie dates (with "-")	1406	# cookie dates (with "-")
1009		1407
1010	($d, $m, $y, $H, $M, $S) = ($1, $2, $3, $4, $5, $6);	1408	($d, $m, $y, $H, $M, $S) = ($1, $2, $3, $4, $5, $6);
1011		1409
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$/) {	1410	} 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	1411	# RFC 850
1014	($d, $m, $y, $H, $M, $S) = ($1, $2, $3 < 69 ? $3 + 2000 : $3 + 1900, $4, $5, $6);	1412	($d, $m, $y, $H, $M, $S) = ($1, $2, $3 < 69 ? $3 + 2000 : $3 + 1900, $4, $5, $6);
1015		1413
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])$/) {	1414	} 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	1415	# ISO C's asctime
1018	($d, $m, $y, $H, $M, $S) = ($2, $1, $6, $3, $4, $5);	1416	($d, $m, $y, $H, $M, $S) = ($2, $1, $6, $3, $4, $5);
1019	}	1417	}
1020	# other formats fail in the loop below	1418	# other formats fail in the loop below
1021		1419
1022	for (0..11) {	1420	for (0..11) {
1023	if ($m eq $month[$_]) {	1421	if ($m eq $month[$_]) {
1024	require Time::Local;	1422	require Time::Local;
1025	return Time::Local::timegm ($S, $M, $H, $d, $_, $y);	1423	return eval { Time::Local::timegm ($S, $M, $H, $d, $_, $y) };
1026	}	1424	}
1027	}	1425	}
1028		1426
1029	undef	1427	undef
1030	}	1428	}
1031		1429
1032	sub set_proxy($) {	1430	sub set_proxy($) {
1033	if (length $_[0]) {	1431	if (length $_[0]) {
1034	$_[0] =~ m%^(https?):// ([^:/]+) (?: : (\d*) )?%ix	1432	$_[0] =~ m%^(http):// ([^:/]+) (?: : (\d*) )?%ix
1035	or Carp::croak "$_[0]: invalid proxy URL";	1433	or Carp::croak "$_[0]: invalid proxy URL";
1036	$PROXY = [$2, $3 || 3128, $1]	1434	$PROXY = [$2, $3 || 3128, $1]
1037	} else {	1435	} else {
1038	undef $PROXY;	1436	undef $PROXY;
1039	}	1437	}
…		…
1042	# initialise proxy from environment	1440	# initialise proxy from environment
1043	eval {	1441	eval {
1044	set_proxy $ENV{http_proxy};	1442	set_proxy $ENV{http_proxy};
1045	};	1443	};
1046		1444
		1445	=head2 SHOWCASE
		1446
		1447	This section contains some more elaborate "real-world" examples or code
		1448	snippets.
		1449
		1450	=head2 HTTP/1.1 FILE DOWNLOAD
		1451
		1452	Downloading files with HTTP can be quite tricky, especially when something
		1453	goes wrong and you want to resume.
		1454
		1455	Here is a function that initiates and resumes a download. It uses the
		1456	last modified time to check for file content changes, and works with many
		1457	HTTP/1.0 servers as well, and usually falls back to a complete re-download
		1458	on older servers.
		1459
		1460	It calls the completion callback with either C<undef>, which means a
		1461	nonretryable error occurred, C<0> when the download was partial and should
		1462	be retried, and C<1> if it was successful.
		1463
		1464	use AnyEvent::HTTP;
		1465
		1466	sub download($$$) {
		1467	my ($url, $file, $cb) = @_;
		1468
		1469	open my $fh, "+<", $file
		1470	or die "$file: $!";
		1471
		1472	my %hdr;
		1473	my $ofs = 0;
		1474
		1475	if (stat $fh and -s _) {
		1476	$ofs = -s _;
		1477	warn "-s is ", $ofs;
		1478	$hdr{"if-unmodified-since"} = AnyEvent::HTTP::format_date +(stat _)[9];
		1479	$hdr{"range"} = "bytes=$ofs-";
		1480	}
		1481
		1482	http_get $url,
		1483	headers => \%hdr,
		1484	on_header => sub {
		1485	my ($hdr) = @_;
		1486
		1487	if ($hdr->{Status} == 200 && $ofs) {
		1488	# resume failed
		1489	truncate $fh, $ofs = 0;
		1490	}
		1491
		1492	sysseek $fh, $ofs, 0;
		1493
		1494	1
		1495	},
		1496	on_body => sub {
		1497	my ($data, $hdr) = @_;
		1498
		1499	if ($hdr->{Status} =~ /^2/) {
		1500	length $data == syswrite $fh, $data
		1501	or return; # abort on write errors
		1502	}
		1503
		1504	1
		1505	},
		1506	sub {
		1507	my (undef, $hdr) = @_;
		1508
		1509	my $status = $hdr->{Status};
		1510
		1511	if (my $time = AnyEvent::HTTP::parse_date $hdr->{"last-modified"}) {
		1512	utime $time, $time, $fh;
		1513	}
		1514
		1515	if ($status == 200 || $status == 206 || $status == 416) {
		1516	# download ok || resume ok || file already fully downloaded
		1517	$cb->(1, $hdr);
		1518
		1519	} elsif ($status == 412) {
		1520	# file has changed while resuming, delete and retry
		1521	unlink $file;
		1522	$cb->(0, $hdr);
		1523
		1524	} elsif ($status == 500 or $status == 503 or $status =~ /^59/) {
		1525	# retry later
		1526	$cb->(0, $hdr);
		1527
		1528	} else {
		1529	$cb->(undef, $hdr);
		1530	}
		1531	}
		1532	;
		1533	}
		1534
		1535	download "http://server/somelargefile", "/tmp/somelargefile", sub {
		1536	if ($_[0]) {
		1537	print "OK!\n";
		1538	} elsif (defined $_[0]) {
		1539	print "please retry later\n";
		1540	} else {
		1541	print "ERROR\n";
		1542	}
		1543	};
		1544
1047	=head2 SOCKS PROXIES	1545	=head3 SOCKS PROXIES
1048		1546
1049	Socks proxies are not directly supported by AnyEvent::HTTP. You can	1547	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	1548	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	1549	F<socksify> (dante) or F<tsocks> to make your program use a socks proxy
1052	transparently.	1550	transparently.

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