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Comparing AnyEvent-HTTP/HTTP.pm (file contents):
Revision 1.59 by root, Wed Dec 29 23:59:36 2010 UTC vs.
Revision 1.122 by root, Fri May 8 17:28:39 2015 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 = '1.46';	51	our $VERSION = 2.21;
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 as	94	(or C<undef> if an error occurred), and a hash-ref with response headers
100	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
105	three parts of the HTTP Status-Line of the same name.	100	three parts of the HTTP Status-Line of the same name. If an error occurs
		101	during the body phase of a request, then the original C<Status> and
		102	C<Reason> values from the header are available as C<OrigStatus> and
		103	C<OrigReason>.
106		104
107	The pseudo-header C<URL> contains the actual URL (which can differ from	105	The pseudo-header C<URL> contains the actual URL (which can differ from
108	the requested URL when following redirects - for example, you might get	106	the requested URL when following redirects - for example, you might get
109	an error that your URL scheme is not supported even though your URL is a	107	an error that your URL scheme is not supported even though your URL is a
110	valid http URL because it redirected to an ftp URL, in which case you can	108	valid http URL because it redirected to an ftp URL, in which case you can
…		…
119		117
120	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
121	joined together with a comma (C<,>), as per the HTTP spec.	119	joined together with a comma (C<,>), as per the HTTP spec.
122		120
123	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,
124	then C<$data> will be C<undef>, C<< $headers->{Status} >> will be C<59x>	122	then C<$data> will be C<undef>, C<< $headers->{Status} >> will be
125	(usually C<599>) and the C<Reason> pseudo-header will contain an error	123	C<590>-C<599> and the C<Reason> pseudo-header will contain an error
126	message.	124	message. Currently the following status codes are used:
		125
		126	=over 4
		127
		128	=item 595 - errors during connection establishment, proxy handshake.
		129
		130	=item 596 - errors during TLS negotiation, request sending and header processing.
		131
		132	=item 597 - errors during body receiving or processing.
		133
		134	=item 598 - user aborted request via C<on_header> or C<on_body>.
		135
		136	=item 599 - other, usually nonretryable, errors (garbled URL etc.).
		137
		138	=back
127		139
128	A typical callback might look like this:	140	A typical callback might look like this:
129		141
130	sub {	142	sub {
131	my ($body, $hdr) = @_;	143	my ($body, $hdr) = @_;
…		…
142		154
143	=over 4	155	=over 4
144		156
145	=item recurse => $count (default: $MAX_RECURSE)	157	=item recurse => $count (default: $MAX_RECURSE)
146		158
147	Whether to recurse requests or not, e.g. on redirects, authentication	159	Whether to recurse requests or not, e.g. on redirects, authentication and
148	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.
149		166
150	=item headers => hashref	167	=item headers => hashref
151		168
152	The request headers to use. Currently, C<http_request> may provide its	169	The request headers to use. Currently, C<http_request> may provide its own
153	own C<Host:>, C<Content-Length:>, C<Connection:> and C<Cookie:> headers	170	C<Host:>, C<Content-Length:>, C<Connection:> and C<Cookie:> headers and
154	and will provide defaults for C<User-Agent:> and C<Referer:> (this can be	171	will provide defaults at least for C<TE:>, C<Referer:> and C<User-Agent:>
155	suppressed by using C<undef> for these headers in which case they won't be	172	(this can be suppressed by using C<undef> for these headers in which case
156	sent at all).	173	they won't be sent at all).
		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.
157		181
158	=item timeout => $seconds	182	=item timeout => $seconds
159		183
160	The time-out to use for various stages - each connect attempt will reset	184	The time-out to use for various stages - each connect attempt will reset
161	the timeout, as will read or write activity, i.e. this is not an overall	185	the timeout, as will read or write activity, i.e. this is not an overall
…		…
163		187
164	Default timeout is 5 minutes.	188	Default timeout is 5 minutes.
165		189
166	=item proxy => [$host, $port[, $scheme]] or undef	190	=item proxy => [$host, $port[, $scheme]] or undef
167		191
168	Use the given http proxy for all requests. If not specified, then the	192	Use the given http proxy for all requests, or no proxy if C<undef> is
169	default proxy (as specified by C<$ENV{http_proxy}>) is used.	193	used.
170		194
171	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.
172	HTTPS.	196
		197	If not specified, then the default proxy is used (see
		198	C<AnyEvent::HTTP::set_proxy>).
173		199
174	=item body => $string	200	=item body => $string
175		201
176	The request body, usually empty. Will be-sent as-is (future versions of	202	The request body, usually empty. Will be sent as-is (future versions of
177	this module might offer more options).	203	this module might offer more options).
178		204
179	=item cookie_jar => $hash_ref	205	=item cookie_jar => $hash_ref
180		206
181	Passing this parameter enables (simplified) cookie-processing, loosely	207	Passing this parameter enables (simplified) cookie-processing, loosely
182	based on the original netscape specification.	208	based on the original netscape specification.
183		209
184	The C<$hash_ref> must be an (initially empty) hash reference which will	210	The C<$hash_ref> must be an (initially empty) hash reference which
185	get updated automatically. It is possible to save the cookie_jar to	211	will get updated automatically. It is possible to save the cookie jar
186	persistent storage with something like JSON or Storable, but this is not	212	to persistent storage with something like JSON or Storable - see the
187	recommended, as expiry times are currently being ignored.	213	C<AnyEvent::HTTP::cookie_jar_expire> function if you wish to remove
		214	expired or session-only cookies, and also for documentation on the format
		215	of the cookie jar.
188		216
189	Note that this cookie implementation is not of very high quality, nor	217	Note that this cookie implementation is not meant to be complete. If
190	meant to be complete. If you want complete cookie management you have to	218	you want complete cookie management you have to do that on your
191	do that on your own. C<cookie_jar> is meant as a quick fix to get some	219	own. C<cookie_jar> is meant as a quick fix to get most cookie-using sites
192	cookie-using sites working. Cookies are a privacy disaster, do not use	220	working. Cookies are a privacy disaster, do not use them unless required
193	them unless required to.	221	to.
		222
		223	When cookie processing is enabled, the C<Cookie:> and C<Set-Cookie:>
		224	headers will be set and handled by this module, otherwise they will be
		225	left untouched.
194		226
195	=item tls_ctx => $scheme | $tls_ctx	227	=item tls_ctx => $scheme | $tls_ctx
196		228
197	Specifies the AnyEvent::TLS context to be used for https connections. This	229	Specifies the AnyEvent::TLS context to be used for https connections. This
198	parameter follows the same rules as the C<tls_ctx> parameter to	230	parameter follows the same rules as the C<tls_ctx> parameter to
…		…
202	verification) TLS context.	234	verification) TLS context.
203		235
204	The default for this option is C<low>, which could be interpreted as "give	236	The default for this option is C<low>, which could be interpreted as "give
205	me the page, no matter what".	237	me the page, no matter what".
206		238
		239	See also the C<sessionid> parameter.
		240
		241	=item session => $string
		242
		243	The module might reuse connections to the same host internally. Sometimes
		244	(e.g. when using TLS), you do not want to reuse connections from other
		245	sessions. This can be achieved by setting this parameter to some unique
		246	ID (such as the address of an object storing your state data, or the TLS
		247	context) - only connections using the same unique ID will be reused.
		248
207	=item on_prepare => $callback->($fh)	249	=item on_prepare => $callback->($fh)
208		250
209	In rare cases you need to "tune" the socket before it is used to	251	In rare cases you need to "tune" the socket before it is used to
210	connect (for exmaple, to bind it on a given IP address). This parameter	252	connect (for example, to bind it on a given IP address). This parameter
211	overrides the prepare callback passed to C<AnyEvent::Socket::tcp_connect>	253	overrides the prepare callback passed to C<AnyEvent::Socket::tcp_connect>
212	and behaves exactly the same way (e.g. it has to provide a	254	and behaves exactly the same way (e.g. it has to provide a
213	timeout). See the description for the C<$prepare_cb> argument of	255	timeout). See the description for the C<$prepare_cb> argument of
214	C<AnyEvent::Socket::tcp_connect> for details.	256	C<AnyEvent::Socket::tcp_connect> for details.
215		257
216	=item tcp_connect => $callback->($host, $service, $connect_cb, $prepare_cb)	258	=item tcp_connect => $callback->($host, $service, $connect_cb, $prepare_cb)
217		259
218	In even rarer cases you want total control over how AnyEvent::HTTP	260	In even rarer cases you want total control over how AnyEvent::HTTP
219	establishes connections. Normally it uses L<AnyEvent::Socket::tcp_connect>	261	establishes connections. Normally it uses L<AnyEvent::Socket::tcp_connect>
220	to do this, but you can provide your own C<tcp_connect> function -	262	to do this, but you can provide your own C<tcp_connect> function -
221	obviously, it has to follow the same calling conventions.	263	obviously, it has to follow the same calling conventions, except that it
		264	may always return a connection guard object.
222		265
223	There are probably lots of weird uses for this function, starting from	266	There are probably lots of weird uses for this function, starting from
224	tracing the hosts C<http_request> actually tries to connect, to (inexact	267	tracing the hosts C<http_request> actually tries to connect, to (inexact
225	but fast) host => IP address caching or even socks protocol support.	268	but fast) host => IP address caching or even socks protocol support.
226		269
…		…
236		279
237	This callback is useful, among other things, to quickly reject unwanted	280	This callback is useful, among other things, to quickly reject unwanted
238	content, which, if it is supposed to be rare, can be faster than first	281	content, which, if it is supposed to be rare, can be faster than first
239	doing a C<HEAD> request.	282	doing a C<HEAD> request.
240		283
		284	The downside is that cancelling the request makes it impossible to re-use
		285	the connection. Also, the C<on_header> callback will not receive any
		286	trailer (headers sent after the response body).
		287
241	Example: cancel the request unless the content-type is "text/html".	288	Example: cancel the request unless the content-type is "text/html".
242		289
243	on_header => sub {	290	on_header => sub {
244	$_[0]{"content-type"} =~ /^text\/html\s*(?:;|$)/	291	$_[0]{"content-type"} =~ /^text\/html\s*(?:;|$)/
245	},	292	},
…		…
251	string instead of the body data.	298	string instead of the body data.
252		299
253	It has to return either true (in which case AnyEvent::HTTP will continue),	300	It has to return either true (in which case AnyEvent::HTTP will continue),
254	or false, in which case AnyEvent::HTTP will cancel the download (and call	301	or false, in which case AnyEvent::HTTP will cancel the download (and call
255	the completion callback with an error code of C<598>).	302	the completion callback with an error code of C<598>).
		303
		304	The downside to cancelling the request is that it makes it impossible to
		305	re-use the connection.
256		306
257	This callback is useful when the data is too large to be held in memory	307	This callback is useful when the data is too large to be held in memory
258	(so the callback writes it to a file) or when only some information should	308	(so the callback writes it to a file) or when only some information should
259	be extracted, or when the body should be processed incrementally.	309	be extracted, or when the body should be processed incrementally.
260		310
…		…
272	called. Instead of the C<$body> argument containing the body data, the	322	called. Instead of the C<$body> argument containing the body data, the
273	callback will receive the L<AnyEvent::Handle> object associated with the	323	callback will receive the L<AnyEvent::Handle> object associated with the
274	connection. In error cases, C<undef> will be passed. When there is no body	324	connection. In error cases, C<undef> will be passed. When there is no body
275	(e.g. status C<304>), the empty string will be passed.	325	(e.g. status C<304>), the empty string will be passed.
276		326
277	The handle object might or might not be in TLS mode, might be connected to	327	The handle object might or might not be in TLS mode, might be connected
278	a proxy, be a persistent connection etc., and configured in unspecified	328	to a proxy, be a persistent connection, use chunked transfer encoding
279	ways. The user is responsible for this handle (it will not be used by this	329	etc., and configured in unspecified ways. The user is responsible for this
280	module anymore).	330	handle (it will not be used by this module anymore).
281		331
282	This is useful with some push-type services, where, after the initial	332	This is useful with some push-type services, where, after the initial
283	headers, an interactive protocol is used (typical example would be the	333	headers, an interactive protocol is used (typical example would be the
284	push-style twitter API which starts a JSON/XML stream).	334	push-style twitter API which starts a JSON/XML stream).
285		335
286	If you think you need this, first have a look at C<on_body>, to see if	336	If you think you need this, first have a look at C<on_body>, to see if
287	that doesn't solve your problem in a better way.	337	that doesn't solve your problem in a better way.
288		338
		339	=item persistent => $boolean
		340
		341	Try to create/reuse a persistent connection. When this flag is set
		342	(default: true for idempotent requests, false for all others), then
		343	C<http_request> tries to re-use an existing (previously-created)
		344	persistent connection to the host and, failing that, tries to create a new
		345	one.
		346
		347	Requests failing in certain ways will be automatically retried once, which
		348	is dangerous for non-idempotent requests, which is why it defaults to off
		349	for them. The reason for this is because the bozos who designed HTTP/1.1
		350	made it impossible to distinguish between a fatal error and a normal
		351	connection timeout, so you never know whether there was a problem with
		352	your request or not.
		353
		354	When reusing an existent connection, many parameters (such as TLS context)
		355	will be ignored. See the C<session> parameter for a workaround.
		356
		357	=item keepalive => $boolean
		358
		359	Only used when C<persistent> is also true. This parameter decides whether
		360	C<http_request> tries to handshake a HTTP/1.0-style keep-alive connection
		361	(as opposed to only a HTTP/1.1 persistent connection).
		362
		363	The default is true, except when using a proxy, in which case it defaults
		364	to false, as HTTP/1.0 proxies cannot support this in a meaningful way.
		365
		366	=item handle_params => { key => value ... }
		367
		368	The key-value pairs in this hash will be passed to any L<AnyEvent::Handle>
		369	constructor that is called - not all requests will create a handle, and
		370	sometimes more than one is created, so this parameter is only good for
		371	setting hints.
		372
		373	Example: set the maximum read size to 4096, to potentially conserve memory
		374	at the cost of speed.
		375
		376	handle_params => {
		377	max_read_size => 4096,
		378	},
		379
289	=back	380	=back
290		381
291	Example: make a simple HTTP GET request for http://www.nethype.de/	382	Example: do a simple HTTP GET request for http://www.nethype.de/ and print
		383	the response body.
292		384
293	http_request GET => "http://www.nethype.de/", sub {	385	http_request GET => "http://www.nethype.de/", sub {
294	my ($body, $hdr) = @_;	386	my ($body, $hdr) = @_;
295	print "$body\n";	387	print "$body\n";
296	};	388	};
297		389
298	Example: make a HTTP HEAD request on https://www.google.com/, use a	390	Example: do a HTTP HEAD request on https://www.google.com/, use a
299	timeout of 30 seconds.	391	timeout of 30 seconds.
300		392
301	http_request	393	http_request
302	GET => "https://www.google.com",	394	HEAD => "https://www.google.com",
		395	headers => { "user-agent" => "MySearchClient 1.0" },
303	timeout => 30,	396	timeout => 30,
304	sub {	397	sub {
305	my ($body, $hdr) = @_;	398	my ($body, $hdr) = @_;
306	use Data::Dumper;	399	use Data::Dumper;
307	print Dumper $hdr;	400	print Dumper $hdr;
308	}	401	}
309	;	402	;
310		403
311	Example: make another simple HTTP GET request, but immediately try to	404	Example: do another simple HTTP GET request, but immediately try to
312	cancel it.	405	cancel it.
313		406
314	my $request = http_request GET => "http://www.nethype.de/", sub {	407	my $request = http_request GET => "http://www.nethype.de/", sub {
315	my ($body, $hdr) = @_;	408	my ($body, $hdr) = @_;
316	print "$body\n";	409	print "$body\n";
317	};	410	};
318		411
319	undef $request;	412	undef $request;
320		413
321	=cut	414	=cut
		415
		416	#############################################################################
		417	# wait queue/slots
322		418
323	sub _slot_schedule;	419	sub _slot_schedule;
324	sub _slot_schedule($) {	420	sub _slot_schedule($) {
325	my $host = shift;	421	my $host = shift;
326		422
…		…
348	push @{ $CO_SLOT{$_[0]}[1] }, $_[1];	444	push @{ $CO_SLOT{$_[0]}[1] }, $_[1];
349		445
350	_slot_schedule $_[0];	446	_slot_schedule $_[0];
351	}	447	}
352		448
		449	#############################################################################
		450	# cookie handling
		451
		452	# expire cookies
		453	sub cookie_jar_expire($;$) {
		454	my ($jar, $session_end) = @_;
		455
		456	%$jar = () if $jar->{version} != 1;
		457
		458	my $anow = AE::now;
		459
		460	while (my ($chost, $paths) = each %$jar) {
		461	next unless ref $paths;
		462
		463	while (my ($cpath, $cookies) = each %$paths) {
		464	while (my ($cookie, $kv) = each %$cookies) {
		465	if (exists $kv->{_expires}) {
		466	delete $cookies->{$cookie}
		467	if $anow > $kv->{_expires};
		468	} elsif ($session_end) {
		469	delete $cookies->{$cookie};
		470	}
		471	}
		472
		473	delete $paths->{$cpath}
		474	unless %$cookies;
		475	}
		476
		477	delete $jar->{$chost}
		478	unless %$paths;
		479	}
		480	}
		481
		482	# extract cookies from jar
		483	sub cookie_jar_extract($$$$) {
		484	my ($jar, $scheme, $host, $path) = @_;
		485
		486	%$jar = () if $jar->{version} != 1;
		487
		488	my @cookies;
		489
		490	while (my ($chost, $paths) = each %$jar) {
		491	next unless ref $paths;
		492
		493	if ($chost =~ /^\./) {
		494	next unless $chost eq substr $host, -length $chost;
		495	} elsif ($chost =~ /\./) {
		496	next unless $chost eq $host;
		497	} else {
		498	next;
		499	}
		500
		501	while (my ($cpath, $cookies) = each %$paths) {
		502	next unless $cpath eq substr $path, 0, length $cpath;
		503
		504	while (my ($cookie, $kv) = each %$cookies) {
		505	next if $scheme ne "https" && exists $kv->{secure};
		506
		507	if (exists $kv->{_expires} and AE::now > $kv->{_expires}) {
		508	delete $cookies->{$cookie};
		509	next;
		510	}
		511
		512	my $value = $kv->{value};
		513
		514	if ($value =~ /[=;,[:space:]]/) {
		515	$value =~ s/([\\"])/\\$1/g;
		516	$value = "\"$value\"";
		517	}
		518
		519	push @cookies, "$cookie=$value";
		520	}
		521	}
		522	}
		523
		524	\@cookies
		525	}
		526
		527	# parse set_cookie header into jar
		528	sub cookie_jar_set_cookie($$$$) {
		529	my ($jar, $set_cookie, $host, $date) = @_;
		530
		531	my $anow = int AE::now;
		532	my $snow; # server-now
		533
		534	for ($set_cookie) {
		535	# parse NAME=VALUE
		536	my @kv;
		537
		538	# expires is not http-compliant in the original cookie-spec,
		539	# we support the official date format and some extensions
		540	while (
		541	m{
		542	\G\s*
		543	(?:
		544	expires \s*=\s* ([A-Z][a-z][a-z]+,\ [^,;]+)
		545	| ([^=;,[:space:]]+) (?: \s*=\s* (?: "((?:[^\\"]+|\\.)*)" | ([^;,[:space:]]*) ) )?
		546	)
		547	}gcxsi
		548	) {
		549	my $name = $2;
		550	my $value = $4;
		551
		552	if (defined $1) {
		553	# expires
		554	$name = "expires";
		555	$value = $1;
		556	} elsif (defined $3) {
		557	# quoted
		558	$value = $3;
		559	$value =~ s/\\(.)/$1/gs;
		560	}
		561
		562	push @kv, @kv ? lc $name : $name, $value;
		563
		564	last unless /\G\s*;/gc;
		565	}
		566
		567	last unless @kv;
		568
		569	my $name = shift @kv;
		570	my %kv = (value => shift @kv, @kv);
		571
		572	if (exists $kv{"max-age"}) {
		573	$kv{_expires} = $anow + delete $kv{"max-age"};
		574	} elsif (exists $kv{expires}) {
		575	$snow ||= parse_date ($date) || $anow;
		576	$kv{_expires} = $anow + (parse_date (delete $kv{expires}) - $snow);
		577	} else {
		578	delete $kv{_expires};
		579	}
		580
		581	my $cdom;
		582	my $cpath = (delete $kv{path}) || "/";
		583
		584	if (exists $kv{domain}) {
		585	$cdom = delete $kv{domain};
		586
		587	$cdom =~ s/^\.?/./; # make sure it starts with a "."
		588
		589	next if $cdom =~ /\.$/;
		590
		591	# this is not rfc-like and not netscape-like. go figure.
		592	my $ndots = $cdom =~ y/.//;
		593	next if $ndots < ($cdom =~ /\.[^.][^.]\.[^.][^.]$/ ? 3 : 2);
		594	} else {
		595	$cdom = $host;
		596	}
		597
		598	# store it
		599	$jar->{version} = 1;
		600	$jar->{lc $cdom}{$cpath}{$name} = \%kv;
		601
		602	redo if /\G\s*,/gc;
		603	}
		604	}
		605
		606	#############################################################################
		607	# keepalive/persistent connection cache
		608
		609	# fetch a connection from the keepalive cache
		610	sub ka_fetch($) {
		611	my $ka_key = shift;
		612
		613	my $hdl = pop @{ $KA_CACHE{$ka_key} }; # currently we reuse the MOST RECENTLY USED connection
		614	delete $KA_CACHE{$ka_key}
		615	unless @{ $KA_CACHE{$ka_key} };
		616
		617	$hdl
		618	}
		619
		620	sub ka_store($$) {
		621	my ($ka_key, $hdl) = @_;
		622
		623	my $kaa = $KA_CACHE{$ka_key} ||= [];
		624
		625	my $destroy = sub {
		626	my @ka = grep $_ != $hdl, @{ $KA_CACHE{$ka_key} };
		627
		628	$hdl->destroy;
		629
		630	@ka
		631	? $KA_CACHE{$ka_key} = \@ka
		632	: delete $KA_CACHE{$ka_key};
		633	};
		634
		635	# on error etc., destroy
		636	$hdl->on_error ($destroy);
		637	$hdl->on_eof ($destroy);
		638	$hdl->on_read ($destroy);
		639	$hdl->timeout ($PERSISTENT_TIMEOUT);
		640
		641	push @$kaa, $hdl;
		642	shift @$kaa while @$kaa > $MAX_PER_HOST;
		643	}
		644
		645	#############################################################################
		646	# utilities
		647
		648	# continue to parse $_ for headers and place them into the arg
		649	sub _parse_hdr() {
		650	my %hdr;
		651
		652	# things seen, not parsed:
		653	# p3pP="NON CUR OTPi OUR NOR UNI"
		654
		655	$hdr{lc $1} .= ",$2"
		656	while /\G
		657	([^:\000-\037]*):
		658	[\011\040]*
		659	((?: [^\012]+ | \012[\011\040] )*)
		660	\012
		661	/gxc;
		662
		663	/\G$/
		664	or return;
		665
		666	# remove the "," prefix we added to all headers above
		667	substr $_, 0, 1, ""
		668	for values %hdr;
		669
		670	\%hdr
		671	}
		672
		673	#############################################################################
		674	# http_get
		675
353	our $qr_nlnl = qr{(?<![^\012])\015?\012};	676	our $qr_nlnl = qr{(?<![^\012])\015?\012};
354		677
355	our $TLS_CTX_LOW = { cache => 1, sslv2 => 1 };	678	our $TLS_CTX_LOW = { cache => 1, sslv2 => 1 };
356	our $TLS_CTX_HIGH = { cache => 1, verify => 1, verify_peername => "https" };	679	our $TLS_CTX_HIGH = { cache => 1, verify => 1, verify_peername => "https" };
		680
		681	# maybe it should just become a normal object :/
		682
		683	sub _destroy_state(\%) {
		684	my ($state) = @_;
		685
		686	$state->{handle}->destroy if $state->{handle};
		687	%$state = ();
		688	}
		689
		690	sub _error(\%$$) {
		691	my ($state, $cb, $hdr) = @_;
		692
		693	&_destroy_state ($state);
		694
		695	$cb->(undef, $hdr);
		696	()
		697	}
		698
		699	our %IDEMPOTENT = (
		700	DELETE => 1,
		701	GET => 1,
		702	HEAD => 1,
		703	OPTIONS => 1,
		704	PUT => 1,
		705	TRACE => 1,
		706
		707	ACL => 1,
		708	"BASELINE-CONTROL" => 1,
		709	BIND => 1,
		710	CHECKIN => 1,
		711	CHECKOUT => 1,
		712	COPY => 1,
		713	LABEL => 1,
		714	LINK => 1,
		715	MERGE => 1,
		716	MKACTIVITY => 1,
		717	MKCALENDAR => 1,
		718	MKCOL => 1,
		719	MKREDIRECTREF => 1,
		720	MKWORKSPACE => 1,
		721	MOVE => 1,
		722	ORDERPATCH => 1,
		723	PROPFIND => 1,
		724	PROPPATCH => 1,
		725	REBIND => 1,
		726	REPORT => 1,
		727	SEARCH => 1,
		728	UNBIND => 1,
		729	UNCHECKOUT => 1,
		730	UNLINK => 1,
		731	UNLOCK => 1,
		732	UPDATE => 1,
		733	UPDATEREDIRECTREF => 1,
		734	"VERSION-CONTROL" => 1,
		735	);
357		736
358	sub http_request($$@) {	737	sub http_request($$@) {
359	my $cb = pop;	738	my $cb = pop;
360	my ($method, $url, %arg) = @_;	739	my ($method, $url, %arg) = @_;
361		740
…		…
376	my @pseudo = (URL => $url);	755	my @pseudo = (URL => $url);
377	push @pseudo, Redirect => delete $arg{Redirect} if exists $arg{Redirect};	756	push @pseudo, Redirect => delete $arg{Redirect} if exists $arg{Redirect};
378		757
379	my $recurse = exists $arg{recurse} ? delete $arg{recurse} : $MAX_RECURSE;	758	my $recurse = exists $arg{recurse} ? delete $arg{recurse} : $MAX_RECURSE;
380		759
381	return $cb->(undef, { Status => 599, Reason => "Too many redirections", @pseudo })	760	return $cb->(undef, { @pseudo, Status => 599, Reason => "Too many redirections" })
382	if $recurse < 0;	761	if $recurse < 0;
383		762
384	my $proxy = $arg{proxy} || $PROXY;	763	my $proxy = exists $arg{proxy} ? $arg{proxy} : $PROXY;
385	my $timeout = $arg{timeout} || $TIMEOUT;	764	my $timeout = $arg{timeout} || $TIMEOUT;
386		765
387	my ($uscheme, $uauthority, $upath, $query, $fragment) =	766	my ($uscheme, $uauthority, $upath, $query, undef) = # ignore fragment
388	$url =~ m|(?:([^:/?#]+):)?(?://([^/?#]*))?([^?#]*)(?:(\?[^#]*))?(?:#(.*))?|;	767	$url =~ m|^([^:]+):(?://([^/?#]*))?([^?#]*)(?:(\?[^#]*))?(?:#(.*))?$|;
389		768
390	$uscheme = lc $uscheme;	769	$uscheme = lc $uscheme;
391		770
392	my $uport = $uscheme eq "http" ? 80	771	my $uport = $uscheme eq "http" ? 80
393	: $uscheme eq "https" ? 443	772	: $uscheme eq "https" ? 443
394	: return $cb->(undef, { Status => 599, Reason => "Only http and https URL schemes supported", @pseudo });	773	: return $cb->(undef, { @pseudo, Status => 599, Reason => "Only http and https URL schemes supported" });
395		774
396	$uauthority =~ /^(?: .*\@ )? ([^\@:]+) (?: : (\d+) )?$/x	775	$uauthority =~ /^(?: .*\@ )? ([^\@:]+) (?: : (\d+) )?$/x
397	or return $cb->(undef, { Status => 599, Reason => "Unparsable URL", @pseudo });	776	or return $cb->(undef, { @pseudo, Status => 599, Reason => "Unparsable URL" });
398		777
399	my $uhost = $1;	778	my $uhost = lc $1;
400	$uport = $2 if defined $2;	779	$uport = $2 if defined $2;
401		780
402	$hdr{host} = defined $2 ? "$uhost:$2" : "$uhost"	781	$hdr{host} = defined $2 ? "$uhost:$2" : "$uhost"
403	unless exists $hdr{host};	782	unless exists $hdr{host};
404		783
…		…
407		786
408	$upath =~ s%^/?%/%;	787	$upath =~ s%^/?%/%;
409		788
410	# cookie processing	789	# cookie processing
411	if (my $jar = $arg{cookie_jar}) {	790	if (my $jar = $arg{cookie_jar}) {
412	%$jar = () if $jar->{version} != 1;	791	my $cookies = cookie_jar_extract $jar, $uscheme, $uhost, $upath;
413		792
414	my @cookie;
415
416	while (my ($chost, $v) = each %$jar) {
417	if ($chost =~ /^\./) {
418	next unless $chost eq substr $uhost, -length $chost;
419	} elsif ($chost =~ /\./) {
420	next unless $chost eq $uhost;
421	} else {
422	next;
423	}
424
425	while (my ($cpath, $v) = each %$v) {
426	next unless $cpath eq substr $upath, 0, length $cpath;
427
428	while (my ($k, $v) = each %$v) {
429	next if $uscheme ne "https" && exists $v->{secure};
430	my $value = $v->{value};
431	$value =~ s/([\\"])/\\$1/g;
432	push @cookie, "$k=\"$value\"";
433	}
434	}
435	}
436
437	$hdr{cookie} = join "; ", @cookie	793	$hdr{cookie} = join "; ", @$cookies
438	if @cookie;	794	if @$cookies;
439	}	795	}
440		796
441	my ($rhost, $rport, $rscheme, $rpath); # request host, port, path	797	my ($rhost, $rport, $rscheme, $rpath); # request host, port, path
442		798
443	if ($proxy) {	799	if ($proxy) {
…		…
446	$rscheme = "http" unless defined $rscheme;	802	$rscheme = "http" unless defined $rscheme;
447		803
448	# don't support https requests over https-proxy transport,	804	# don't support https requests over https-proxy transport,
449	# can't be done with tls as spec'ed, unless you double-encrypt.	805	# can't be done with tls as spec'ed, unless you double-encrypt.
450	$rscheme = "http" if $uscheme eq "https" && $rscheme eq "https";	806	$rscheme = "http" if $uscheme eq "https" && $rscheme eq "https";
		807
		808	$rhost = lc $rhost;
		809	$rscheme = lc $rscheme;
451	} else {	810	} else {
452	($rhost, $rport, $rscheme, $rpath) = ($uhost, $uport, $uscheme, $upath);	811	($rhost, $rport, $rscheme, $rpath) = ($uhost, $uport, $uscheme, $upath);
453	}	812	}
454		813
455	# leave out fragment and query string, just a heuristic	814	# leave out fragment and query string, just a heuristic
456	$hdr{referer} ||= "$uscheme://$uauthority$upath" unless exists $hdr{referer};	815	$hdr{referer} = "$uscheme://$uauthority$upath" unless exists $hdr{referer};
457	$hdr{"user-agent"} ||= $USERAGENT unless exists $hdr{"user-agent"};	816	$hdr{"user-agent"} = $USERAGENT unless exists $hdr{"user-agent"};
458		817
459	$hdr{"content-length"} = length $arg{body}	818	$hdr{"content-length"} = length $arg{body}
460	if length $arg{body} || $method ne "GET";	819	if length $arg{body} || $method ne "GET";
461		820
		821	my $idempotent = $IDEMPOTENT{$method};
		822
		823	# default value for keepalive is true iff the request is for an idempotent method
		824	my $persistent = exists $arg{persistent} ? !!$arg{persistent} : $idempotent;
		825	my $keepalive = exists $arg{keepalive} ? !!$arg{keepalive} : !$proxy;
		826	my $was_persistent; # true if this is actually a recycled connection
		827
		828	# the key to use in the keepalive cache
		829	my $ka_key = "$uscheme\x00$uhost\x00$uport\x00$arg{sessionid}";
		830
		831	$hdr{connection} = ($persistent ? $keepalive ? "keep-alive, " : "" : "close, ") . "Te"; #1.1
		832	$hdr{te} = "trailers" unless exists $hdr{te}; #1.1
		833
462	my %state = (connect_guard => 1);	834	my %state = (connect_guard => 1);
		835
		836	my $ae_error = 595; # connecting
		837
		838	# handle actual, non-tunneled, request
		839	my $handle_actual_request = sub {
		840	$ae_error = 596; # request phase
		841
		842	my $hdl = $state{handle};
		843
		844	$hdl->starttls ("connect") if $uscheme eq "https" && !exists $hdl->{tls};
		845
		846	# send request
		847	$hdl->push_write (
		848	"$method $rpath HTTP/1.1\015\012"
		849	. (join "", map "\u$_: $hdr{$_}\015\012", grep defined $hdr{$_}, keys %hdr)
		850	. "\015\012"
		851	. $arg{body}
		852	);
		853
		854	# return if error occurred during push_write()
		855	return unless %state;
		856
		857	# reduce memory usage, save a kitten, also re-use it for the response headers.
		858	%hdr = ();
		859
		860	# status line and headers
		861	$state{read_response} = sub {
		862	return unless %state;
		863
		864	for ("$_[1]") {
		865	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
		866
		867	/^HTTP\/0*([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\012]*) )? \012/gxci
		868	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Invalid server response" };
		869
		870	# 100 Continue handling
		871	# should not happen as we don't send expect: 100-continue,
		872	# but we handle it just in case.
		873	# since we send the request body regardless, if we get an error
		874	# we are out of-sync, which we currently do NOT handle correctly.
		875	return $state{handle}->push_read (line => $qr_nlnl, $state{read_response})
		876	if $2 eq 100;
		877
		878	push @pseudo,
		879	HTTPVersion => $1,
		880	Status => $2,
		881	Reason => $3,
		882	;
		883
		884	my $hdr = _parse_hdr
		885	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Garbled response headers" };
		886
		887	%hdr = (%$hdr, @pseudo);
		888	}
		889
		890	# redirect handling
		891	# relative uri handling forced by microsoft and other shitheads.
		892	# we give our best and fall back to URI if available.
		893	if (exists $hdr{location}) {
		894	my $loc = $hdr{location};
		895
		896	if ($loc =~ m%^//%) { # //
		897	$loc = "$rscheme:$loc";
		898
		899	} elsif ($loc eq "") {
		900	$loc = $url;
		901
		902	} elsif ($loc !~ /^(?: $ | [^:\/?\#]+ : )/x) { # anything "simple"
		903	$loc =~ s/^\.\/+//;
		904
		905	if ($loc !~ m%^[.?#]%) {
		906	my $prefix = "$rscheme://$uhost:$uport";
		907
		908	unless ($loc =~ s/^\///) {
		909	$prefix .= $upath;
		910	$prefix =~ s/\/[^\/]*$//;
		911	}
		912
		913	$loc = "$prefix/$loc";
		914
		915	} elsif (eval { require URI }) { # uri
		916	$loc = URI->new_abs ($loc, $url)->as_string;
		917
		918	} else {
		919	return _error %state, $cb, { @pseudo, Status => 599, Reason => "Cannot parse Location (URI module missing)" };
		920	#$hdr{Status} = 599;
		921	#$hdr{Reason} = "Unparsable Redirect (URI module missing)";
		922	#$recurse = 0;
		923	}
		924	}
		925
		926	$hdr{location} = $loc;
		927	}
		928
		929	my $redirect;
		930
		931	if ($recurse) {
		932	my $status = $hdr{Status};
		933
		934	# industry standard is to redirect POST as GET for
		935	# 301, 302 and 303, in contrast to HTTP/1.0 and 1.1.
		936	# also, the UA should ask the user for 301 and 307 and POST,
		937	# industry standard seems to be to simply follow.
		938	# we go with the industry standard. 308 is defined
		939	# by rfc7538
		940	if ($status == 301 or $status == 302 or $status == 303) {
		941	$redirect = 1;
		942	# HTTP/1.1 is unclear on how to mutate the method
		943	unless ($method eq "HEAD") {
		944	$method = "GET";
		945	delete $arg{body};
		946	}
		947	} elsif ($status == 307 or $status == 308) {
		948	$redirect = 1;
		949	}
		950	}
		951
		952	my $finish = sub { # ($data, $err_status, $err_reason[, $persistent])
		953	if ($state{handle}) {
		954	# handle keepalive
		955	if (
		956	$persistent
		957	&& $_[3]
		958	&& ($hdr{HTTPVersion} < 1.1
		959	? $hdr{connection} =~ /\bkeep-?alive\b/i
		960	: $hdr{connection} !~ /\bclose\b/i)
		961	) {
		962	ka_store $ka_key, delete $state{handle};
		963	} else {
		964	# no keepalive, destroy the handle
		965	$state{handle}->destroy;
		966	}
		967	}
		968
		969	%state = ();
		970
		971	if (defined $_[1]) {
		972	$hdr{OrigStatus} = $hdr{Status}; $hdr{Status} = $_[1];
		973	$hdr{OrigReason} = $hdr{Reason}; $hdr{Reason} = $_[2];
		974	}
		975
		976	# set-cookie processing
		977	if ($arg{cookie_jar}) {
		978	cookie_jar_set_cookie $arg{cookie_jar}, $hdr{"set-cookie"}, $uhost, $hdr{date};
		979	}
		980
		981	if ($redirect && exists $hdr{location}) {
		982	# we ignore any errors, as it is very common to receive
		983	# Content-Length != 0 but no actual body
		984	# we also access %hdr, as $_[1] might be an erro
		985	$state{recurse} =
		986	http_request (
		987	$method => $hdr{location},
		988	%arg,
		989	recurse => $recurse - 1,
		990	Redirect => [$_[0], \%hdr],
		991	sub {
		992	%state = ();
		993	&$cb
		994	},
		995	);
		996	} else {
		997	$cb->($_[0], \%hdr);
		998	}
		999	};
		1000
		1001	$ae_error = 597; # body phase
		1002
		1003	my $chunked = $hdr{"transfer-encoding"} =~ /\bchunked\b/i; # not quite correct...
		1004
		1005	my $len = $chunked ? undef : $hdr{"content-length"};
		1006
		1007	# body handling, many different code paths
		1008	# - no body expected
		1009	# - want_body_handle
		1010	# - te chunked
		1011	# - 2x length known (with or without on_body)
		1012	# - 2x length not known (with or without on_body)
		1013	if (!$redirect && $arg{on_header} && !$arg{on_header}(\%hdr)) {
		1014	$finish->(undef, 598 => "Request cancelled by on_header");
		1015	} elsif (
		1016	$hdr{Status} =~ /^(?:1..|204|205|304)$/
		1017	or $method eq "HEAD"
		1018	or (defined $len && $len == 0) # == 0, not !, because "0 " is true
		1019	) {
		1020	# no body
		1021	$finish->("", undef, undef, 1);
		1022
		1023	} elsif (!$redirect && $arg{want_body_handle}) {
		1024	$_[0]->on_eof (undef);
		1025	$_[0]->on_error (undef);
		1026	$_[0]->on_read (undef);
		1027
		1028	$finish->(delete $state{handle});
		1029
		1030	} elsif ($chunked) {
		1031	my $cl = 0;
		1032	my $body = "";
		1033	my $on_body = $arg{on_body} || sub { $body .= shift; 1 };
		1034
		1035	$state{read_chunk} = sub {
		1036	$_[1] =~ /^([0-9a-fA-F]+)/
		1037	or return $finish->(undef, $ae_error => "Garbled chunked transfer encoding");
		1038
		1039	my $len = hex $1;
		1040
		1041	if ($len) {
		1042	$cl += $len;
		1043
		1044	$_[0]->push_read (chunk => $len, sub {
		1045	$on_body->($_[1], \%hdr)
		1046	or return $finish->(undef, 598 => "Request cancelled by on_body");
		1047
		1048	$_[0]->push_read (line => sub {
		1049	length $_[1]
		1050	and return $finish->(undef, $ae_error => "Garbled chunked transfer encoding");
		1051	$_[0]->push_read (line => $state{read_chunk});
		1052	});
		1053	});
		1054	} else {
		1055	$hdr{"content-length"} ||= $cl;
		1056
		1057	$_[0]->push_read (line => $qr_nlnl, sub {
		1058	if (length $_[1]) {
		1059	for ("$_[1]") {
		1060	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
		1061
		1062	my $hdr = _parse_hdr
		1063	or return $finish->(undef, $ae_error => "Garbled response trailers");
		1064
		1065	%hdr = (%hdr, %$hdr);
		1066	}
		1067	}
		1068
		1069	$finish->($body, undef, undef, 1);
		1070	});
		1071	}
		1072	};
		1073
		1074	$_[0]->push_read (line => $state{read_chunk});
		1075
		1076	} elsif ($arg{on_body}) {
		1077	if (defined $len) {
		1078	$_[0]->on_read (sub {
		1079	$len -= length $_[0]{rbuf};
		1080
		1081	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
		1082	or return $finish->(undef, 598 => "Request cancelled by on_body");
		1083
		1084	$len > 0
		1085	or $finish->("", undef, undef, 1);
		1086	});
		1087	} else {
		1088	$_[0]->on_eof (sub {
		1089	$finish->("");
		1090	});
		1091	$_[0]->on_read (sub {
		1092	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
		1093	or $finish->(undef, 598 => "Request cancelled by on_body");
		1094	});
		1095	}
		1096	} else {
		1097	$_[0]->on_eof (undef);
		1098
		1099	if (defined $len) {
		1100	$_[0]->on_read (sub {
		1101	$finish->((substr delete $_[0]{rbuf}, 0, $len, ""), undef, undef, 1)
		1102	if $len <= length $_[0]{rbuf};
		1103	});
		1104	} else {
		1105	$_[0]->on_error (sub {
		1106	($! == Errno::EPIPE || !$!)
		1107	? $finish->(delete $_[0]{rbuf})
		1108	: $finish->(undef, $ae_error => $_[2]);
		1109	});
		1110	$_[0]->on_read (sub { });
		1111	}
		1112	}
		1113	};
		1114
		1115	# if keepalive is enabled, then the server closing the connection
		1116	# before a response can happen legally - we retry on idempotent methods.
		1117	if ($was_persistent && $idempotent) {
		1118	my $old_eof = $hdl->{on_eof};
		1119	$hdl->{on_eof} = sub {
		1120	_destroy_state %state;
		1121
		1122	%state = ();
		1123	$state{recurse} =
		1124	http_request (
		1125	$method => $url,
		1126	%arg,
		1127	recurse => $recurse - 1,
		1128	keepalive => 0,
		1129	sub {
		1130	%state = ();
		1131	&$cb
		1132	}
		1133	);
		1134	};
		1135	$hdl->on_read (sub {
		1136	return unless %state;
		1137
		1138	# as soon as we receive something, a connection close
		1139	# once more becomes a hard error
		1140	$hdl->{on_eof} = $old_eof;
		1141	$hdl->push_read (line => $qr_nlnl, $state{read_response});
		1142	});
		1143	} else {
		1144	$hdl->push_read (line => $qr_nlnl, $state{read_response});
		1145	}
		1146	};
		1147
		1148	my $prepare_handle = sub {
		1149	my ($hdl) = $state{handle};
		1150
		1151	$hdl->on_error (sub {
		1152	_error %state, $cb, { @pseudo, Status => $ae_error, Reason => $_[2] };
		1153	});
		1154	$hdl->on_eof (sub {
		1155	_error %state, $cb, { @pseudo, Status => $ae_error, Reason => "Unexpected end-of-file" };
		1156	});
		1157	$hdl->timeout_reset;
		1158	$hdl->timeout ($timeout);
		1159	};
		1160
		1161	# connected to proxy (or origin server)
		1162	my $connect_cb = sub {
		1163	my $fh = shift
		1164	or return _error %state, $cb, { @pseudo, Status => $ae_error, Reason => "$!" };
		1165
		1166	return unless delete $state{connect_guard};
		1167
		1168	# get handle
		1169	$state{handle} = new AnyEvent::Handle
		1170	%{ $arg{handle_params} },
		1171	fh => $fh,
		1172	peername => $uhost,
		1173	tls_ctx => $arg{tls_ctx},
		1174	;
		1175
		1176	$prepare_handle->();
		1177
		1178	#$state{handle}->starttls ("connect") if $rscheme eq "https";
		1179
		1180	# now handle proxy-CONNECT method
		1181	if ($proxy && $uscheme eq "https") {
		1182	# oh dear, we have to wrap it into a connect request
		1183
		1184	my $auth = exists $hdr{"proxy-authorization"}
		1185	? "proxy-authorization: " . (delete $hdr{"proxy-authorization"}) . "\015\012"
		1186	: "";
		1187
		1188	# maybe re-use $uauthority with patched port?
		1189	$state{handle}->push_write ("CONNECT $uhost:$uport HTTP/1.0\015\012$auth\015\012");
		1190	$state{handle}->push_read (line => $qr_nlnl, sub {
		1191	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix
		1192	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Invalid proxy connect response ($_[1])" };
		1193
		1194	if ($2 == 200) {
		1195	$rpath = $upath;
		1196	$handle_actual_request->();
		1197	} else {
		1198	_error %state, $cb, { @pseudo, Status => $2, Reason => $3 };
		1199	}
		1200	});
		1201	} else {
		1202	delete $hdr{"proxy-authorization"} unless $proxy;
		1203
		1204	$handle_actual_request->();
		1205	}
		1206	};
463		1207
464	_get_slot $uhost, sub {	1208	_get_slot $uhost, sub {
465	$state{slot_guard} = shift;	1209	$state{slot_guard} = shift;
466		1210
467	return unless $state{connect_guard};	1211	return unless $state{connect_guard};
468		1212
		1213	# try to use an existing keepalive connection, but only if we, ourselves, plan
		1214	# on a keepalive request (in theory, this should be a separate config option).
		1215	if ($persistent && $KA_CACHE{$ka_key}) {
		1216	$was_persistent = 1;
		1217
		1218	$state{handle} = ka_fetch $ka_key;
		1219	$state{handle}->destroyed
		1220	and die "AnyEvent::HTTP: unexpectedly got a destructed handle (1), please report.";#d#
		1221	$prepare_handle->();
		1222	$state{handle}->destroyed
		1223	and die "AnyEvent::HTTP: unexpectedly got a destructed handle (2), please report.";#d#
		1224	$handle_actual_request->();
		1225
		1226	} else {
469	my $tcp_connect = $arg{tcp_connect}	1227	my $tcp_connect = $arg{tcp_connect}
470	|| do { require AnyEvent::Socket; \&AnyEvent::Socket::tcp_connect };	1228	|| do { require AnyEvent::Socket; \&AnyEvent::Socket::tcp_connect };
471		1229
472	$state{connect_guard} = $tcp_connect->(	1230	$state{connect_guard} = $tcp_connect->($rhost, $rport, $connect_cb, $arg{on_prepare} || sub { $timeout });
473	$rhost,
474	$rport,
475	sub {
476	$state{fh} = shift
477	or do {
478	my $err = "$!";
479	%state = ();
480	return $cb->(undef, { Status => 599, Reason => $err, @pseudo });
481	};
482
483	pop; # free memory, save a tree
484
485	return unless delete $state{connect_guard};
486
487	# get handle
488	$state{handle} = new AnyEvent::Handle
489	fh => $state{fh},
490	peername => $rhost,
491	tls_ctx => $arg{tls_ctx},
492	# these need to be reconfigured on keepalive handles
493	timeout => $timeout,
494	on_error => sub {
495	%state = ();
496	$cb->(undef, { Status => 599, Reason => $_[2], @pseudo });
497	},
498	on_eof => sub {
499	%state = ();
500	$cb->(undef, { Status => 599, Reason => "Unexpected end-of-file", @pseudo });
501	},
502	;
503
504	# limit the number of persistent connections
505	# keepalive not yet supported
506	# if ($KA_COUNT{$_[1]} < $MAX_PERSISTENT_PER_HOST) {
507	# ++$KA_COUNT{$_[1]};
508	# $state{handle}{ka_count_guard} = AnyEvent::Util::guard {
509	# --$KA_COUNT{$_[1]}
510	# };
511	# $hdr{connection} = "keep-alive";
512	# } else {
513	delete $hdr{connection};
514	# }
515
516	$state{handle}->starttls ("connect") if $rscheme eq "https";
517
518	# handle actual, non-tunneled, request
519	my $handle_actual_request = sub {
520	$state{handle}->starttls ("connect") if $uscheme eq "https" && !exists $state{handle}{tls};
521
522	# send request
523	$state{handle}->push_write (
524	"$method $rpath HTTP/1.0\015\012"
525	. (join "", map "\u$_: $hdr{$_}\015\012", grep defined $hdr{$_}, keys %hdr)
526	. "\015\012"
527	. (delete $arg{body})
528	);
529
530	# return if error occured during push_write()
531	return unless %state;
532
533	%hdr = (); # reduce memory usage, save a kitten, also make it possible to re-use
534
535	# status line and headers
536	$state{handle}->push_read (line => $qr_nlnl, sub {
537	for ("$_[1]") {
538	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
539
540	/^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )? \015?\012/igxc
541	or return (%state = (), $cb->(undef, { Status => 599, Reason => "Invalid server response", @pseudo }));
542
543	push @pseudo,
544	HTTPVersion => $1,
545	Status => $2,
546	Reason => $3,
547	;
548
549	# things seen, not parsed:
550	# p3pP="NON CUR OTPi OUR NOR UNI"
551
552	$hdr{lc $1} .= ",$2"
553	while /\G
554	([^:\000-\037]*):
555	[\011\040]*
556	((?: [^\012]+ | \012[\011\040] )*)
557	\012
558	/gxc;
559
560	/\G$/
561	or return (%state = (), $cb->(undef, { Status => 599, Reason => "Garbled response headers", @pseudo }));
562	}
563
564	# remove the "," prefix we added to all headers above
565	substr $_, 0, 1, ""
566	for values %hdr;
567
568	# patch in all pseudo headers
569	%hdr = (%hdr, @pseudo);
570
571	# redirect handling
572	# microsoft and other shitheads don't give a shit for following standards,
573	# try to support some common forms of broken Location headers.
574	if ($hdr{location} !~ /^(?: $ | [^:\/?\#]+ : )/x) {
575	$hdr{location} =~ s/^\.\/+//;
576
577	my $url = "$rscheme://$uhost:$uport";
578
579	unless ($hdr{location} =~ s/^\///) {
580	$url .= $upath;
581	$url =~ s/\/[^\/]*$//;
582	}
583
584	$hdr{location} = "$url/$hdr{location}";
585	}
586
587	my $redirect;
588
589	if ($recurse) {
590	my $status = $hdr{Status};
591
592	# industry standard is to redirect POST as GET for
593	# 301, 302 and 303, in contrast to http/1.0 and 1.1.
594	# also, the UA should ask the user for 301 and 307 and POST,
595	# industry standard seems to be to simply follow.
596	# we go with the industry standard.
597	if ($status == 301 or $status == 302 or $status == 303) {
598	# HTTP/1.1 is unclear on how to mutate the method
599	$method = "GET" unless $method eq "HEAD";
600	$redirect = 1;
601	} elsif ($status == 307) {
602	$redirect = 1;
603	}
604	}
605
606	my $finish = sub {
607	$state{handle}->destroy if $state{handle};
608	%state = ();
609
610	# set-cookie processing
611	if ($arg{cookie_jar}) {
612	for ($_[1]{"set-cookie"}) {
613	# parse NAME=VALUE
614	my @kv;
615
616	while (/\G\s* ([^=;,[:space:]]+) \s*=\s* (?: "((?:[^\\"]+|\\.)*)" | ([^=;,[:space:]]*) )/gcxs) {
617	my $name = $1;
618	my $value = $3;
619
620	unless ($value) {
621	$value = $2;
622	$value =~ s/\\(.)/$1/gs;
623	}
624
625	push @kv, $name => $value;
626
627	last unless /\G\s*;/gc;
628	}
629
630	last unless @kv;
631
632	my $name = shift @kv;
633	my %kv = (value => shift @kv, @kv);
634
635	my $cdom;
636	my $cpath = (delete $kv{path}) || "/";
637
638	if (exists $kv{domain}) {
639	$cdom = delete $kv{domain};
640		1231	}
641	$cdom =~ s/^\.?/./; # make sure it starts with a "."
642
643	next if $cdom =~ /\.$/;
644
645	# this is not rfc-like and not netscape-like. go figure.
646	my $ndots = $cdom =~ y/.//;
647	next if $ndots < ($cdom =~ /\.[^.][^.]\.[^.][^.]$/ ? 3 : 2);
648	} else {
649	$cdom = $uhost;
650	}
651
652	# store it
653	$arg{cookie_jar}{version} = 1;
654	$arg{cookie_jar}{$cdom}{$cpath}{$name} = \%kv;
655
656	redo if /\G\s*,/gc;
657	}
658	}
659
660	if ($redirect && exists $hdr{location}) {
661	# we ignore any errors, as it is very common to receive
662	# Content-Length != 0 but no actual body
663	# we also access %hdr, as $_[1] might be an erro
664	http_request (
665	$method => $hdr{location},
666	%arg,
667	recurse => $recurse - 1,
668	Redirect => \@_,
669	$cb);
670	} else {
671	$cb->($_[0], $_[1]);
672	}
673	};
674
675	my $len = $hdr{"content-length"};
676
677	if (!$redirect && $arg{on_header} && !$arg{on_header}(\%hdr)) {
678	$finish->(undef, { Status => 598, Reason => "Request cancelled by on_header", @pseudo });
679	} elsif (
680	$hdr{Status} =~ /^(?:1..|[23]04)$/
681	or $method eq "HEAD"
682	or (defined $len && !$len)
683	) {
684	# no body
685	$finish->("", \%hdr);
686	} else {
687	# body handling, four different code paths
688	# for want_body_handle, on_body (2x), normal (2x)
689	# we might read too much here, but it does not matter yet (no pers. connections)
690	if (!$redirect && $arg{want_body_handle}) {
691	$_[0]->on_eof (undef);
692	$_[0]->on_error (undef);
693	$_[0]->on_read (undef);
694
695	$finish->(delete $state{handle}, \%hdr);
696
697	} elsif ($arg{on_body}) {
698	$_[0]->on_error (sub { $finish->(undef, { Status => 599, Reason => $_[2], @pseudo }) });
699	if ($len) {
700	$_[0]->on_eof (undef);
701	$_[0]->on_read (sub {
702	$len -= length $_[0]{rbuf};
703
704	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
705	or $finish->(undef, { Status => 598, Reason => "Request cancelled by on_body", @pseudo });
706
707	$len > 0
708	or $finish->("", \%hdr);
709	});
710	} else {
711	$_[0]->on_eof (sub {
712	$finish->("", \%hdr);
713	});
714	$_[0]->on_read (sub {
715	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
716	or $finish->(undef, { Status => 598, Reason => "Request cancelled by on_body", @pseudo });
717	});
718	}
719	} else {
720	$_[0]->on_eof (undef);
721
722	if ($len) {
723	$_[0]->on_error (sub { $finish->(undef, { Status => 599, Reason => $_[2], @pseudo }) });
724	$_[0]->on_read (sub {
725	$finish->((substr delete $_[0]{rbuf}, 0, $len, ""), \%hdr)
726	if $len <= length $_[0]{rbuf};
727	});
728	} else {
729	$_[0]->on_error (sub {
730	($! == Errno::EPIPE || !$!)
731	? $finish->(delete $_[0]{rbuf}, \%hdr)
732	: $finish->(undef, { Status => 599, Reason => $_[2], @pseudo });
733	});
734	$_[0]->on_read (sub { });
735	}
736	}
737	}
738	});
739	};
740
741	# now handle proxy-CONNECT method
742	if ($proxy && $uscheme eq "https") {
743	# oh dear, we have to wrap it into a connect request
744
745	# maybe re-use $uauthority with patched port?
746	$state{handle}->push_write ("CONNECT $uhost:$uport HTTP/1.0\015\012Host: $uhost\015\012\015\012");
747	$state{handle}->push_read (line => $qr_nlnl, sub {
748	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix
749	or return (%state = (), $cb->(undef, { Status => 599, Reason => "Invalid proxy connect response ($_[1])", @pseudo }));
750
751	if ($2 == 200) {
752	$rpath = $upath;
753	&$handle_actual_request;
754	} else {
755	%state = ();
756	$cb->(undef, { Status => $2, Reason => $3, @pseudo });
757	}
758	});
759	} else {
760	&$handle_actual_request;
761	}
762
763	},
764	$arg{on_prepare} || sub { $timeout }
765	);
766	};	1232	};
767		1233
768	defined wantarray && AnyEvent::Util::guard { %state = () }	1234	defined wantarray && AnyEvent::Util::guard { _destroy_state %state }
769	}	1235	}
770		1236
771	sub http_get($@) {	1237	sub http_get($@) {
772	unshift @_, "GET";	1238	unshift @_, "GET";
773	&http_request	1239	&http_request
…		…
791	AnyEvent::HTTP uses the AnyEvent::Socket::tcp_connect function for	1257	AnyEvent::HTTP uses the AnyEvent::Socket::tcp_connect function for
792	the actual connection, which in turn uses AnyEvent::DNS to resolve	1258	the actual connection, which in turn uses AnyEvent::DNS to resolve
793	hostnames. The latter is a simple stub resolver and does no caching	1259	hostnames. The latter is a simple stub resolver and does no caching
794	on its own. If you want DNS caching, you currently have to provide	1260	on its own. If you want DNS caching, you currently have to provide
795	your own default resolver (by storing a suitable resolver object in	1261	your own default resolver (by storing a suitable resolver object in
796	C<$AnyEvent::DNS::RESOLVER>).	1262	C<$AnyEvent::DNS::RESOLVER>) or your own C<tcp_connect> callback.
797		1263
798	=head2 GLOBAL FUNCTIONS AND VARIABLES	1264	=head2 GLOBAL FUNCTIONS AND VARIABLES
799		1265
800	=over 4	1266	=over 4
801		1267
802	=item AnyEvent::HTTP::set_proxy "proxy-url"	1268	=item AnyEvent::HTTP::set_proxy "proxy-url"
803		1269
804	Sets the default proxy server to use. The proxy-url must begin with a	1270	Sets the default proxy server to use. The proxy-url must begin with a
805	string of the form C<http://host:port> (optionally C<https:...>), croaks	1271	string of the form C<http://host:port>, croaks otherwise.
806	otherwise.
807		1272
808	To clear an already-set proxy, use C<undef>.	1273	To clear an already-set proxy, use C<undef>.
809		1274
		1275	When AnyEvent::HTTP is loaded for the first time it will query the
		1276	default proxy from the operating system, currently by looking at
		1277	C<$ENV{http_proxy>}.
		1278
		1279	=item AnyEvent::HTTP::cookie_jar_expire $jar[, $session_end]
		1280
		1281	Remove all cookies from the cookie jar that have been expired. If
		1282	C<$session_end> is given and true, then additionally remove all session
		1283	cookies.
		1284
		1285	You should call this function (with a true C<$session_end>) before you
		1286	save cookies to disk, and you should call this function after loading them
		1287	again. If you have a long-running program you can additionally call this
		1288	function from time to time.
		1289
		1290	A cookie jar is initially an empty hash-reference that is managed by this
		1291	module. Its format is subject to change, but currently it is as follows:
		1292
		1293	The key C<version> has to contain C<1>, otherwise the hash gets
		1294	emptied. All other keys are hostnames or IP addresses pointing to
		1295	hash-references. The key for these inner hash references is the
		1296	server path for which this cookie is meant, and the values are again
		1297	hash-references. Each key of those hash-references is a cookie name, and
		1298	the value, you guessed it, is another hash-reference, this time with the
		1299	key-value pairs from the cookie, except for C<expires> and C<max-age>,
		1300	which have been replaced by a C<_expires> key that contains the cookie
		1301	expiry timestamp. Session cookies are indicated by not having an
		1302	C<_expires> key.
		1303
		1304	Here is an example of a cookie jar with a single cookie, so you have a
		1305	chance of understanding the above paragraph:
		1306
		1307	{
		1308	version => 1,
		1309	"10.0.0.1" => {
		1310	"/" => {
		1311	"mythweb_id" => {
		1312	_expires => 1293917923,
		1313	value => "ooRung9dThee3ooyXooM1Ohm",
		1314	},
		1315	},
		1316	},
		1317	}
		1318
		1319	=item $date = AnyEvent::HTTP::format_date $timestamp
		1320
		1321	Takes a POSIX timestamp (seconds since the epoch) and formats it as a HTTP
		1322	Date (RFC 2616).
		1323
		1324	=item $timestamp = AnyEvent::HTTP::parse_date $date
		1325
		1326	Takes a HTTP Date (RFC 2616) or a Cookie date (netscape cookie spec) or a
		1327	bunch of minor variations of those, and returns the corresponding POSIX
		1328	timestamp, or C<undef> if the date cannot be parsed.
		1329
810	=item $AnyEvent::HTTP::MAX_RECURSE	1330	=item $AnyEvent::HTTP::MAX_RECURSE
811		1331
812	The default value for the C<recurse> request parameter (default: C<10>).	1332	The default value for the C<recurse> request parameter (default: C<10>).
		1333
		1334	=item $AnyEvent::HTTP::TIMEOUT
		1335
		1336	The default timeout for connection operations (default: C<300>).
813		1337
814	=item $AnyEvent::HTTP::USERAGENT	1338	=item $AnyEvent::HTTP::USERAGENT
815		1339
816	The default value for the C<User-Agent> header (the default is	1340	The default value for the C<User-Agent> header (the default is
817	C<Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>).	1341	C<Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>).
818		1342
819	=item $AnyEvent::HTTP::MAX_PER_HOST	1343	=item $AnyEvent::HTTP::MAX_PER_HOST
820		1344
821	The maximum number of concurrent connections to the same host (identified	1345	The maximum number of concurrent connections to the same host (identified
822	by the hostname). If the limit is exceeded, then the additional requests	1346	by the hostname). If the limit is exceeded, then additional requests
823	are queued until previous connections are closed.	1347	are queued until previous connections are closed. Both persistent and
		1348	non-persistent connections are counted in this limit.
824		1349
825	The default value for this is C<4>, and it is highly advisable to not	1350	The default value for this is C<4>, and it is highly advisable to not
826	increase it.	1351	increase it much.
		1352
		1353	For comparison: the RFC's recommend 4 non-persistent or 2 persistent
		1354	connections, older browsers used 2, newer ones (such as firefox 3)
		1355	typically use 6, and Opera uses 8 because like, they have the fastest
		1356	browser and give a shit for everybody else on the planet.
		1357
		1358	=item $AnyEvent::HTTP::PERSISTENT_TIMEOUT
		1359
		1360	The time after which idle persistent connections get closed by
		1361	AnyEvent::HTTP (default: C<3>).
827		1362
828	=item $AnyEvent::HTTP::ACTIVE	1363	=item $AnyEvent::HTTP::ACTIVE
829		1364
830	The number of active connections. This is not the number of currently	1365	The number of active connections. This is not the number of currently
831	running requests, but the number of currently open and non-idle TCP	1366	running requests, but the number of currently open and non-idle TCP
832	connections. This number of can be useful for load-leveling.	1367	connections. This number can be useful for load-leveling.
833		1368
834	=back	1369	=back
835		1370
836	=cut	1371	=cut
		1372
		1373	our @month = qw(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec);
		1374	our @weekday = qw(Sun Mon Tue Wed Thu Fri Sat);
		1375
		1376	sub format_date($) {
		1377	my ($time) = @_;
		1378
		1379	# RFC 822/1123 format
		1380	my ($S, $M, $H, $mday, $mon, $year, $wday, $yday, undef) = gmtime $time;
		1381
		1382	sprintf "%s, %02d %s %04d %02d:%02d:%02d GMT",
		1383	$weekday[$wday], $mday, $month[$mon], $year + 1900,
		1384	$H, $M, $S;
		1385	}
		1386
		1387	sub parse_date($) {
		1388	my ($date) = @_;
		1389
		1390	my ($d, $m, $y, $H, $M, $S);
		1391
		1392	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$/) {
		1393	# RFC 822/1123, required by RFC 2616 (with " ")
		1394	# cookie dates (with "-")
		1395
		1396	($d, $m, $y, $H, $M, $S) = ($1, $2, $3, $4, $5, $6);
		1397
		1398	} 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$/) {
		1399	# RFC 850
		1400	($d, $m, $y, $H, $M, $S) = ($1, $2, $3 < 69 ? $3 + 2000 : $3 + 1900, $4, $5, $6);
		1401
		1402	} 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])$/) {
		1403	# ISO C's asctime
		1404	($d, $m, $y, $H, $M, $S) = ($2, $1, $6, $3, $4, $5);
		1405	}
		1406	# other formats fail in the loop below
		1407
		1408	for (0..11) {
		1409	if ($m eq $month[$_]) {
		1410	require Time::Local;
		1411	return eval { Time::Local::timegm ($S, $M, $H, $d, $_, $y) };
		1412	}
		1413	}
		1414
		1415	undef
		1416	}
837		1417
838	sub set_proxy($) {	1418	sub set_proxy($) {
839	if (length $_[0]) {	1419	if (length $_[0]) {
840	$_[0] =~ m%^(https?):// ([^:/]+) (?: : (\d*) )?%ix	1420	$_[0] =~ m%^(http):// ([^:/]+) (?: : (\d*) )?%ix
841	or Carp::croak "$_[0]: invalid proxy URL";	1421	or Carp::croak "$_[0]: invalid proxy URL";
842	$PROXY = [$2, $3 || 3128, $1]	1422	$PROXY = [$2, $3 || 3128, $1]
843	} else {	1423	} else {
844	undef $PROXY;	1424	undef $PROXY;
845	}	1425	}
…		…
848	# initialise proxy from environment	1428	# initialise proxy from environment
849	eval {	1429	eval {
850	set_proxy $ENV{http_proxy};	1430	set_proxy $ENV{http_proxy};
851	};	1431	};
852		1432
		1433	=head2 SHOWCASE
		1434
		1435	This section contains some more elaborate "real-world" examples or code
		1436	snippets.
		1437
		1438	=head2 HTTP/1.1 FILE DOWNLOAD
		1439
		1440	Downloading files with HTTP can be quite tricky, especially when something
		1441	goes wrong and you want to resume.
		1442
		1443	Here is a function that initiates and resumes a download. It uses the
		1444	last modified time to check for file content changes, and works with many
		1445	HTTP/1.0 servers as well, and usually falls back to a complete re-download
		1446	on older servers.
		1447
		1448	It calls the completion callback with either C<undef>, which means a
		1449	nonretryable error occurred, C<0> when the download was partial and should
		1450	be retried, and C<1> if it was successful.
		1451
		1452	use AnyEvent::HTTP;
		1453
		1454	sub download($$$) {
		1455	my ($url, $file, $cb) = @_;
		1456
		1457	open my $fh, "+<", $file
		1458	or die "$file: $!";
		1459
		1460	my %hdr;
		1461	my $ofs = 0;
		1462
		1463	warn stat $fh;
		1464	warn -s _;
		1465	if (stat $fh and -s _) {
		1466	$ofs = -s _;
		1467	warn "-s is ", $ofs;
		1468	$hdr{"if-unmodified-since"} = AnyEvent::HTTP::format_date +(stat _)[9];
		1469	$hdr{"range"} = "bytes=$ofs-";
		1470	}
		1471
		1472	http_get $url,
		1473	headers => \%hdr,
		1474	on_header => sub {
		1475	my ($hdr) = @_;
		1476
		1477	if ($hdr->{Status} == 200 && $ofs) {
		1478	# resume failed
		1479	truncate $fh, $ofs = 0;
		1480	}
		1481
		1482	sysseek $fh, $ofs, 0;
		1483
		1484	1
		1485	},
		1486	on_body => sub {
		1487	my ($data, $hdr) = @_;
		1488
		1489	if ($hdr->{Status} =~ /^2/) {
		1490	length $data == syswrite $fh, $data
		1491	or return; # abort on write errors
		1492	}
		1493
		1494	1
		1495	},
		1496	sub {
		1497	my (undef, $hdr) = @_;
		1498
		1499	my $status = $hdr->{Status};
		1500
		1501	if (my $time = AnyEvent::HTTP::parse_date $hdr->{"last-modified"}) {
		1502	utime $fh, $time, $time;
		1503	}
		1504
		1505	if ($status == 200 || $status == 206 || $status == 416) {
		1506	# download ok || resume ok || file already fully downloaded
		1507	$cb->(1, $hdr);
		1508
		1509	} elsif ($status == 412) {
		1510	# file has changed while resuming, delete and retry
		1511	unlink $file;
		1512	$cb->(0, $hdr);
		1513
		1514	} elsif ($status == 500 or $status == 503 or $status =~ /^59/) {
		1515	# retry later
		1516	$cb->(0, $hdr);
		1517
		1518	} else {
		1519	$cb->(undef, $hdr);
		1520	}
		1521	}
		1522	;
		1523	}
		1524
		1525	download "http://server/somelargefile", "/tmp/somelargefile", sub {
		1526	if ($_[0]) {
		1527	print "OK!\n";
		1528	} elsif (defined $_[0]) {
		1529	print "please retry later\n";
		1530	} else {
		1531	print "ERROR\n";
		1532	}
		1533	};
		1534
		1535	=head3 SOCKS PROXIES
		1536
		1537	Socks proxies are not directly supported by AnyEvent::HTTP. You can
		1538	compile your perl to support socks, or use an external program such as
		1539	F<socksify> (dante) or F<tsocks> to make your program use a socks proxy
		1540	transparently.
		1541
		1542	Alternatively, for AnyEvent::HTTP only, you can use your own
		1543	C<tcp_connect> function that does the proxy handshake - here is an example
		1544	that works with socks4a proxies:
		1545
		1546	use Errno;
		1547	use AnyEvent::Util;
		1548	use AnyEvent::Socket;
		1549	use AnyEvent::Handle;
		1550
		1551	# host, port and username of/for your socks4a proxy
		1552	my $socks_host = "10.0.0.23";
		1553	my $socks_port = 9050;
		1554	my $socks_user = "";
		1555
		1556	sub socks4a_connect {
		1557	my ($host, $port, $connect_cb, $prepare_cb) = @_;
		1558
		1559	my $hdl = new AnyEvent::Handle
		1560	connect => [$socks_host, $socks_port],
		1561	on_prepare => sub { $prepare_cb->($_[0]{fh}) },
		1562	on_error => sub { $connect_cb->() },
		1563	;
		1564
		1565	$hdl->push_write (pack "CCnNZ*Z*", 4, 1, $port, 1, $socks_user, $host);
		1566
		1567	$hdl->push_read (chunk => 8, sub {
		1568	my ($hdl, $chunk) = @_;
		1569	my ($status, $port, $ipn) = unpack "xCna4", $chunk;
		1570
		1571	if ($status == 0x5a) {
		1572	$connect_cb->($hdl->{fh}, (format_address $ipn) . ":$port");
		1573	} else {
		1574	$! = Errno::ENXIO; $connect_cb->();
		1575	}
		1576	});
		1577
		1578	$hdl
		1579	}
		1580
		1581	Use C<socks4a_connect> instead of C<tcp_connect> when doing C<http_request>s,
		1582	possibly after switching off other proxy types:
		1583
		1584	AnyEvent::HTTP::set_proxy undef; # usually you do not want other proxies
		1585
		1586	http_get 'http://www.google.com', tcp_connect => \&socks4a_connect, sub {
		1587	my ($data, $headers) = @_;
		1588	...
		1589	};
		1590
853	=head1 SEE ALSO	1591	=head1 SEE ALSO
854		1592
855	L<AnyEvent>.	1593	L<AnyEvent>.
856		1594
857	=head1 AUTHOR	1595	=head1 AUTHOR

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