ViewVC Help

View File | Revision Log | Show Annotations | Download File

/cvs/AnyEvent-HTTP/HTTP.pm

Comparing AnyEvent-HTTP/HTTP.pm (file contents):
Revision 1.65 by root, Fri Dec 31 03:47:32 2010 UTC vs.
Revision 1.131 by root, Thu Aug 30 17:04:28 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 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. If an error occurs	100	three parts of the HTTP Status-Line of the same name. If an error occurs
…		…
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	169	The request headers to use. Currently, C<http_request> may provide its own
156	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
157	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:>
158	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
159	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.
160		181
161	=item timeout => $seconds	182	=item timeout => $seconds
162		183
163	The time-out to use for various stages - each connect attempt will reset	184	The time-out to use for various stages - each connect attempt will reset
164	the timeout, as will read or write activity, i.e. this is not an overall	185	the timeout, as will read or write activity, i.e. this is not an overall
…		…
166		187
167	Default timeout is 5 minutes.	188	Default timeout is 5 minutes.
168		189
169	=item proxy => [$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).
181		207
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 expiry times are currently being ignored.	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 of very high quality, nor	220	Note that this cookie implementation is not meant to be complete. If
193	meant to be complete. If you want complete cookie management you have to	221	you want complete cookie management you have to do that on your
194	do that on your own. C<cookie_jar> is meant as a quick fix to get some	222	own. C<cookie_jar> is meant as a quick fix to get most cookie-using sites
195	cookie-using sites working. Cookies are a privacy disaster, do not use	223	working. Cookies are a privacy disaster, do not use them unless required
196	them unless required to.	224	to.
		225
		226	When cookie processing is enabled, the C<Cookie:> and C<Set-Cookie:>
		227	headers will be set and handled by this module, otherwise they will be
		228	left untouched.
197		229
198	=item tls_ctx => $scheme | $tls_ctx	230	=item tls_ctx => $scheme | $tls_ctx
199		231
200	Specifies the AnyEvent::TLS context to be used for https connections. This	232	Specifies the AnyEvent::TLS context to be used for https connections. This
201	parameter follows the same rules as the C<tls_ctx> parameter to	233	parameter follows the same rules as the C<tls_ctx> parameter to
…		…
205	verification) TLS context.	237	verification) TLS context.
206		238
207	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
208	me the page, no matter what".	240	me the page, no matter what".
209		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
210	=item on_prepare => $callback->($fh)	252	=item on_prepare => $callback->($fh)
211		253
212	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
213	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
214	overrides the prepare callback passed to C<AnyEvent::Socket::tcp_connect>	256	overrides the prepare callback passed to C<AnyEvent::Socket::tcp_connect>
215	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
216	timeout). See the description for the C<$prepare_cb> argument of	258	timeout). See the description for the C<$prepare_cb> argument of
217	C<AnyEvent::Socket::tcp_connect> for details.	259	C<AnyEvent::Socket::tcp_connect> for details.
218		260
…		…
240		282
241	This callback is useful, among other things, to quickly reject unwanted	283	This callback is useful, among other things, to quickly reject unwanted
242	content, which, if it is supposed to be rare, can be faster than first	284	content, which, if it is supposed to be rare, can be faster than first
243	doing a C<HEAD> request.	285	doing a C<HEAD> request.
244		286
		287	The downside is that cancelling the request makes it impossible to re-use
		288	the connection. Also, the C<on_header> callback will not receive any
		289	trailer (headers sent after the response body).
		290
245	Example: cancel the request unless the content-type is "text/html".	291	Example: cancel the request unless the content-type is "text/html".
246		292
247	on_header => sub {	293	on_header => sub {
248	$_[0]{"content-type"} =~ /^text\/html\s*(?:;|$)/	294	$_[0]{"content-type"} =~ /^text\/html\s*(?:;|$)/
249	},	295	},
…		…
255	string instead of the body data.	301	string instead of the body data.
256		302
257	It has to return either true (in which case AnyEvent::HTTP will continue),	303	It has to return either true (in which case AnyEvent::HTTP will continue),
258	or false, in which case AnyEvent::HTTP will cancel the download (and call	304	or false, in which case AnyEvent::HTTP will cancel the download (and call
259	the completion callback with an error code of C<598>).	305	the completion callback with an error code of C<598>).
		306
		307	The downside to cancelling the request is that it makes it impossible to
		308	re-use the connection.
260		309
261	This callback is useful when the data is too large to be held in memory	310	This callback is useful when the data is too large to be held in memory
262	(so the callback writes it to a file) or when only some information should	311	(so the callback writes it to a file) or when only some information should
263	be extracted, or when the body should be processed incrementally.	312	be extracted, or when the body should be processed incrementally.
264		313
…		…
276	called. Instead of the C<$body> argument containing the body data, the	325	called. Instead of the C<$body> argument containing the body data, the
277	callback will receive the L<AnyEvent::Handle> object associated with the	326	callback will receive the L<AnyEvent::Handle> object associated with the
278	connection. In error cases, C<undef> will be passed. When there is no body	327	connection. In error cases, C<undef> will be passed. When there is no body
279	(e.g. status C<304>), the empty string will be passed.	328	(e.g. status C<304>), the empty string will be passed.
280		329
281	The handle object might or might not be in TLS mode, might be connected to	330	The handle object might or might not be in TLS mode, might be connected
282	a proxy, be a persistent connection etc., and configured in unspecified	331	to a proxy, be a persistent connection, use chunked transfer encoding
283	ways. The user is responsible for this handle (it will not be used by this	332	etc., and configured in unspecified ways. The user is responsible for this
284	module anymore).	333	handle (it will not be used by this module anymore).
285		334
286	This is useful with some push-type services, where, after the initial	335	This is useful with some push-type services, where, after the initial
287	headers, an interactive protocol is used (typical example would be the	336	headers, an interactive protocol is used (typical example would be the
288	push-style twitter API which starts a JSON/XML stream).	337	push-style twitter API which starts a JSON/XML stream).
289		338
290	If you think you need this, first have a look at C<on_body>, to see if	339	If you think you need this, first have a look at C<on_body>, to see if
291	that doesn't solve your problem in a better way.	340	that doesn't solve your problem in a better way.
292		341
		342	=item persistent => $boolean
		343
		344	Try to create/reuse a persistent connection. When this flag is set
		345	(default: true for idempotent requests, false for all others), then
		346	C<http_request> tries to re-use an existing (previously-created)
		347	persistent connection to the host and, failing that, tries to create a new
		348	one.
		349
		350	Requests failing in certain ways will be automatically retried once, which
		351	is dangerous for non-idempotent requests, which is why it defaults to off
		352	for them. The reason for this is because the bozos who designed HTTP/1.1
		353	made it impossible to distinguish between a fatal error and a normal
		354	connection timeout, so you never know whether there was a problem with
		355	your request or not.
		356
		357	When reusing an existent connection, many parameters (such as TLS context)
		358	will be ignored. See the C<session> parameter for a workaround.
		359
		360	=item keepalive => $boolean
		361
		362	Only used when C<persistent> is also true. This parameter decides whether
		363	C<http_request> tries to handshake a HTTP/1.0-style keep-alive connection
		364	(as opposed to only a HTTP/1.1 persistent connection).
		365
		366	The default is true, except when using a proxy, in which case it defaults
		367	to false, as HTTP/1.0 proxies cannot support this in a meaningful way.
		368
		369	=item handle_params => { key => value ... }
		370
		371	The key-value pairs in this hash will be passed to any L<AnyEvent::Handle>
		372	constructor that is called - not all requests will create a handle, and
		373	sometimes more than one is created, so this parameter is only good for
		374	setting hints.
		375
		376	Example: set the maximum read size to 4096, to potentially conserve memory
		377	at the cost of speed.
		378
		379	handle_params => {
		380	max_read_size => 4096,
		381	},
		382
293	=back	383	=back
294		384
295	Example: make a simple HTTP GET request for http://www.nethype.de/	385	Example: do a simple HTTP GET request for http://www.nethype.de/ and print
		386	the response body.
296		387
297	http_request GET => "http://www.nethype.de/", sub {	388	http_request GET => "http://www.nethype.de/", sub {
298	my ($body, $hdr) = @_;	389	my ($body, $hdr) = @_;
299	print "$body\n";	390	print "$body\n";
300	};	391	};
301		392
302	Example: make a HTTP HEAD request on https://www.google.com/, use a	393	Example: do a HTTP HEAD request on https://www.google.com/, use a
303	timeout of 30 seconds.	394	timeout of 30 seconds.
304		395
305	http_request	396	http_request
306	GET => "https://www.google.com",	397	HEAD => "https://www.google.com",
		398	headers => { "user-agent" => "MySearchClient 1.0" },
307	timeout => 30,	399	timeout => 30,
308	sub {	400	sub {
309	my ($body, $hdr) = @_;	401	my ($body, $hdr) = @_;
310	use Data::Dumper;	402	use Data::Dumper;
311	print Dumper $hdr;	403	print Dumper $hdr;
312	}	404	}
313	;	405	;
314		406
315	Example: make another simple HTTP GET request, but immediately try to	407	Example: do another simple HTTP GET request, but immediately try to
316	cancel it.	408	cancel it.
317		409
318	my $request = http_request GET => "http://www.nethype.de/", sub {	410	my $request = http_request GET => "http://www.nethype.de/", sub {
319	my ($body, $hdr) = @_;	411	my ($body, $hdr) = @_;
320	print "$body\n";	412	print "$body\n";
321	};	413	};
322		414
323	undef $request;	415	undef $request;
324		416
325	=cut	417	=cut
		418
		419	#############################################################################
		420	# wait queue/slots
326		421
327	sub _slot_schedule;	422	sub _slot_schedule;
328	sub _slot_schedule($) {	423	sub _slot_schedule($) {
329	my $host = shift;	424	my $host = shift;
330		425
…		…
352	push @{ $CO_SLOT{$_[0]}[1] }, $_[1];	447	push @{ $CO_SLOT{$_[0]}[1] }, $_[1];
353		448
354	_slot_schedule $_[0];	449	_slot_schedule $_[0];
355	}	450	}
356		451
		452	#############################################################################
		453	# cookie handling
		454
		455	# expire cookies
		456	sub cookie_jar_expire($;$) {
		457	my ($jar, $session_end) = @_;
		458
		459	%$jar = () if $jar->{version} != 2;
		460
		461	my $anow = AE::now;
		462
		463	while (my ($chost, $paths) = each %$jar) {
		464	next unless ref $paths;
		465
		466	while (my ($cpath, $cookies) = each %$paths) {
		467	while (my ($cookie, $kv) = each %$cookies) {
		468	if (exists $kv->{_expires}) {
		469	delete $cookies->{$cookie}
		470	if $anow > $kv->{_expires};
		471	} elsif ($session_end) {
		472	delete $cookies->{$cookie};
		473	}
		474	}
		475
		476	delete $paths->{$cpath}
		477	unless %$cookies;
		478	}
		479
		480	delete $jar->{$chost}
		481	unless %$paths;
		482	}
		483	}
		484
		485	# extract cookies from jar
		486	sub cookie_jar_extract($$$$) {
		487	my ($jar, $scheme, $host, $path) = @_;
		488
		489	%$jar = () if $jar->{version} != 2;
		490
		491	$host = AnyEvent::Util::idn_to_ascii $host
		492	if $host =~ /[^\x00-\x7f]/;
		493
		494	my @cookies;
		495
		496	while (my ($chost, $paths) = each %$jar) {
		497	next unless ref $paths;
		498
		499	# exact match or suffix including . match
		500	$chost eq $host or ".$chost" eq substr $host, -1 - length $chost
		501	or next;
		502
		503	while (my ($cpath, $cookies) = each %$paths) {
		504	next unless $cpath eq substr $path, 0, length $cpath;
		505
		506	while (my ($cookie, $kv) = each %$cookies) {
		507	next if $scheme ne "https" && exists $kv->{secure};
		508
		509	if (exists $kv->{_expires} and AE::now > $kv->{_expires}) {
		510	delete $cookies->{$cookie};
		511	next;
		512	}
		513
		514	my $value = $kv->{value};
		515
		516	if ($value =~ /[=;,[:space:]]/) {
		517	$value =~ s/([\\"])/\\$1/g;
		518	$value = "\"$value\"";
		519	}
		520
		521	push @cookies, "$cookie=$value";
		522	}
		523	}
		524	}
		525
		526	\@cookies
		527	}
		528
		529	# parse set_cookie header into jar
		530	sub cookie_jar_set_cookie($$$$) {
		531	my ($jar, $set_cookie, $host, $date) = @_;
		532
		533	%$jar = () if $jar->{version} != 2;
		534
		535	my $anow = int AE::now;
		536	my $snow; # server-now
		537
		538	for ($set_cookie) {
		539	# parse NAME=VALUE
		540	my @kv;
		541
		542	# expires is not http-compliant in the original cookie-spec,
		543	# we support the official date format and some extensions
		544	while (
		545	m{
		546	\G\s*
		547	(?:
		548	expires \s*=\s* ([A-Z][a-z][a-z]+,\ [^,;]+)
		549	| ([^=;,[:space:]]+) (?: \s*=\s* (?: "((?:[^\\"]+|\\.)*)" | ([^;,[:space:]]*) ) )?
		550	)
		551	}gcxsi
		552	) {
		553	my $name = $2;
		554	my $value = $4;
		555
		556	if (defined $1) {
		557	# expires
		558	$name = "expires";
		559	$value = $1;
		560	} elsif (defined $3) {
		561	# quoted
		562	$value = $3;
		563	$value =~ s/\\(.)/$1/gs;
		564	}
		565
		566	push @kv, @kv ? lc $name : $name, $value;
		567
		568	last unless /\G\s*;/gc;
		569	}
		570
		571	last unless @kv;
		572
		573	my $name = shift @kv;
		574	my %kv = (value => shift @kv, @kv);
		575
		576	if (exists $kv{"max-age"}) {
		577	$kv{_expires} = $anow + delete $kv{"max-age"};
		578	} elsif (exists $kv{expires}) {
		579	$snow ||= parse_date ($date) || $anow;
		580	$kv{_expires} = $anow + (parse_date (delete $kv{expires}) - $snow);
		581	} else {
		582	delete $kv{_expires};
		583	}
		584
		585	my $cdom;
		586	my $cpath = (delete $kv{path}) || "/";
		587
		588	if (exists $kv{domain}) {
		589	$cdom = $kv{domain};
		590
		591	$cdom =~ s/^\.?/./; # make sure it starts with a "."
		592
		593	next if $cdom =~ /\.$/;
		594
		595	# this is not rfc-like and not netscape-like. go figure.
		596	my $ndots = $cdom =~ y/.//;
		597	next if $ndots < ($cdom =~ /\.[^.][^.]\.[^.][^.]$/ ? 3 : 2);
		598
		599	$cdom = substr $cdom, 1; # remove initial .
		600	} else {
		601	$cdom = $host;
		602	}
		603
		604	# store it
		605	$jar->{version} = 2;
		606	$jar->{lc $cdom}{$cpath}{$name} = \%kv;
		607
		608	redo if /\G\s*,/gc;
		609	}
		610	}
		611
		612	#############################################################################
		613	# keepalive/persistent connection cache
		614
		615	# fetch a connection from the keepalive cache
		616	sub ka_fetch($) {
		617	my $ka_key = shift;
		618
		619	my $hdl = pop @{ $KA_CACHE{$ka_key} }; # currently we reuse the MOST RECENTLY USED connection
		620	delete $KA_CACHE{$ka_key}
		621	unless @{ $KA_CACHE{$ka_key} };
		622
		623	$hdl
		624	}
		625
		626	sub ka_store($$) {
		627	my ($ka_key, $hdl) = @_;
		628
		629	my $kaa = $KA_CACHE{$ka_key} ||= [];
		630
		631	my $destroy = sub {
		632	my @ka = grep $_ != $hdl, @{ $KA_CACHE{$ka_key} };
		633
		634	$hdl->destroy;
		635
		636	@ka
		637	? $KA_CACHE{$ka_key} = \@ka
		638	: delete $KA_CACHE{$ka_key};
		639	};
		640
		641	# on error etc., destroy
		642	$hdl->on_error ($destroy);
		643	$hdl->on_eof ($destroy);
		644	$hdl->on_read ($destroy);
		645	$hdl->timeout ($PERSISTENT_TIMEOUT);
		646
		647	push @$kaa, $hdl;
		648	shift @$kaa while @$kaa > $MAX_PER_HOST;
		649	}
		650
		651	#############################################################################
		652	# utilities
		653
		654	# continue to parse $_ for headers and place them into the arg
		655	sub _parse_hdr() {
		656	my %hdr;
		657
		658	# things seen, not parsed:
		659	# p3pP="NON CUR OTPi OUR NOR UNI"
		660
		661	$hdr{lc $1} .= ",$2"
		662	while /\G
		663	([^:\000-\037]*):
		664	[\011\040]*
		665	((?: [^\012]+ | \012[\011\040] )*)
		666	\012
		667	/gxc;
		668
		669	/\G$/
		670	or return;
		671
		672	# remove the "," prefix we added to all headers above
		673	substr $_, 0, 1, ""
		674	for values %hdr;
		675
		676	\%hdr
		677	}
		678
		679	#############################################################################
		680	# http_get
		681
357	our $qr_nlnl = qr{(?<![^\012])\015?\012};	682	our $qr_nlnl = qr{(?<![^\012])\015?\012};
358		683
359	our $TLS_CTX_LOW = { cache => 1, sslv2 => 1 };	684	our $TLS_CTX_LOW = { cache => 1, sslv2 => 1 };
360	our $TLS_CTX_HIGH = { cache => 1, verify => 1, verify_peername => "https" };	685	our $TLS_CTX_HIGH = { cache => 1, verify => 1, verify_peername => "https" };
		686
		687	# maybe it should just become a normal object :/
		688
		689	sub _destroy_state(\%) {
		690	my ($state) = @_;
		691
		692	$state->{handle}->destroy if $state->{handle};
		693	%$state = ();
		694	}
		695
		696	sub _error(\%$$) {
		697	my ($state, $cb, $hdr) = @_;
		698
		699	&_destroy_state ($state);
		700
		701	$cb->(undef, $hdr);
		702	()
		703	}
		704
		705	our %IDEMPOTENT = (
		706	DELETE => 1,
		707	GET => 1,
		708	HEAD => 1,
		709	OPTIONS => 1,
		710	PUT => 1,
		711	TRACE => 1,
		712
		713	ACL => 1,
		714	"BASELINE-CONTROL" => 1,
		715	BIND => 1,
		716	CHECKIN => 1,
		717	CHECKOUT => 1,
		718	COPY => 1,
		719	LABEL => 1,
		720	LINK => 1,
		721	MERGE => 1,
		722	MKACTIVITY => 1,
		723	MKCALENDAR => 1,
		724	MKCOL => 1,
		725	MKREDIRECTREF => 1,
		726	MKWORKSPACE => 1,
		727	MOVE => 1,
		728	ORDERPATCH => 1,
		729	PROPFIND => 1,
		730	PROPPATCH => 1,
		731	REBIND => 1,
		732	REPORT => 1,
		733	SEARCH => 1,
		734	UNBIND => 1,
		735	UNCHECKOUT => 1,
		736	UNLINK => 1,
		737	UNLOCK => 1,
		738	UPDATE => 1,
		739	UPDATEREDIRECTREF => 1,
		740	"VERSION-CONTROL" => 1,
		741	);
361		742
362	sub http_request($$@) {	743	sub http_request($$@) {
363	my $cb = pop;	744	my $cb = pop;
364	my ($method, $url, %arg) = @_;	745	my ($method, $url, %arg) = @_;
365		746
…		…
383	my $recurse = exists $arg{recurse} ? delete $arg{recurse} : $MAX_RECURSE;	764	my $recurse = exists $arg{recurse} ? delete $arg{recurse} : $MAX_RECURSE;
384		765
385	return $cb->(undef, { @pseudo, Status => 599, Reason => "Too many redirections" })	766	return $cb->(undef, { @pseudo, Status => 599, Reason => "Too many redirections" })
386	if $recurse < 0;	767	if $recurse < 0;
387		768
388	my $proxy = $arg{proxy} || $PROXY;	769	my $proxy = exists $arg{proxy} ? $arg{proxy} : $PROXY;
389	my $timeout = $arg{timeout} || $TIMEOUT;	770	my $timeout = $arg{timeout} || $TIMEOUT;
390		771
391	my ($uscheme, $uauthority, $upath, $query, $fragment) =	772	my ($uscheme, $uauthority, $upath, $query, undef) = # ignore fragment
392	$url =~ m|(?:([^:/?#]+):)?(?://([^/?#]*))?([^?#]*)(?:(\?[^#]*))?(?:#(.*))?|;	773	$url =~ m|^([^:]+):(?://([^/?#]*))?([^?#]*)(?:(\?[^#]*))?(?:#(.*))?$|;
393		774
394	$uscheme = lc $uscheme;	775	$uscheme = lc $uscheme;
395		776
396	my $uport = $uscheme eq "http" ? 80	777	my $uport = $uscheme eq "http" ? 80
397	: $uscheme eq "https" ? 443	778	: $uscheme eq "https" ? 443
398	: return $cb->(undef, { @pseudo, Status => 599, Reason => "Only http and https URL schemes supported" });	779	: return $cb->(undef, { @pseudo, Status => 599, Reason => "Only http and https URL schemes supported" });
399		780
400	$uauthority =~ /^(?: .*\@ )? ([^\@:]+) (?: : (\d+) )?$/x	781	$uauthority =~ /^(?: .*\@ )? ([^\@]+?) (?: : (\d+) )?$/x
401	or return $cb->(undef, { @pseudo, Status => 599, Reason => "Unparsable URL" });	782	or return $cb->(undef, { @pseudo, Status => 599, Reason => "Unparsable URL" });
402		783
403	my $uhost = $1;	784	my $uhost = lc $1;
404	$uport = $2 if defined $2;	785	$uport = $2 if defined $2;
405		786
406	$hdr{host} = defined $2 ? "$uhost:$2" : "$uhost"	787	$hdr{host} = defined $2 ? "$uhost:$2" : "$uhost"
407	unless exists $hdr{host};	788	unless exists $hdr{host};
408		789
…		…
411		792
412	$upath =~ s%^/?%/%;	793	$upath =~ s%^/?%/%;
413		794
414	# cookie processing	795	# cookie processing
415	if (my $jar = $arg{cookie_jar}) {	796	if (my $jar = $arg{cookie_jar}) {
416	%$jar = () if $jar->{version} != 1;	797	my $cookies = cookie_jar_extract $jar, $uscheme, $uhost, $upath;
417		798
418	my @cookie;
419
420	while (my ($chost, $v) = each %$jar) {
421	if ($chost =~ /^\./) {
422	next unless $chost eq substr $uhost, -length $chost;
423	} elsif ($chost =~ /\./) {
424	next unless $chost eq $uhost;
425	} else {
426	next;
427	}
428
429	while (my ($cpath, $v) = each %$v) {
430	next unless $cpath eq substr $upath, 0, length $cpath;
431
432	while (my ($k, $v) = each %$v) {
433	next if $uscheme ne "https" && exists $v->{secure};
434	my $value = $v->{value};
435	$value =~ s/([\\"])/\\$1/g;
436	push @cookie, "$k=\"$value\"";
437	}
438	}
439	}
440
441	$hdr{cookie} = join "; ", @cookie	799	$hdr{cookie} = join "; ", @$cookies
442	if @cookie;	800	if @$cookies;
443	}	801	}
444		802
445	my ($rhost, $rport, $rscheme, $rpath); # request host, port, path	803	my ($rhost, $rport, $rscheme, $rpath); # request host, port, path
446		804
447	if ($proxy) {	805	if ($proxy) {
…		…
450	$rscheme = "http" unless defined $rscheme;	808	$rscheme = "http" unless defined $rscheme;
451		809
452	# don't support https requests over https-proxy transport,	810	# don't support https requests over https-proxy transport,
453	# can't be done with tls as spec'ed, unless you double-encrypt.	811	# can't be done with tls as spec'ed, unless you double-encrypt.
454	$rscheme = "http" if $uscheme eq "https" && $rscheme eq "https";	812	$rscheme = "http" if $uscheme eq "https" && $rscheme eq "https";
		813
		814	$rhost = lc $rhost;
		815	$rscheme = lc $rscheme;
455	} else {	816	} else {
456	($rhost, $rport, $rscheme, $rpath) = ($uhost, $uport, $uscheme, $upath);	817	($rhost, $rport, $rscheme, $rpath) = ($uhost, $uport, $uscheme, $upath);
457	}	818	}
458		819
459	# leave out fragment and query string, just a heuristic	820	# leave out fragment and query string, just a heuristic
460	$hdr{referer} ||= "$uscheme://$uauthority$upath" unless exists $hdr{referer};	821	$hdr{referer} = "$uscheme://$uauthority$upath" unless exists $hdr{referer};
461	$hdr{"user-agent"} ||= $USERAGENT unless exists $hdr{"user-agent"};	822	$hdr{"user-agent"} = $USERAGENT unless exists $hdr{"user-agent"};
462		823
463	$hdr{"content-length"} = length $arg{body}	824	$hdr{"content-length"} = length $arg{body}
464	if length $arg{body} || $method ne "GET";	825	if length $arg{body} || $method ne "GET";
465		826
		827	my $idempotent = $IDEMPOTENT{$method};
		828
		829	# default value for keepalive is true iff the request is for an idempotent method
		830	my $persistent = exists $arg{persistent} ? !!$arg{persistent} : $idempotent;
		831	my $keepalive = exists $arg{keepalive} ? !!$arg{keepalive} : !$proxy;
		832	my $was_persistent; # true if this is actually a recycled connection
		833
		834	# the key to use in the keepalive cache
		835	my $ka_key = "$uscheme\x00$uhost\x00$uport\x00$arg{sessionid}";
		836
		837	$hdr{connection} = ($persistent ? $keepalive ? "keep-alive, " : "" : "close, ") . "Te"; #1.1
		838	$hdr{te} = "trailers" unless exists $hdr{te}; #1.1
		839
466	my %state = (connect_guard => 1);	840	my %state = (connect_guard => 1);
		841
		842	my $ae_error = 595; # connecting
		843
		844	# handle actual, non-tunneled, request
		845	my $handle_actual_request = sub {
		846	$ae_error = 596; # request phase
		847
		848	my $hdl = $state{handle};
		849
		850	$hdl->starttls ("connect") if $uscheme eq "https" && !exists $hdl->{tls};
		851
		852	# send request
		853	$hdl->push_write (
		854	"$method $rpath HTTP/1.1\015\012"
		855	. (join "", map "\u$_: $hdr{$_}\015\012", grep defined $hdr{$_}, keys %hdr)
		856	. "\015\012"
		857	. $arg{body}
		858	);
		859
		860	# return if error occurred during push_write()
		861	return unless %state;
		862
		863	# reduce memory usage, save a kitten, also re-use it for the response headers.
		864	%hdr = ();
		865
		866	# status line and headers
		867	$state{read_response} = sub {
		868	return unless %state;
		869
		870	for ("$_[1]") {
		871	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
		872
		873	/^HTTP\/0*([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\012]*) )? \012/gxci
		874	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Invalid server response" };
		875
		876	# 100 Continue handling
		877	# should not happen as we don't send expect: 100-continue,
		878	# but we handle it just in case.
		879	# since we send the request body regardless, if we get an error
		880	# we are out of-sync, which we currently do NOT handle correctly.
		881	return $state{handle}->push_read (line => $qr_nlnl, $state{read_response})
		882	if $2 eq 100;
		883
		884	push @pseudo,
		885	HTTPVersion => $1,
		886	Status => $2,
		887	Reason => $3,
		888	;
		889
		890	my $hdr = _parse_hdr
		891	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Garbled response headers" };
		892
		893	%hdr = (%$hdr, @pseudo);
		894	}
		895
		896	# redirect handling
		897	# relative uri handling forced by microsoft and other shitheads.
		898	# we give our best and fall back to URI if available.
		899	if (exists $hdr{location}) {
		900	my $loc = $hdr{location};
		901
		902	if ($loc =~ m%^//%) { # //
		903	$loc = "$uscheme:$loc";
		904
		905	} elsif ($loc eq "") {
		906	$loc = $url;
		907
		908	} elsif ($loc !~ /^(?: $ | [^:\/?\#]+ : )/x) { # anything "simple"
		909	$loc =~ s/^\.\/+//;
		910
		911	if ($loc !~ m%^[.?#]%) {
		912	my $prefix = "$uscheme://$uauthority";
		913
		914	unless ($loc =~ s/^\///) {
		915	$prefix .= $upath;
		916	$prefix =~ s/\/[^\/]*$//;
		917	}
		918
		919	$loc = "$prefix/$loc";
		920
		921	} elsif (eval { require URI }) { # uri
		922	$loc = URI->new_abs ($loc, $url)->as_string;
		923
		924	} else {
		925	return _error %state, $cb, { @pseudo, Status => 599, Reason => "Cannot parse Location (URI module missing)" };
		926	#$hdr{Status} = 599;
		927	#$hdr{Reason} = "Unparsable Redirect (URI module missing)";
		928	#$recurse = 0;
		929	}
		930	}
		931
		932	$hdr{location} = $loc;
		933	}
		934
		935	my $redirect;
		936
		937	if ($recurse) {
		938	my $status = $hdr{Status};
		939
		940	# industry standard is to redirect POST as GET for
		941	# 301, 302 and 303, in contrast to HTTP/1.0 and 1.1.
		942	# also, the UA should ask the user for 301 and 307 and POST,
		943	# industry standard seems to be to simply follow.
		944	# we go with the industry standard. 308 is defined
		945	# by rfc7538
		946	if ($status == 301 or $status == 302 or $status == 303) {
		947	$redirect = 1;
		948	# HTTP/1.1 is unclear on how to mutate the method
		949	unless ($method eq "HEAD") {
		950	$method = "GET";
		951	delete $arg{body};
		952	}
		953	} elsif ($status == 307 or $status == 308) {
		954	$redirect = 1;
		955	}
		956	}
		957
		958	my $finish = sub { # ($data, $err_status, $err_reason[, $persistent])
		959	if ($state{handle}) {
		960	# handle keepalive
		961	if (
		962	$persistent
		963	&& $_[3]
		964	&& ($hdr{HTTPVersion} < 1.1
		965	? $hdr{connection} =~ /\bkeep-?alive\b/i
		966	: $hdr{connection} !~ /\bclose\b/i)
		967	) {
		968	ka_store $ka_key, delete $state{handle};
		969	} else {
		970	# no keepalive, destroy the handle
		971	$state{handle}->destroy;
		972	}
		973	}
		974
		975	%state = ();
		976
		977	if (defined $_[1]) {
		978	$hdr{OrigStatus} = $hdr{Status}; $hdr{Status} = $_[1];
		979	$hdr{OrigReason} = $hdr{Reason}; $hdr{Reason} = $_[2];
		980	}
		981
		982	# set-cookie processing
		983	if ($arg{cookie_jar}) {
		984	cookie_jar_set_cookie $arg{cookie_jar}, $hdr{"set-cookie"}, $uhost, $hdr{date};
		985	}
		986
		987	if ($redirect && exists $hdr{location}) {
		988	# we ignore any errors, as it is very common to receive
		989	# Content-Length != 0 but no actual body
		990	# we also access %hdr, as $_[1] might be an erro
		991	$state{recurse} =
		992	http_request (
		993	$method => $hdr{location},
		994	%arg,
		995	recurse => $recurse - 1,
		996	Redirect => [$_[0], \%hdr],
		997	sub {
		998	%state = ();
		999	&$cb
		1000	},
		1001	);
		1002	} else {
		1003	$cb->($_[0], \%hdr);
		1004	}
		1005	};
		1006
		1007	$ae_error = 597; # body phase
		1008
		1009	my $chunked = $hdr{"transfer-encoding"} =~ /\bchunked\b/i; # not quite correct...
		1010
		1011	my $len = $chunked ? undef : $hdr{"content-length"};
		1012
		1013	# body handling, many different code paths
		1014	# - no body expected
		1015	# - want_body_handle
		1016	# - te chunked
		1017	# - 2x length known (with or without on_body)
		1018	# - 2x length not known (with or without on_body)
		1019	if (!$redirect && $arg{on_header} && !$arg{on_header}(\%hdr)) {
		1020	$finish->(undef, 598 => "Request cancelled by on_header");
		1021	} elsif (
		1022	$hdr{Status} =~ /^(?:1..|204|205|304)$/
		1023	or $method eq "HEAD"
		1024	or (defined $len && $len == 0) # == 0, not !, because "0 " is true
		1025	) {
		1026	# no body
		1027	$finish->("", undef, undef, 1);
		1028
		1029	} elsif (!$redirect && $arg{want_body_handle}) {
		1030	$_[0]->on_eof (undef);
		1031	$_[0]->on_error (undef);
		1032	$_[0]->on_read (undef);
		1033
		1034	$finish->(delete $state{handle});
		1035
		1036	} elsif ($chunked) {
		1037	my $cl = 0;
		1038	my $body = "";
		1039	my $on_body = (!$redirect && $arg{on_body}) || sub { $body .= shift; 1 };
		1040
		1041	$state{read_chunk} = sub {
		1042	$_[1] =~ /^([0-9a-fA-F]+)/
		1043	or return $finish->(undef, $ae_error => "Garbled chunked transfer encoding");
		1044
		1045	my $len = hex $1;
		1046
		1047	if ($len) {
		1048	$cl += $len;
		1049
		1050	$_[0]->push_read (chunk => $len, sub {
		1051	$on_body->($_[1], \%hdr)
		1052	or return $finish->(undef, 598 => "Request cancelled by on_body");
		1053
		1054	$_[0]->push_read (line => sub {
		1055	length $_[1]
		1056	and return $finish->(undef, $ae_error => "Garbled chunked transfer encoding");
		1057	$_[0]->push_read (line => $state{read_chunk});
		1058	});
		1059	});
		1060	} else {
		1061	$hdr{"content-length"} ||= $cl;
		1062
		1063	$_[0]->push_read (line => $qr_nlnl, sub {
		1064	if (length $_[1]) {
		1065	for ("$_[1]") {
		1066	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
		1067
		1068	my $hdr = _parse_hdr
		1069	or return $finish->(undef, $ae_error => "Garbled response trailers");
		1070
		1071	%hdr = (%hdr, %$hdr);
		1072	}
		1073	}
		1074
		1075	$finish->($body, undef, undef, 1);
		1076	});
		1077	}
		1078	};
		1079
		1080	$_[0]->push_read (line => $state{read_chunk});
		1081
		1082	} elsif (!$redirect && $arg{on_body}) {
		1083	if (defined $len) {
		1084	$_[0]->on_read (sub {
		1085	$len -= length $_[0]{rbuf};
		1086
		1087	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
		1088	or return $finish->(undef, 598 => "Request cancelled by on_body");
		1089
		1090	$len > 0
		1091	or $finish->("", undef, undef, 1);
		1092	});
		1093	} else {
		1094	$_[0]->on_eof (sub {
		1095	$finish->("");
		1096	});
		1097	$_[0]->on_read (sub {
		1098	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
		1099	or $finish->(undef, 598 => "Request cancelled by on_body");
		1100	});
		1101	}
		1102	} else {
		1103	$_[0]->on_eof (undef);
		1104
		1105	if (defined $len) {
		1106	$_[0]->on_read (sub {
		1107	$finish->((substr delete $_[0]{rbuf}, 0, $len, ""), undef, undef, 1)
		1108	if $len <= length $_[0]{rbuf};
		1109	});
		1110	} else {
		1111	$_[0]->on_error (sub {
		1112	($! == Errno::EPIPE || !$!)
		1113	? $finish->(delete $_[0]{rbuf})
		1114	: $finish->(undef, $ae_error => $_[2]);
		1115	});
		1116	$_[0]->on_read (sub { });
		1117	}
		1118	}
		1119	};
		1120
		1121	# if keepalive is enabled, then the server closing the connection
		1122	# before a response can happen legally - we retry on idempotent methods.
		1123	if ($was_persistent && $idempotent) {
		1124	my $old_eof = $hdl->{on_eof};
		1125	$hdl->{on_eof} = sub {
		1126	_destroy_state %state;
		1127
		1128	%state = ();
		1129	$state{recurse} =
		1130	http_request (
		1131	$method => $url,
		1132	%arg,
		1133	recurse => $recurse - 1,
		1134	persistent => 0,
		1135	sub {
		1136	%state = ();
		1137	&$cb
		1138	}
		1139	);
		1140	};
		1141	$hdl->on_read (sub {
		1142	return unless %state;
		1143
		1144	# as soon as we receive something, a connection close
		1145	# once more becomes a hard error
		1146	$hdl->{on_eof} = $old_eof;
		1147	$hdl->push_read (line => $qr_nlnl, $state{read_response});
		1148	});
		1149	} else {
		1150	$hdl->push_read (line => $qr_nlnl, $state{read_response});
		1151	}
		1152	};
		1153
		1154	my $prepare_handle = sub {
		1155	my ($hdl) = $state{handle};
		1156
		1157	$hdl->on_error (sub {
		1158	_error %state, $cb, { @pseudo, Status => $ae_error, Reason => $_[2] };
		1159	});
		1160	$hdl->on_eof (sub {
		1161	_error %state, $cb, { @pseudo, Status => $ae_error, Reason => "Unexpected end-of-file" };
		1162	});
		1163	$hdl->timeout_reset;
		1164	$hdl->timeout ($timeout);
		1165	};
		1166
		1167	# connected to proxy (or origin server)
		1168	my $connect_cb = sub {
		1169	my $fh = shift
		1170	or return _error %state, $cb, { @pseudo, Status => $ae_error, Reason => "$!" };
		1171
		1172	return unless delete $state{connect_guard};
		1173
		1174	# get handle
		1175	$state{handle} = new AnyEvent::Handle
		1176	%{ $arg{handle_params} },
		1177	fh => $fh,
		1178	peername => $uhost,
		1179	tls_ctx => $arg{tls_ctx},
		1180	;
		1181
		1182	$prepare_handle->();
		1183
		1184	#$state{handle}->starttls ("connect") if $rscheme eq "https";
		1185
		1186	# now handle proxy-CONNECT method
		1187	if ($proxy && $uscheme eq "https") {
		1188	# oh dear, we have to wrap it into a connect request
		1189
		1190	my $auth = exists $hdr{"proxy-authorization"}
		1191	? "proxy-authorization: " . (delete $hdr{"proxy-authorization"}) . "\015\012"
		1192	: "";
		1193
		1194	# maybe re-use $uauthority with patched port?
		1195	$state{handle}->push_write ("CONNECT $uhost:$uport HTTP/1.0\015\012$auth\015\012");
		1196	$state{handle}->push_read (line => $qr_nlnl, sub {
		1197	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix
		1198	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Invalid proxy connect response ($_[1])" };
		1199
		1200	if ($2 == 200) {
		1201	$rpath = $upath;
		1202	$handle_actual_request->();
		1203	} else {
		1204	_error %state, $cb, { @pseudo, Status => $2, Reason => $3 };
		1205	}
		1206	});
		1207	} else {
		1208	delete $hdr{"proxy-authorization"} unless $proxy;
		1209
		1210	$handle_actual_request->();
		1211	}
		1212	};
467		1213
468	_get_slot $uhost, sub {	1214	_get_slot $uhost, sub {
469	$state{slot_guard} = shift;	1215	$state{slot_guard} = shift;
470		1216
471	return unless $state{connect_guard};	1217	return unless $state{connect_guard};
472		1218
473	my $connect_cb = sub {	1219	# try to use an existing keepalive connection, but only if we, ourselves, plan
474	$state{fh} = shift	1220	# on a keepalive request (in theory, this should be a separate config option).
475	or do {	1221	if ($persistent && $KA_CACHE{$ka_key}) {
476	my $err = "$!";	1222	$was_persistent = 1;
477	%state = ();
478	return $cb->(undef, { @pseudo, Status => 599, Reason => $err });
479	};
480		1223
481	pop; # free memory, save a tree	1224	$state{handle} = ka_fetch $ka_key;
482		1225	# $state{handle}->destroyed
483	return unless delete $state{connect_guard};	1226	# and die "AnyEvent::HTTP: unexpectedly got a destructed handle (1), please report.";#d#
484		1227	$prepare_handle->();
485	# get handle	1228	# $state{handle}->destroyed
486	$state{handle} = new AnyEvent::Handle	1229	# and die "AnyEvent::HTTP: unexpectedly got a destructed handle (2), please report.";#d#
487	fh => $state{fh},
488	peername => $rhost,
489	tls_ctx => $arg{tls_ctx},
490	# these need to be reconfigured on keepalive handles
491	timeout => $timeout,
492	on_error => sub {
493	%state = ();
494	$cb->(undef, { @pseudo, Status => 599, Reason => $_[2] });
495	},
496	on_eof => sub {
497	%state = ();
498	$cb->(undef, { @pseudo, Status => 599, Reason => "Unexpected end-of-file" });
499	},
500	;
501
502	# limit the number of persistent connections
503	# keepalive not yet supported
504	# if ($KA_COUNT{$_[1]} < $MAX_PERSISTENT_PER_HOST) {
505	# ++$KA_COUNT{$_[1]};
506	# $state{handle}{ka_count_guard} = AnyEvent::Util::guard {
507	# --$KA_COUNT{$_[1]}
508	# };
509	# $hdr{connection} = "keep-alive";
510	# } else {
511	delete $hdr{connection};
512	# }
513
514	$state{handle}->starttls ("connect") if $rscheme eq "https";
515
516	# handle actual, non-tunneled, request
517	my $handle_actual_request = sub {
518	$state{handle}->starttls ("connect") if $uscheme eq "https" && !exists $state{handle}{tls};
519
520	# send request
521	$state{handle}->push_write (
522	"$method $rpath HTTP/1.0\015\012"
523	. (join "", map "\u$_: $hdr{$_}\015\012", grep defined $hdr{$_}, keys %hdr)
524	. "\015\012"
525	. (delete $arg{body})
526	);
527
528	# return if error occured during push_write()
529	return unless %state;
530
531	%hdr = (); # reduce memory usage, save a kitten, also make it possible to re-use
532
533	# status line and headers
534	$state{handle}->push_read (line => $qr_nlnl, sub {
535	my $keepalive = pop;
536
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, { @pseudo, Status => 599, Reason => "Invalid server response" }));
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, { @pseudo, Status => 599, Reason => "Garbled response headers" }));
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 { # ($data, $err_status, $err_reason[, $keepalive])
607	$state{handle}->destroy if $state{handle};
608	%state = ();
609
610	if (defined $_[1]) {
611	$hdr{OrigStatus} = $hdr{Status}; $hdr{Status} = $_[1];
612	$hdr{OrigReason} = $hdr{Reason}; $hdr{Reason} = $_[2];
613	}
614
615	# set-cookie processing
616	if ($arg{cookie_jar}) {
617	for ($hdr{"set-cookie"}) {
618	# parse NAME=VALUE
619	my @kv;
620
621	while (/\G\s* ([^=;,[:space:]]+) \s*=\s* (?: "((?:[^\\"]+|\\.)*)" | ([^=;,[:space:]]*) )/gcxs) {
622	my $name = $1;
623	my $value = $3;
624
625	unless ($value) {
626	$value = $2;
627	$value =~ s/\\(.)/$1/gs;
628	}
629
630	push @kv, $name => $value;
631
632	last unless /\G\s*;/gc;
633	}
634
635	last unless @kv;
636
637	my $name = shift @kv;
638	my %kv = (value => shift @kv, @kv);
639
640	my $cdom;
641	my $cpath = (delete $kv{path}) || "/";
642
643	if (exists $kv{domain}) {
644	$cdom = delete $kv{domain};
645
646	$cdom =~ s/^\.?/./; # make sure it starts with a "."
647
648	next if $cdom =~ /\.$/;
649
650	# this is not rfc-like and not netscape-like. go figure.
651	my $ndots = $cdom =~ y/.//;
652	next if $ndots < ($cdom =~ /\.[^.][^.]\.[^.][^.]$/ ? 3 : 2);
653	} else {
654	$cdom = $uhost;
655	}
656
657	# store it
658	$arg{cookie_jar}{version} = 1;
659	$arg{cookie_jar}{$cdom}{$cpath}{$name} = \%kv;
660
661	redo if /\G\s*,/gc;
662	}
663	}
664
665	if ($redirect && exists $hdr{location}) {
666	# we ignore any errors, as it is very common to receive
667	# Content-Length != 0 but no actual body
668	# we also access %hdr, as $_[1] might be an erro
669	http_request (
670	$method => $hdr{location},
671	%arg,
672	recurse => $recurse - 1,
673	Redirect => [$_[0], \%hdr],
674	$cb);
675	} else {
676	$cb->($_[0], \%hdr);
677	}
678	};
679
680	my $len = $hdr{"content-length"};
681
682	if (!$redirect && $arg{on_header} && !$arg{on_header}(\%hdr)) {
683	$finish->(undef, 598 => "Request cancelled by on_header");
684	} elsif (
685	$hdr{Status} =~ /^(?:1..|204|205|304)$/
686	or $method eq "HEAD"
687	or (defined $len && !$len)
688	) {
689	# no body
690	$finish->("", undef, undef, 1);
691	} else {
692	# body handling, four different code paths
693	# for want_body_handle, on_body (2x), normal (2x)
694	# we might read too much here, but it does not matter yet (no pipelining)
695	if (!$redirect && $arg{want_body_handle}) {
696	$_[0]->on_eof (undef);
697	$_[0]->on_error (undef);
698	$_[0]->on_read (undef);
699
700	$finish->(delete $state{handle});
701
702	} elsif ($arg{on_body}) {
703	$_[0]->on_error (sub { $finish->(undef, 599 => $_[2]) });
704	if ($len) {
705	$_[0]->on_read (sub {
706	$len -= length $_[0]{rbuf};
707
708	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
709	or $finish->(undef, 598 => "Request cancelled by on_body");
710
711	$len > 0
712	or $finish->("", undef, undef, 1);
713	});
714	} else {
715	$_[0]->on_eof (sub {
716	$finish->("");
717	});
718	$_[0]->on_read (sub {
719	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
720	or $finish->(undef, 598 => "Request cancelled by on_body");
721	});
722	}
723	} else {
724	$_[0]->on_eof (undef);
725
726	if ($len) {
727	$_[0]->on_error (sub { $finish->(undef, 599 => $_[2]) });
728	$_[0]->on_read (sub {
729	$finish->((substr delete $_[0]{rbuf}, 0, $len, ""), undef, undef, 1)
730	if $len <= length $_[0]{rbuf};
731	});
732	} else {
733	$_[0]->on_error (sub {
734	($! == Errno::EPIPE || !$!)
735	? $finish->(delete $_[0]{rbuf})
736	: $finish->(undef, 599 => $_[2]);
737	});
738	$_[0]->on_read (sub { });
739	}
740	}
741	}
742	});
743	};
744
745	# now handle proxy-CONNECT method
746	if ($proxy && $uscheme eq "https") {
747	# oh dear, we have to wrap it into a connect request
748
749	# maybe re-use $uauthority with patched port?
750	$state{handle}->push_write ("CONNECT $uhost:$uport HTTP/1.0\015\012Host: $uhost\015\012\015\012");
751	$state{handle}->push_read (line => $qr_nlnl, sub {
752	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix
753	or return (%state = (), $cb->(undef, { @pseudo, Status => 599, Reason => "Invalid proxy connect response ($_[1])" }));
754
755	if ($2 == 200) {
756	$rpath = $upath;
757	&$handle_actual_request;	1230	$handle_actual_request->();
758	} else {	1231
759	%state = ();
760	$cb->(undef, { @pseudo, Status => $2, Reason => $3 });
761	}
762	});
763	} else {	1232	} else {
764	&$handle_actual_request;
765	}
766	};
767
768	my $tcp_connect = $arg{tcp_connect}	1233	my $tcp_connect = $arg{tcp_connect}
769	|| do { require AnyEvent::Socket; \&AnyEvent::Socket::tcp_connect };	1234	|| do { require AnyEvent::Socket; \&AnyEvent::Socket::tcp_connect };
770		1235
771	$state{connect_guard} = $tcp_connect->($rhost, $rport, $connect_cb, $arg{on_prepare} || sub { $timeout });	1236	$state{connect_guard} = $tcp_connect->($rhost, $rport, $connect_cb, $arg{on_prepare} || sub { $timeout });
772		1237	}
773	};	1238	};
774		1239
775	defined wantarray && AnyEvent::Util::guard { %state = () }	1240	defined wantarray && AnyEvent::Util::guard { _destroy_state %state }
776	}	1241	}
777		1242
778	sub http_get($@) {	1243	sub http_get($@) {
779	unshift @_, "GET";	1244	unshift @_, "GET";
780	&http_request	1245	&http_request
…		…
798	AnyEvent::HTTP uses the AnyEvent::Socket::tcp_connect function for	1263	AnyEvent::HTTP uses the AnyEvent::Socket::tcp_connect function for
799	the actual connection, which in turn uses AnyEvent::DNS to resolve	1264	the actual connection, which in turn uses AnyEvent::DNS to resolve
800	hostnames. The latter is a simple stub resolver and does no caching	1265	hostnames. The latter is a simple stub resolver and does no caching
801	on its own. If you want DNS caching, you currently have to provide	1266	on its own. If you want DNS caching, you currently have to provide
802	your own default resolver (by storing a suitable resolver object in	1267	your own default resolver (by storing a suitable resolver object in
803	C<$AnyEvent::DNS::RESOLVER>).	1268	C<$AnyEvent::DNS::RESOLVER>) or your own C<tcp_connect> callback.
804		1269
805	=head2 GLOBAL FUNCTIONS AND VARIABLES	1270	=head2 GLOBAL FUNCTIONS AND VARIABLES
806		1271
807	=over 4	1272	=over 4
808		1273
809	=item AnyEvent::HTTP::set_proxy "proxy-url"	1274	=item AnyEvent::HTTP::set_proxy "proxy-url"
810		1275
811	Sets the default proxy server to use. The proxy-url must begin with a	1276	Sets the default proxy server to use. The proxy-url must begin with a
812	string of the form C<http://host:port> (optionally C<https:...>), croaks	1277	string of the form C<http://host:port>, croaks otherwise.
813	otherwise.
814		1278
815	To clear an already-set proxy, use C<undef>.	1279	To clear an already-set proxy, use C<undef>.
		1280
		1281	When AnyEvent::HTTP is loaded for the first time it will query the
		1282	default proxy from the operating system, currently by looking at
		1283	C<$ENV{http_proxy>}.
		1284
		1285	=item AnyEvent::HTTP::cookie_jar_expire $jar[, $session_end]
		1286
		1287	Remove all cookies from the cookie jar that have been expired. If
		1288	C<$session_end> is given and true, then additionally remove all session
		1289	cookies.
		1290
		1291	You should call this function (with a true C<$session_end>) before you
		1292	save cookies to disk, and you should call this function after loading them
		1293	again. If you have a long-running program you can additionally call this
		1294	function from time to time.
		1295
		1296	A cookie jar is initially an empty hash-reference that is managed by this
		1297	module. Its format is subject to change, but currently it is as follows:
		1298
		1299	The key C<version> has to contain C<2>, otherwise the hash gets
		1300	cleared. All other keys are hostnames or IP addresses pointing to
		1301	hash-references. The key for these inner hash references is the
		1302	server path for which this cookie is meant, and the values are again
		1303	hash-references. Each key of those hash-references is a cookie name, and
		1304	the value, you guessed it, is another hash-reference, this time with the
		1305	key-value pairs from the cookie, except for C<expires> and C<max-age>,
		1306	which have been replaced by a C<_expires> key that contains the cookie
		1307	expiry timestamp. Session cookies are indicated by not having an
		1308	C<_expires> key.
		1309
		1310	Here is an example of a cookie jar with a single cookie, so you have a
		1311	chance of understanding the above paragraph:
		1312
		1313	{
		1314	version => 1,
		1315	"10.0.0.1" => {
		1316	"/" => {
		1317	"mythweb_id" => {
		1318	_expires => 1293917923,
		1319	value => "ooRung9dThee3ooyXooM1Ohm",
		1320	},
		1321	},
		1322	},
		1323	}
816		1324
817	=item $date = AnyEvent::HTTP::format_date $timestamp	1325	=item $date = AnyEvent::HTTP::format_date $timestamp
818		1326
819	Takes a POSIX timestamp (seconds since the epoch) and formats it as a HTTP	1327	Takes a POSIX timestamp (seconds since the epoch) and formats it as a HTTP
820	Date (RFC 2616).	1328	Date (RFC 2616).
821		1329
822	=item $timestamp = AnyEvent::HTTP::parse_date $date	1330	=item $timestamp = AnyEvent::HTTP::parse_date $date
823		1331
824	Takes a HTTP Date (RFC 2616) and returns the corresponding POSIX	1332	Takes a HTTP Date (RFC 2616) or a Cookie date (netscape cookie spec) or a
		1333	bunch of minor variations of those, and returns the corresponding POSIX
825	timestamp, or C<undef> if the date cannot be parsed.	1334	timestamp, or C<undef> if the date cannot be parsed.
826		1335
827	=item $AnyEvent::HTTP::MAX_RECURSE	1336	=item $AnyEvent::HTTP::MAX_RECURSE
828		1337
829	The default value for the C<recurse> request parameter (default: C<10>).	1338	The default value for the C<recurse> request parameter (default: C<10>).
		1339
		1340	=item $AnyEvent::HTTP::TIMEOUT
		1341
		1342	The default timeout for connection operations (default: C<300>).
830		1343
831	=item $AnyEvent::HTTP::USERAGENT	1344	=item $AnyEvent::HTTP::USERAGENT
832		1345
833	The default value for the C<User-Agent> header (the default is	1346	The default value for the C<User-Agent> header (the default is
834	C<Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>).	1347	C<Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>).
835		1348
836	=item $AnyEvent::HTTP::MAX_PER_HOST	1349	=item $AnyEvent::HTTP::MAX_PER_HOST
837		1350
838	The maximum number of concurrent connections to the same host (identified	1351	The maximum number of concurrent connections to the same host (identified
839	by the hostname). If the limit is exceeded, then the additional requests	1352	by the hostname). If the limit is exceeded, then additional requests
840	are queued until previous connections are closed.	1353	are queued until previous connections are closed. Both persistent and
		1354	non-persistent connections are counted in this limit.
841		1355
842	The default value for this is C<4>, and it is highly advisable to not	1356	The default value for this is C<4>, and it is highly advisable to not
843	increase it.	1357	increase it much.
		1358
		1359	For comparison: the RFC's recommend 4 non-persistent or 2 persistent
		1360	connections, older browsers used 2, newer ones (such as firefox 3)
		1361	typically use 6, and Opera uses 8 because like, they have the fastest
		1362	browser and give a shit for everybody else on the planet.
		1363
		1364	=item $AnyEvent::HTTP::PERSISTENT_TIMEOUT
		1365
		1366	The time after which idle persistent connections get closed by
		1367	AnyEvent::HTTP (default: C<3>).
844		1368
845	=item $AnyEvent::HTTP::ACTIVE	1369	=item $AnyEvent::HTTP::ACTIVE
846		1370
847	The number of active connections. This is not the number of currently	1371	The number of active connections. This is not the number of currently
848	running requests, but the number of currently open and non-idle TCP	1372	running requests, but the number of currently open and non-idle TCP
849	connections. This number of can be useful for load-leveling.	1373	connections. This number can be useful for load-leveling.
850		1374
851	=back	1375	=back
852		1376
853	=cut	1377	=cut
854		1378
…		…
869	sub parse_date($) {	1393	sub parse_date($) {
870	my ($date) = @_;	1394	my ($date) = @_;
871		1395
872	my ($d, $m, $y, $H, $M, $S);	1396	my ($d, $m, $y, $H, $M, $S);
873		1397
874	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$/) {	1398	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$/) {
875	# RFC 822/1123, required by RFC 2616	1399	# RFC 822/1123, required by RFC 2616 (with " ")
		1400	# cookie dates (with "-")
		1401
876	($d, $m, $y, $H, $M, $S) = ($1, $2, $3, $4, $5, $6);	1402	($d, $m, $y, $H, $M, $S) = ($1, $2, $3, $4, $5, $6);
877		1403
878	} 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$/) {	1404	} 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$/) {
879	# RFC 850	1405	# RFC 850
880	($d, $m, $y, $H, $M, $S) = ($1, $2, $3 < 69 ? $3 + 2000 : $3 + 1900, $4, $5, $6);	1406	($d, $m, $y, $H, $M, $S) = ($1, $2, $3 < 69 ? $3 + 2000 : $3 + 1900, $4, $5, $6);
881		1407
882	} 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])$/) {	1408	} 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])$/) {
883	# ISO C's asctime	1409	# ISO C's asctime
884	($d, $m, $y, $H, $M, $S) = ($2, $1, $6, $3, $4, $5);	1410	($d, $m, $y, $H, $M, $S) = ($2, $1, $6, $3, $4, $5);
885	}	1411	}
886	# other formats fail in the loop below	1412	# other formats fail in the loop below
887		1413
888	for (0..11) {	1414	for (0..11) {
889	if ($m eq $month[$_]) {	1415	if ($m eq $month[$_]) {
890	require Time::Local;	1416	require Time::Local;
891	return Time::Local::timegm ($S, $M, $H, $d, $_, $y);	1417	return eval { Time::Local::timegm ($S, $M, $H, $d, $_, $y) };
892	}	1418	}
893	}	1419	}
894		1420
895	undef	1421	undef
896	}	1422	}
897		1423
898	sub set_proxy($) {	1424	sub set_proxy($) {
899	if (length $_[0]) {	1425	if (length $_[0]) {
900	$_[0] =~ m%^(https?):// ([^:/]+) (?: : (\d*) )?%ix	1426	$_[0] =~ m%^(http):// ([^:/]+) (?: : (\d*) )?%ix
901	or Carp::croak "$_[0]: invalid proxy URL";	1427	or Carp::croak "$_[0]: invalid proxy URL";
902	$PROXY = [$2, $3 || 3128, $1]	1428	$PROXY = [$2, $3 || 3128, $1]
903	} else {	1429	} else {
904	undef $PROXY;	1430	undef $PROXY;
905	}	1431	}
…		…
908	# initialise proxy from environment	1434	# initialise proxy from environment
909	eval {	1435	eval {
910	set_proxy $ENV{http_proxy};	1436	set_proxy $ENV{http_proxy};
911	};	1437	};
912		1438
		1439	=head2 SHOWCASE
		1440
		1441	This section contains some more elaborate "real-world" examples or code
		1442	snippets.
		1443
		1444	=head2 HTTP/1.1 FILE DOWNLOAD
		1445
		1446	Downloading files with HTTP can be quite tricky, especially when something
		1447	goes wrong and you want to resume.
		1448
		1449	Here is a function that initiates and resumes a download. It uses the
		1450	last modified time to check for file content changes, and works with many
		1451	HTTP/1.0 servers as well, and usually falls back to a complete re-download
		1452	on older servers.
		1453
		1454	It calls the completion callback with either C<undef>, which means a
		1455	nonretryable error occurred, C<0> when the download was partial and should
		1456	be retried, and C<1> if it was successful.
		1457
		1458	use AnyEvent::HTTP;
		1459
		1460	sub download($$$) {
		1461	my ($url, $file, $cb) = @_;
		1462
		1463	open my $fh, "+<", $file
		1464	or die "$file: $!";
		1465
		1466	my %hdr;
		1467	my $ofs = 0;
		1468
		1469	if (stat $fh and -s _) {
		1470	$ofs = -s _;
		1471	warn "-s is ", $ofs;
		1472	$hdr{"if-unmodified-since"} = AnyEvent::HTTP::format_date +(stat _)[9];
		1473	$hdr{"range"} = "bytes=$ofs-";
		1474	}
		1475
		1476	http_get $url,
		1477	headers => \%hdr,
		1478	on_header => sub {
		1479	my ($hdr) = @_;
		1480
		1481	if ($hdr->{Status} == 200 && $ofs) {
		1482	# resume failed
		1483	truncate $fh, $ofs = 0;
		1484	}
		1485
		1486	sysseek $fh, $ofs, 0;
		1487
		1488	1
		1489	},
		1490	on_body => sub {
		1491	my ($data, $hdr) = @_;
		1492
		1493	if ($hdr->{Status} =~ /^2/) {
		1494	length $data == syswrite $fh, $data
		1495	or return; # abort on write errors
		1496	}
		1497
		1498	1
		1499	},
		1500	sub {
		1501	my (undef, $hdr) = @_;
		1502
		1503	my $status = $hdr->{Status};
		1504
		1505	if (my $time = AnyEvent::HTTP::parse_date $hdr->{"last-modified"}) {
		1506	utime $time, $time, $fh;
		1507	}
		1508
		1509	if ($status == 200 || $status == 206 || $status == 416) {
		1510	# download ok || resume ok || file already fully downloaded
		1511	$cb->(1, $hdr);
		1512
		1513	} elsif ($status == 412) {
		1514	# file has changed while resuming, delete and retry
		1515	unlink $file;
		1516	$cb->(0, $hdr);
		1517
		1518	} elsif ($status == 500 or $status == 503 or $status =~ /^59/) {
		1519	# retry later
		1520	$cb->(0, $hdr);
		1521
		1522	} else {
		1523	$cb->(undef, $hdr);
		1524	}
		1525	}
		1526	;
		1527	}
		1528
		1529	download "http://server/somelargefile", "/tmp/somelargefile", sub {
		1530	if ($_[0]) {
		1531	print "OK!\n";
		1532	} elsif (defined $_[0]) {
		1533	print "please retry later\n";
		1534	} else {
		1535	print "ERROR\n";
		1536	}
		1537	};
		1538
913	=head2 SOCKS PROXIES	1539	=head3 SOCKS PROXIES
914		1540
915	Socks proxies are not directly supported by AnyEvent::HTTP. You can	1541	Socks proxies are not directly supported by AnyEvent::HTTP. You can
916	compile your perl to support socks, or use an external program such as	1542	compile your perl to support socks, or use an external program such as
917	F<socksify> (dante) or F<tsocks> to make your program use a socks proxy	1543	F<socksify> (dante) or F<tsocks> to make your program use a socks proxy
918	transparently.	1544	transparently.

Diff Legend

–	Removed lines
+	Added lines
<	Changed lines
>	Changed lines