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Comparing AnyEvent-HTTP/HTTP.pm (file contents):
Revision 1.77 by root, Sat Jan 1 19:13:41 2011 UTC vs.
Revision 1.138 by root, Fri Aug 5 20:45:09 2022 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 = 2.25;
53		52
54	our @EXPORT = qw(http_get http_post http_head http_request);	53	our @EXPORT = qw(http_get http_post http_head http_request);
55		54
56	our $USERAGENT = "Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)";	55	our $USERAGENT = "Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)";
57	our $MAX_RECURSE = 10;	56	our $MAX_RECURSE = 10;
58	our $MAX_PERSISTENT = 8;
59	our $PERSISTENT_TIMEOUT = 2;	57	our $PERSISTENT_TIMEOUT = 3;
60	our $TIMEOUT = 300;	58	our $TIMEOUT = 300;
61		59	our $MAX_PER_HOST = 4; # changing this is evil
62	# changing these is evil
63	our $MAX_PERSISTENT_PER_HOST = 0;
64	our $MAX_PER_HOST = 4;
65		60
66	our $PROXY;	61	our $PROXY;
67	our $ACTIVE = 0;	62	our $ACTIVE = 0;
68		63
69	my %KA_COUNT; # number of open keep-alive connections per host	64	my %KA_CACHE; # indexed by uhost currently, points to [$handle...] array
70	my %CO_SLOT; # number of open connections, and wait queue, per host	65	my %CO_SLOT; # number of open connections, and wait queue, per host
71		66
72	=item http_get $url, key => value..., $cb->($data, $headers)	67	=item http_get $url, key => value..., $cb->($data, $headers)
73		68
74	Executes an HTTP-GET request. See the http_request function for details on	69	Executes an HTTP-GET request. See the http_request function for details on
…		…
94	C<http_request> returns a "cancellation guard" - you have to keep the	89	C<http_request> returns a "cancellation guard" - you have to keep the
95	object at least alive until the callback get called. If the object gets	90	object at least alive until the callback get called. If the object gets
96	destroyed before the callback is called, the request will be cancelled.	91	destroyed before the callback is called, the request will be cancelled.
97		92
98	The callback will be called with the response body data as first argument	93	The callback will be called with the response body data as first argument
99	(or C<undef> if an error occured), and a hash-ref with response headers	94	(or C<undef> if an error occurred), and a hash-ref with response headers
100	(and trailers) as second argument.	95	(and trailers) as second argument.
101		96
102	All the headers in that hash are lowercased. In addition to the response	97	All the headers in that hash are lowercased. In addition to the response
103	headers, the "pseudo-headers" (uppercase to avoid clashing with possible	98	headers, the "pseudo-headers" (uppercase to avoid clashing with possible
104	response headers) C<HTTPVersion>, C<Status> and C<Reason> contain the	99	response headers) C<HTTPVersion>, C<Status> and C<Reason> contain the
…		…
128	C<590>-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. Currently the following status codes are used:	124	message. Currently the following status codes are used:
130		125
131	=over 4	126	=over 4
132		127
133	=item 595 - errors during connection etsbalishment, proxy handshake.	128	=item 595 - errors during connection establishment, proxy handshake.
134		129
135	=item 596 - errors during TLS negotiation, request sending and header processing.	130	=item 596 - errors during TLS negotiation, request sending and header processing.
136		131
137	=item 597 - errors during body receive or processing.	132	=item 597 - errors during body receiving or processing.
138		133
139	=item 598 - user aborted request in C<on_header> or C<on_body>.	134	=item 598 - user aborted request via C<on_header> or C<on_body>.
140		135
141	=item 599 - other, usually nonretryable, errors (garbled URL etc.).	136	=item 599 - other, usually nonretryable, errors (garbled URL etc.).
142		137
143	=back	138	=back
144		139
…		…
159		154
160	=over 4	155	=over 4
161		156
162	=item recurse => $count (default: $MAX_RECURSE)	157	=item recurse => $count (default: $MAX_RECURSE)
163		158
164	Whether to recurse requests or not, e.g. on redirects, authentication	159	Whether to recurse requests or not, e.g. on redirects, authentication and
165	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.
166		166
167	=item headers => hashref	167	=item headers => hashref
168		168
169	The request headers to use. Currently, C<http_request> may provide its own	169	The request headers to use. Currently, C<http_request> may provide its own
170	C<Host:>, C<Content-Length:>, C<Connection:> and C<Cookie:> headers and	170	C<Host:>, C<Content-Length:>, C<Connection:> and C<Cookie:> headers and
171	will provide defaults at least for C<TE:>, C<Referer:> and C<User-Agent:>	171	will provide defaults at least for C<TE:>, C<Referer:> and C<User-Agent:>
172	(this can be suppressed by using C<undef> for these headers in which case	172	(this can be suppressed by using C<undef> for these headers in which case
173	they won't be sent at all).	173	they won't be sent at all).
174		174
		175	You really should provide your own C<User-Agent:> header value that is
		176	appropriate for your program - I wouldn't be surprised if the default
		177	AnyEvent string gets blocked by webservers sooner or later.
		178
		179	Also, make sure that your headers names and values do not contain any
		180	embedded newlines.
		181
175	=item timeout => $seconds	182	=item timeout => $seconds
176		183
177	The time-out to use for various stages - each connect attempt will reset	184	The time-out to use for various stages - each connect attempt will reset
178	the timeout, as will read or write activity, i.e. this is not an overall	185	the timeout, as will read or write activity, i.e. this is not an overall
179	timeout.	186	timeout.
180		187
181	Default timeout is 5 minutes.	188	Default timeout is 5 minutes.
182		189
183	=item proxy => [$host, $port[, $scheme]] or undef	190	=item proxy => [$host, $port[, $scheme]] or undef
184		191
185	Use the given http proxy for all requests. If not specified, then the	192	Use the given http proxy for all requests, or no proxy if C<undef> is
186	default proxy (as specified by C<$ENV{http_proxy}>) is used.	193	used.
187		194
188	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.
189	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.
		202
		203	Note that this module will prefer an existing persistent connection,
		204	even if that connection was made using another proxy. If you need to
		205	ensure that a new connection is made in this case, you can either force
		206	C<persistent> to false or e.g. use the proxy address in your C<sessionid>.
190		207
191	=item body => $string	208	=item body => $string
192		209
193	The request body, usually empty. Will be sent as-is (future versions of	210	The request body, usually empty. Will be sent as-is (future versions of
194	this module might offer more options).	211	this module might offer more options).
…		…
196	=item cookie_jar => $hash_ref	213	=item cookie_jar => $hash_ref
197		214
198	Passing this parameter enables (simplified) cookie-processing, loosely	215	Passing this parameter enables (simplified) cookie-processing, loosely
199	based on the original netscape specification.	216	based on the original netscape specification.
200		217
201	The C<$hash_ref> must be an (initially empty) hash reference which will	218	The C<$hash_ref> must be an (initially empty) hash reference which
202	get updated automatically. It is possible to save the cookie jar to	219	will get updated automatically. It is possible to save the cookie jar
203	persistent storage with something like JSON or Storable, but this is not	220	to persistent storage with something like JSON or Storable - see the
204	recommended, as session-only cookies might survive longer than expected.	221	C<AnyEvent::HTTP::cookie_jar_expire> function if you wish to remove
		222	expired or session-only cookies, and also for documentation on the format
		223	of the cookie jar.
205		224
206	Note that this cookie implementation is not meant to be complete. If	225	Note that this cookie implementation is not meant to be complete. If
207	you want complete cookie management you have to do that on your	226	you want complete cookie management you have to do that on your
208	own. C<cookie_jar> is meant as a quick fix to get some cookie-using sites	227	own. C<cookie_jar> is meant as a quick fix to get most cookie-using sites
209	working. Cookies are a privacy disaster, do not use them unless required	228	working. Cookies are a privacy disaster, do not use them unless required
210	to.	229	to.
211		230
212	When cookie processing is enabled, the C<Cookie:> and C<Set-Cookie:>	231	When cookie processing is enabled, the C<Cookie:> and C<Set-Cookie:>
213	headers will be set and handled by this module, otherwise they will be	232	headers will be set and handled by this module, otherwise they will be
…		…
223	verification) TLS context.	242	verification) TLS context.
224		243
225	The default for this option is C<low>, which could be interpreted as "give	244	The default for this option is C<low>, which could be interpreted as "give
226	me the page, no matter what".	245	me the page, no matter what".
227		246
		247	See also the C<sessionid> parameter.
		248
		249	=item sessionid => $string
		250
		251	The module might reuse connections to the same host internally (regardless
		252	of other settings, such as C<tcp_connect> or C<proxy>). Sometimes (e.g.
		253	when using TLS or a specfic proxy), you do not want to reuse connections
		254	from other sessions. This can be achieved by setting this parameter to
		255	some unique ID (such as the address of an object storing your state data
		256	or the TLS context, or the proxy IP) - only connections using the same
		257	unique ID will be reused.
		258
228	=item on_prepare => $callback->($fh)	259	=item on_prepare => $callback->($fh)
229		260
230	In rare cases you need to "tune" the socket before it is used to	261	In rare cases you need to "tune" the socket before it is used to
231	connect (for exmaple, to bind it on a given IP address). This parameter	262	connect (for example, to bind it on a given IP address). This parameter
232	overrides the prepare callback passed to C<AnyEvent::Socket::tcp_connect>	263	overrides the prepare callback passed to C<AnyEvent::Socket::tcp_connect>
233	and behaves exactly the same way (e.g. it has to provide a	264	and behaves exactly the same way (e.g. it has to provide a
234	timeout). See the description for the C<$prepare_cb> argument of	265	timeout). See the description for the C<$prepare_cb> argument of
235	C<AnyEvent::Socket::tcp_connect> for details.	266	C<AnyEvent::Socket::tcp_connect> for details.
236		267
…		…
239	In even rarer cases you want total control over how AnyEvent::HTTP	270	In even rarer cases you want total control over how AnyEvent::HTTP
240	establishes connections. Normally it uses L<AnyEvent::Socket::tcp_connect>	271	establishes connections. Normally it uses L<AnyEvent::Socket::tcp_connect>
241	to do this, but you can provide your own C<tcp_connect> function -	272	to do this, but you can provide your own C<tcp_connect> function -
242	obviously, it has to follow the same calling conventions, except that it	273	obviously, it has to follow the same calling conventions, except that it
243	may always return a connection guard object.	274	may always return a connection guard object.
		275
		276	The connections made by this hook will be treated as equivalent to
		277	connections made the built-in way, specifically, they will be put into
		278	and taken from the persistent connection cache. If your C<$tcp_connect>
		279	function is incompatible with this kind of re-use, consider switching off
		280	C<persistent> connections and/or providing a C<sessionid> identifier.
244		281
245	There are probably lots of weird uses for this function, starting from	282	There are probably lots of weird uses for this function, starting from
246	tracing the hosts C<http_request> actually tries to connect, to (inexact	283	tracing the hosts C<http_request> actually tries to connect, to (inexact
247	but fast) host => IP address caching or even socks protocol support.	284	but fast) host => IP address caching or even socks protocol support.
248		285
…		…
301	called. Instead of the C<$body> argument containing the body data, the	338	called. Instead of the C<$body> argument containing the body data, the
302	callback will receive the L<AnyEvent::Handle> object associated with the	339	callback will receive the L<AnyEvent::Handle> object associated with the
303	connection. In error cases, C<undef> will be passed. When there is no body	340	connection. In error cases, C<undef> will be passed. When there is no body
304	(e.g. status C<304>), the empty string will be passed.	341	(e.g. status C<304>), the empty string will be passed.
305		342
306	The handle object might or might not be in TLS mode, might be connected to	343	The handle object might or might not be in TLS mode, might be connected
307	a proxy, be a persistent connection etc., and configured in unspecified	344	to a proxy, be a persistent connection, use chunked transfer encoding
308	ways. The user is responsible for this handle (it will not be used by this	345	etc., and configured in unspecified ways. The user is responsible for this
309	module anymore).	346	handle (it will not be used by this module anymore).
310		347
311	This is useful with some push-type services, where, after the initial	348	This is useful with some push-type services, where, after the initial
312	headers, an interactive protocol is used (typical example would be the	349	headers, an interactive protocol is used (typical example would be the
313	push-style twitter API which starts a JSON/XML stream).	350	push-style twitter API which starts a JSON/XML stream).
314		351
315	If you think you need this, first have a look at C<on_body>, to see if	352	If you think you need this, first have a look at C<on_body>, to see if
316	that doesn't solve your problem in a better way.	353	that doesn't solve your problem in a better way.
		354
		355	=item persistent => $boolean
		356
		357	Try to create/reuse a persistent connection. When this flag is set
		358	(default: true for idempotent requests, false for all others), then
		359	C<http_request> tries to re-use an existing (previously-created)
		360	persistent connection to same host (i.e. identical URL scheme, hostname,
		361	port and sessionid) and, failing that, tries to create a new one.
		362
		363	Requests failing in certain ways will be automatically retried once, which
		364	is dangerous for non-idempotent requests, which is why it defaults to off
		365	for them. The reason for this is because the bozos who designed HTTP/1.1
		366	made it impossible to distinguish between a fatal error and a normal
		367	connection timeout, so you never know whether there was a problem with
		368	your request or not.
		369
		370	When reusing an existent connection, many parameters (such as TLS context)
		371	will be ignored. See the C<sessionid> parameter for a workaround.
		372
		373	=item keepalive => $boolean
		374
		375	Only used when C<persistent> is also true. This parameter decides whether
		376	C<http_request> tries to handshake a HTTP/1.0-style keep-alive connection
		377	(as opposed to only a HTTP/1.1 persistent connection).
		378
		379	The default is true, except when using a proxy, in which case it defaults
		380	to false, as HTTP/1.0 proxies cannot support this in a meaningful way.
		381
		382	=item handle_params => { key => value ... }
		383
		384	The key-value pairs in this hash will be passed to any L<AnyEvent::Handle>
		385	constructor that is called - not all requests will create a handle, and
		386	sometimes more than one is created, so this parameter is only good for
		387	setting hints.
		388
		389	Example: set the maximum read size to 4096, to potentially conserve memory
		390	at the cost of speed.
		391
		392	handle_params => {
		393	max_read_size => 4096,
		394	},
317		395
318	=back	396	=back
319		397
320	Example: do a simple HTTP GET request for http://www.nethype.de/ and print	398	Example: do a simple HTTP GET request for http://www.nethype.de/ and print
321	the response body.	399	the response body.
…		…
327		405
328	Example: do a HTTP HEAD request on https://www.google.com/, use a	406	Example: do a HTTP HEAD request on https://www.google.com/, use a
329	timeout of 30 seconds.	407	timeout of 30 seconds.
330		408
331	http_request	409	http_request
332	GET => "https://www.google.com",	410	HEAD => "https://www.google.com",
		411	headers => { "user-agent" => "MySearchClient 1.0" },
333	timeout => 30,	412	timeout => 30,
334	sub {	413	sub {
335	my ($body, $hdr) = @_;	414	my ($body, $hdr) = @_;
336	use Data::Dumper;	415	use Data::Dumper;
337	print Dumper $hdr;	416	print Dumper $hdr;
…		…
347	};	426	};
348		427
349	undef $request;	428	undef $request;
350		429
351	=cut	430	=cut
		431
		432	#############################################################################
		433	# wait queue/slots
352		434
353	sub _slot_schedule;	435	sub _slot_schedule;
354	sub _slot_schedule($) {	436	sub _slot_schedule($) {
355	my $host = shift;	437	my $host = shift;
356		438
…		…
378	push @{ $CO_SLOT{$_[0]}[1] }, $_[1];	460	push @{ $CO_SLOT{$_[0]}[1] }, $_[1];
379		461
380	_slot_schedule $_[0];	462	_slot_schedule $_[0];
381	}	463	}
382		464
		465	#############################################################################
		466	# cookie handling
		467
		468	# expire cookies
		469	sub cookie_jar_expire($;$) {
		470	my ($jar, $session_end) = @_;
		471
		472	%$jar = () if $jar->{version} != 2;
		473
		474	my $anow = AE::now;
		475
		476	while (my ($chost, $paths) = each %$jar) {
		477	next unless ref $paths;
		478
		479	while (my ($cpath, $cookies) = each %$paths) {
		480	while (my ($cookie, $kv) = each %$cookies) {
		481	if (exists $kv->{_expires}) {
		482	delete $cookies->{$cookie}
		483	if $anow > $kv->{_expires};
		484	} elsif ($session_end) {
		485	delete $cookies->{$cookie};
		486	}
		487	}
		488
		489	delete $paths->{$cpath}
		490	unless %$cookies;
		491	}
		492
		493	delete $jar->{$chost}
		494	unless %$paths;
		495	}
		496	}
		497
383	# extract cookies from jar	498	# extract cookies from jar
384	sub cookie_jar_extract($$$$) {	499	sub cookie_jar_extract($$$$) {
385	my ($jar, $uscheme, $uhost, $upath) = @_;	500	my ($jar, $scheme, $host, $path) = @_;
386		501
387	%$jar = () if $jar->{version} != 1;	502	%$jar = () if $jar->{version} != 2;
		503
		504	$host = AnyEvent::Util::idn_to_ascii $host
		505	if $host =~ /[^\x00-\x7f]/;
388		506
389	my @cookies;	507	my @cookies;
390		508
391	while (my ($chost, $paths) = each %$jar) {	509	while (my ($chost, $paths) = each %$jar) {
392	next unless ref $paths;	510	next unless ref $paths;
393		511
394	if ($chost =~ /^\./) {	512	# exact match or suffix including . match
395	next unless $chost eq substr $uhost, -length $chost;	513	$chost eq $host or ".$chost" eq substr $host, -1 - length $chost
396	} elsif ($chost =~ /\./) {
397	next unless $chost eq $uhost;
398	} else {
399	next;	514	or next;
400	}
401		515
402	while (my ($cpath, $cookies) = each %$paths) {	516	while (my ($cpath, $cookies) = each %$paths) {
403	next unless $cpath eq substr $upath, 0, length $cpath;	517	next unless $cpath eq substr $path, 0, length $cpath;
404		518
405	while (my ($cookie, $kv) = each %$cookies) {	519	while (my ($cookie, $kv) = each %$cookies) {
406	next if $uscheme ne "https" && exists $kv->{secure};	520	next if $scheme ne "https" && exists $kv->{secure};
407		521
408	if (exists $kv->{expires}) {	522	if (exists $kv->{_expires} and AE::now > $kv->{_expires}) {
409	if (AE::now > parse_date ($kv->{expires})) {
410	delete $cookies->{$cookie};	523	delete $cookies->{$cookie};
411	next;	524	next;
412	}
413	}	525	}
414		526
415	my $value = $kv->{value};	527	my $value = $kv->{value};
416		528
417	if ($value =~ /[=;,[:space:]]/) {	529	if ($value =~ /[=;,[:space:]]/) {
…		…
426		538
427	\@cookies	539	\@cookies
428	}	540	}
429		541
430	# parse set_cookie header into jar	542	# parse set_cookie header into jar
431	sub cookie_jar_set_cookie($$$) {	543	sub cookie_jar_set_cookie($$$$) {
432	my ($jar, $set_cookie, $uhost) = @_;	544	my ($jar, $set_cookie, $host, $date) = @_;
		545
		546	%$jar = () if $jar->{version} != 2;
		547
		548	my $anow = int AE::now;
		549	my $snow; # server-now
433		550
434	for ($set_cookie) {	551	for ($set_cookie) {
435	# parse NAME=VALUE	552	# parse NAME=VALUE
436	my @kv;	553	my @kv;
437		554
		555	# expires is not http-compliant in the original cookie-spec,
		556	# we support the official date format and some extensions
438	while (	557	while (
439	m{	558	m{
440	\G\s*	559	\G\s*
441	(?:	560	(?:
442	expires \s*=\s* ([A-Z][a-z][a-z],\ [^,;]+)	561	expires \s*=\s* ([A-Z][a-z][a-z]+,\ [^,;]+)
443	| ([^=;,[:space:]]+) \s*=\s* (?: "((?:[^\\"]+|\\.)*)" | ([^=;,[:space:]]*) )	562	| ([^=;,[:space:]]+) (?: \s*=\s* (?: "((?:[^\\"]+|\\.)*)" | ([^;,[:space:]]*) ) )?
444	)	563	)
445	}gcxsi	564	}gcxsi
446	) {	565	) {
447	my $name = $2;	566	my $name = $2;
448	my $value = $4;	567	my $value = $4;
449		568
450	unless (defined $name) {	569	if (defined $1) {
451	# expires	570	# expires
452	$name = "expires";	571	$name = "expires";
453	$value = $1;	572	$value = $1;
454	} elsif (!defined $value) {	573	} elsif (defined $3) {
455	# quoted	574	# quoted
456	$value = $3;	575	$value = $3;
457	$value =~ s/\\(.)/$1/gs;	576	$value =~ s/\\(.)/$1/gs;
458	}	577	}
459		578
460	push @kv, lc $name, $value;	579	push @kv, @kv ? lc $name : $name, $value;
461		580
462	last unless /\G\s*;/gc;	581	last unless /\G\s*;/gc;
463	}	582	}
464		583
465	last unless @kv;	584	last unless @kv;
466		585
467	my $name = shift @kv;	586	my $name = shift @kv;
468	my %kv = (value => shift @kv, @kv);	587	my %kv = (value => shift @kv, @kv);
469		588
470	$kv{expires} ||= format_date (AE::now + $kv{"max-age"})
471	if exists $kv{"max-age"};	589	if (exists $kv{"max-age"}) {
		590	$kv{_expires} = $anow + delete $kv{"max-age"};
		591	} elsif (exists $kv{expires}) {
		592	$snow ||= parse_date ($date) || $anow;
		593	$kv{_expires} = $anow + (parse_date (delete $kv{expires}) - $snow);
		594	} else {
		595	delete $kv{_expires};
		596	}
472		597
473	my $cdom;	598	my $cdom;
474	my $cpath = (delete $kv{path}) || "/";	599	my $cpath = (delete $kv{path}) || "/";
475		600
476	if (exists $kv{domain}) {	601	if (exists $kv{domain}) {
477	$cdom = delete $kv{domain};	602	$cdom = $kv{domain};
478		603
479	$cdom =~ s/^\.?/./; # make sure it starts with a "."	604	$cdom =~ s/^\.?/./; # make sure it starts with a "."
480		605
481	next if $cdom =~ /\.$/;	606	next if $cdom =~ /\.$/;
482		607
483	# this is not rfc-like and not netscape-like. go figure.	608	# this is not rfc-like and not netscape-like. go figure.
484	my $ndots = $cdom =~ y/.//;	609	my $ndots = $cdom =~ y/.//;
485	next if $ndots < ($cdom =~ /\.[^.][^.]\.[^.][^.]$/ ? 3 : 2);	610	next if $ndots < ($cdom =~ /\.[^.][^.]\.[^.][^.]$/ ? 3 : 2);
		611
		612	$cdom = substr $cdom, 1; # remove initial .
486	} else {	613	} else {
487	$cdom = $uhost;	614	$cdom = $host;
488	}	615	}
489		616
490	# store it	617	# store it
491	$jar->{version} = 1;	618	$jar->{version} = 2;
492	$jar->{$cdom}{$cpath}{$name} = \%kv;	619	$jar->{lc $cdom}{$cpath}{$name} = \%kv;
493		620
494	redo if /\G\s*,/gc;	621	redo if /\G\s*,/gc;
495	}	622	}
496	}	623	}
497		624
		625	#############################################################################
		626	# keepalive/persistent connection cache
		627
		628	# fetch a connection from the keepalive cache
		629	sub ka_fetch($) {
		630	my $ka_key = shift;
		631
		632	my $hdl = pop @{ $KA_CACHE{$ka_key} }; # currently we reuse the MOST RECENTLY USED connection
		633	delete $KA_CACHE{$ka_key}
		634	unless @{ $KA_CACHE{$ka_key} };
		635
		636	$hdl
		637	}
		638
		639	sub ka_store($$) {
		640	my ($ka_key, $hdl) = @_;
		641
		642	my $kaa = $KA_CACHE{$ka_key} ||= [];
		643
		644	my $destroy = sub {
		645	my @ka = grep $_ != $hdl, @{ $KA_CACHE{$ka_key} };
		646
		647	$hdl->destroy;
		648
		649	@ka
		650	? $KA_CACHE{$ka_key} = \@ka
		651	: delete $KA_CACHE{$ka_key};
		652	};
		653
		654	# on error etc., destroy
		655	$hdl->on_error ($destroy);
		656	$hdl->on_eof ($destroy);
		657	$hdl->on_read ($destroy);
		658	$hdl->timeout ($PERSISTENT_TIMEOUT);
		659
		660	push @$kaa, $hdl;
		661	shift @$kaa while @$kaa > $MAX_PER_HOST;
		662	}
		663
		664	#############################################################################
		665	# utilities
		666
498	# continue to parse $_ for headers and place them into the arg	667	# continue to parse $_ for headers and place them into the arg
499	sub parse_hdr() {	668	sub _parse_hdr() {
500	my %hdr;	669	my %hdr;
501		670
502	# things seen, not parsed:	671	# things seen, not parsed:
503	# p3pP="NON CUR OTPi OUR NOR UNI"	672	# p3pP="NON CUR OTPi OUR NOR UNI"
504		673
…		…
518	for values %hdr;	687	for values %hdr;
519		688
520	\%hdr	689	\%hdr
521	}	690	}
522		691
		692	#############################################################################
		693	# http_get
		694
523	our $qr_nlnl = qr{(?<![^\012])\015?\012};	695	our $qr_nlnl = qr{(?<![^\012])\015?\012};
524		696
525	our $TLS_CTX_LOW = { cache => 1, sslv2 => 1 };	697	our $TLS_CTX_LOW = { cache => 1, sslv2 => 1 };
526	our $TLS_CTX_HIGH = { cache => 1, verify => 1, verify_peername => "https" };	698	our $TLS_CTX_HIGH = { cache => 1, verify => 1, verify_peername => "https" };
		699
		700	# maybe it should just become a normal object :/
		701
		702	sub _destroy_state(\%) {
		703	my ($state) = @_;
		704
		705	$state->{handle}->destroy if $state->{handle};
		706	%$state = ();
		707	}
		708
		709	sub _error(\%$$) {
		710	my ($state, $cb, $hdr) = @_;
		711
		712	&_destroy_state ($state);
		713
		714	$cb->(undef, $hdr);
		715	()
		716	}
		717
		718	our %IDEMPOTENT = (
		719	DELETE => 1,
		720	GET => 1,
		721	QUERY => 1,
		722	HEAD => 1,
		723	OPTIONS => 1,
		724	PUT => 1,
		725	TRACE => 1,
		726
		727	ACL => 1,
		728	"BASELINE-CONTROL" => 1,
		729	BIND => 1,
		730	CHECKIN => 1,
		731	CHECKOUT => 1,
		732	COPY => 1,
		733	LABEL => 1,
		734	LINK => 1,
		735	MERGE => 1,
		736	MKACTIVITY => 1,
		737	MKCALENDAR => 1,
		738	MKCOL => 1,
		739	MKREDIRECTREF => 1,
		740	MKWORKSPACE => 1,
		741	MOVE => 1,
		742	ORDERPATCH => 1,
		743	PROPFIND => 1,
		744	PROPPATCH => 1,
		745	REBIND => 1,
		746	REPORT => 1,
		747	SEARCH => 1,
		748	UNBIND => 1,
		749	UNCHECKOUT => 1,
		750	UNLINK => 1,
		751	UNLOCK => 1,
		752	UPDATE => 1,
		753	UPDATEREDIRECTREF => 1,
		754	"VERSION-CONTROL" => 1,
		755	);
527		756
528	sub http_request($$@) {	757	sub http_request($$@) {
529	my $cb = pop;	758	my $cb = pop;
530	my ($method, $url, %arg) = @_;	759	my ($method, $url, %arg) = @_;
531		760
…		…
549	my $recurse = exists $arg{recurse} ? delete $arg{recurse} : $MAX_RECURSE;	778	my $recurse = exists $arg{recurse} ? delete $arg{recurse} : $MAX_RECURSE;
550		779
551	return $cb->(undef, { @pseudo, Status => 599, Reason => "Too many redirections" })	780	return $cb->(undef, { @pseudo, Status => 599, Reason => "Too many redirections" })
552	if $recurse < 0;	781	if $recurse < 0;
553		782
554	my $proxy = $arg{proxy} || $PROXY;	783	my $proxy = exists $arg{proxy} ? $arg{proxy} : $PROXY;
555	my $timeout = $arg{timeout} || $TIMEOUT;	784	my $timeout = $arg{timeout} || $TIMEOUT;
556		785
557	my ($uscheme, $uauthority, $upath, $query, $fragment) =	786	my ($uscheme, $uauthority, $upath, $query, undef) = # ignore fragment
558	$url =~ m|(?:([^:/?#]+):)?(?://([^/?#]*))?([^?#]*)(?:(\?[^#]*))?(?:#(.*))?|;	787	$url =~ m|^([^:]+):(?://([^/?#]*))?([^?#]*)(?:(\?[^#]*))?(?:#(.*))?$|;
559		788
560	$uscheme = lc $uscheme;	789	$uscheme = lc $uscheme;
561		790
562	my $uport = $uscheme eq "http" ? 80	791	my $uport = $uscheme eq "http" ? 80
563	: $uscheme eq "https" ? 443	792	: $uscheme eq "https" ? 443
564	: return $cb->(undef, { @pseudo, Status => 599, Reason => "Only http and https URL schemes supported" });	793	: return $cb->(undef, { @pseudo, Status => 599, Reason => "Only http and https URL schemes supported" });
565		794
566	$uauthority =~ /^(?: .*\@ )? ([^\@:]+) (?: : (\d+) )?$/x	795	$uauthority =~ /^(?: .*\@ )? ([^\@]+?) (?: : (\d+) )?$/x
567	or return $cb->(undef, { @pseudo, Status => 599, Reason => "Unparsable URL" });	796	or return $cb->(undef, { @pseudo, Status => 599, Reason => "Unparsable URL" });
568		797
569	my $uhost = $1;	798	my $uhost = lc $1;
570	$uport = $2 if defined $2;	799	$uport = $2 if defined $2;
571		800
572	$hdr{host} = defined $2 ? "$uhost:$2" : "$uhost"	801	$hdr{host} = defined $2 ? "$uhost:$2" : "$uhost"
573	unless exists $hdr{host};	802	unless exists $hdr{host};
574		803
…		…
593	$rscheme = "http" unless defined $rscheme;	822	$rscheme = "http" unless defined $rscheme;
594		823
595	# don't support https requests over https-proxy transport,	824	# don't support https requests over https-proxy transport,
596	# can't be done with tls as spec'ed, unless you double-encrypt.	825	# can't be done with tls as spec'ed, unless you double-encrypt.
597	$rscheme = "http" if $uscheme eq "https" && $rscheme eq "https";	826	$rscheme = "http" if $uscheme eq "https" && $rscheme eq "https";
		827
		828	$rhost = lc $rhost;
		829	$rscheme = lc $rscheme;
598	} else {	830	} else {
599	($rhost, $rport, $rscheme, $rpath) = ($uhost, $uport, $uscheme, $upath);	831	($rhost, $rport, $rscheme, $rpath) = ($uhost, $uport, $uscheme, $upath);
600	}	832	}
601		833
602	# leave out fragment and query string, just a heuristic	834	# leave out fragment and query string, just a heuristic
…		…
604	$hdr{"user-agent"} = $USERAGENT unless exists $hdr{"user-agent"};	836	$hdr{"user-agent"} = $USERAGENT unless exists $hdr{"user-agent"};
605		837
606	$hdr{"content-length"} = length $arg{body}	838	$hdr{"content-length"} = length $arg{body}
607	if length $arg{body} || $method ne "GET";	839	if length $arg{body} || $method ne "GET";
608		840
609	$hdr{connection} = "close TE"; #1.1	841	my $idempotent = $IDEMPOTENT{$method};
		842
		843	# default value for keepalive is true iff the request is for an idempotent method
		844	my $persistent = exists $arg{persistent} ? !!$arg{persistent} : $idempotent;
		845	my $keepalive = exists $arg{keepalive} ? !!$arg{keepalive} : !$proxy;
		846	my $was_persistent; # true if this is actually a recycled connection
		847
		848	# the key to use in the keepalive cache
		849	my $ka_key = "$uscheme\x00$uhost\x00$uport\x00$arg{sessionid}";
		850
		851	$hdr{connection} = ($persistent ? $keepalive ? "keep-alive, " : "" : "close, ") . "Te"; #1.1
610	$hdr{te} = "trailers" unless exists $hdr{te}; #1.1	852	$hdr{te} = "trailers" unless exists $hdr{te}; #1.1
611		853
612	my %state = (connect_guard => 1);	854	my %state = (connect_guard => 1);
		855
		856	my $ae_error = 595; # connecting
		857
		858	# handle actual, non-tunneled, request
		859	my $handle_actual_request = sub {
		860	$ae_error = 596; # request phase
		861
		862	my $hdl = $state{handle};
		863
		864	$hdl->starttls ("connect") if $uscheme eq "https" && !exists $hdl->{tls};
		865
		866	# send request
		867	$hdl->push_write (
		868	"$method $rpath HTTP/1.1\015\012"
		869	. (join "", map "\u$_: $hdr{$_}\015\012", grep defined $hdr{$_}, keys %hdr)
		870	. "\015\012"
		871	. $arg{body}
		872	);
		873
		874	# return if error occurred during push_write()
		875	return unless %state;
		876
		877	# reduce memory usage, save a kitten, also re-use it for the response headers.
		878	%hdr = ();
		879
		880	# status line and headers
		881	$state{read_response} = sub {
		882	return unless %state;
		883
		884	for ("$_[1]") {
		885	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
		886
		887	/^HTTP\/0*([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\012]*) )? \012/gxci
		888	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Invalid server response" };
		889
		890	# 100 Continue handling
		891	# should not happen as we don't send expect: 100-continue,
		892	# but we handle it just in case.
		893	# since we send the request body regardless, if we get an error
		894	# we are out of-sync, which we currently do NOT handle correctly.
		895	return $state{handle}->push_read (line => $qr_nlnl, $state{read_response})
		896	if $2 eq 100;
		897
		898	push @pseudo,
		899	HTTPVersion => $1,
		900	Status => $2,
		901	Reason => $3,
		902	;
		903
		904	my $hdr = _parse_hdr
		905	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Garbled response headers" };
		906
		907	%hdr = (%$hdr, @pseudo);
		908	}
		909
		910	# redirect handling
		911	# relative uri handling forced by microsoft and other shitheads.
		912	# we give our best and fall back to URI if available.
		913	if (exists $hdr{location}) {
		914	my $loc = $hdr{location};
		915
		916	if ($loc =~ m%^//%) { # //
		917	$loc = "$uscheme:$loc";
		918
		919	} elsif ($loc eq "") {
		920	$loc = $url;
		921
		922	} elsif ($loc !~ /^(?: $ | [^:\/?\#]+ : )/x) { # anything "simple"
		923	$loc =~ s/^\.\/+//;
		924
		925	if ($loc !~ m%^[.?#]%) {
		926	my $prefix = "$uscheme://$uauthority";
		927
		928	unless ($loc =~ s/^\///) {
		929	$prefix .= $upath;
		930	$prefix =~ s/\/[^\/]*$//;
		931	}
		932
		933	$loc = "$prefix/$loc";
		934
		935	} elsif (eval { require URI }) { # uri
		936	$loc = URI->new_abs ($loc, $url)->as_string;
		937
		938	} else {
		939	return _error %state, $cb, { @pseudo, Status => 599, Reason => "Cannot parse Location (URI module missing)" };
		940	#$hdr{Status} = 599;
		941	#$hdr{Reason} = "Unparsable Redirect (URI module missing)";
		942	#$recurse = 0;
		943	}
		944	}
		945
		946	$hdr{location} = $loc;
		947	}
		948
		949	my $redirect;
		950
		951	if ($recurse) {
		952	my $status = $hdr{Status};
		953
		954	# industry standard is to redirect POST as GET for
		955	# 301, 302 and 303, in contrast to HTTP/1.0 and 1.1.
		956	# also, the UA should ask the user for 301 and 307 and POST,
		957	# industry standard seems to be to simply follow.
		958	# we go with the industry standard. 308 is defined
		959	# by rfc7538
		960	if ($status == 301 or $status == 302 or $status == 303) {
		961	$redirect = 1;
		962	# HTTP/1.1 is unclear on how to mutate the method
		963	unless ($method eq "HEAD") {
		964	$method = "GET";
		965	delete $arg{body};
		966	}
		967	} elsif ($status == 307 or $status == 308) {
		968	$redirect = 1;
		969	}
		970	}
		971
		972	my $finish = sub { # ($data, $err_status, $err_reason[, $persistent])
		973	if ($state{handle}) {
		974	# handle keepalive
		975	if (
		976	$persistent
		977	&& $_[3]
		978	&& ($hdr{HTTPVersion} < 1.1
		979	? $hdr{connection} =~ /\bkeep-?alive\b/i
		980	: $hdr{connection} !~ /\bclose\b/i)
		981	) {
		982	ka_store $ka_key, delete $state{handle};
		983	} else {
		984	# no keepalive, destroy the handle
		985	$state{handle}->destroy;
		986	}
		987	}
		988
		989	%state = ();
		990
		991	if (defined $_[1]) {
		992	$hdr{OrigStatus} = $hdr{Status}; $hdr{Status} = $_[1];
		993	$hdr{OrigReason} = $hdr{Reason}; $hdr{Reason} = $_[2];
		994	}
		995
		996	# set-cookie processing
		997	if ($arg{cookie_jar}) {
		998	cookie_jar_set_cookie $arg{cookie_jar}, $hdr{"set-cookie"}, $uhost, $hdr{date};
		999	}
		1000
		1001	if ($redirect && exists $hdr{location}) {
		1002	# we ignore any errors, as it is very common to receive
		1003	# Content-Length != 0 but no actual body
		1004	# we also access %hdr, as $_[1] might be an erro
		1005	$state{recurse} =
		1006	http_request (
		1007	$method => $hdr{location},
		1008	%arg,
		1009	recurse => $recurse - 1,
		1010	Redirect => [$_[0], \%hdr],
		1011	sub {
		1012	%state = ();
		1013	&$cb
		1014	},
		1015	);
		1016	} else {
		1017	$cb->($_[0], \%hdr);
		1018	}
		1019	};
		1020
		1021	$ae_error = 597; # body phase
		1022
		1023	my $chunked = $hdr{"transfer-encoding"} =~ /\bchunked\b/i; # not quite correct...
		1024
		1025	my $len = $chunked ? undef : $hdr{"content-length"};
		1026
		1027	# body handling, many different code paths
		1028	# - no body expected
		1029	# - want_body_handle
		1030	# - te chunked
		1031	# - 2x length known (with or without on_body)
		1032	# - 2x length not known (with or without on_body)
		1033	if (!$redirect && $arg{on_header} && !$arg{on_header}(\%hdr)) {
		1034	$finish->(undef, 598 => "Request cancelled by on_header");
		1035	} elsif (
		1036	$hdr{Status} =~ /^(?:1..|204|205|304)$/
		1037	or $method eq "HEAD"
		1038	or (defined $len && $len == 0) # == 0, not !, because "0 " is true
		1039	) {
		1040	# no body
		1041	$finish->("", undef, undef, 1);
		1042
		1043	} elsif (!$redirect && $arg{want_body_handle}) {
		1044	$_[0]->on_eof (undef);
		1045	$_[0]->on_error (undef);
		1046	$_[0]->on_read (undef);
		1047
		1048	$finish->(delete $state{handle});
		1049
		1050	} elsif ($chunked) {
		1051	my $cl = 0;
		1052	my $body = "";
		1053	my $on_body = (!$redirect && $arg{on_body}) || sub { $body .= shift; 1 };
		1054
		1055	$state{read_chunk} = sub {
		1056	$_[1] =~ /^([0-9a-fA-F]+)/
		1057	or return $finish->(undef, $ae_error => "Garbled chunked transfer encoding");
		1058
		1059	my $len = hex $1;
		1060
		1061	if ($len) {
		1062	$cl += $len;
		1063
		1064	$_[0]->push_read (chunk => $len, sub {
		1065	$on_body->($_[1], \%hdr)
		1066	or return $finish->(undef, 598 => "Request cancelled by on_body");
		1067
		1068	$_[0]->push_read (line => sub {
		1069	length $_[1]
		1070	and return $finish->(undef, $ae_error => "Garbled chunked transfer encoding");
		1071	$_[0]->push_read (line => $state{read_chunk});
		1072	});
		1073	});
		1074	} else {
		1075	$hdr{"content-length"} ||= $cl;
		1076
		1077	$_[0]->push_read (line => $qr_nlnl, sub {
		1078	if (length $_[1]) {
		1079	for ("$_[1]") {
		1080	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
		1081
		1082	my $hdr = _parse_hdr
		1083	or return $finish->(undef, $ae_error => "Garbled response trailers");
		1084
		1085	%hdr = (%hdr, %$hdr);
		1086	}
		1087	}
		1088
		1089	$finish->($body, undef, undef, 1);
		1090	});
		1091	}
		1092	};
		1093
		1094	$_[0]->push_read (line => $state{read_chunk});
		1095
		1096	} elsif (!$redirect && $arg{on_body}) {
		1097	if (defined $len) {
		1098	$_[0]->on_read (sub {
		1099	$len -= length $_[0]{rbuf};
		1100
		1101	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
		1102	or return $finish->(undef, 598 => "Request cancelled by on_body");
		1103
		1104	$len > 0
		1105	or $finish->("", undef, undef, 1);
		1106	});
		1107	} else {
		1108	$_[0]->on_eof (sub {
		1109	$finish->("");
		1110	});
		1111	$_[0]->on_read (sub {
		1112	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
		1113	or $finish->(undef, 598 => "Request cancelled by on_body");
		1114	});
		1115	}
		1116	} else {
		1117	$_[0]->on_eof (undef);
		1118
		1119	if (defined $len) {
		1120	$_[0]->on_read (sub {
		1121	$finish->((substr delete $_[0]{rbuf}, 0, $len, ""), undef, undef, 1)
		1122	if $len <= length $_[0]{rbuf};
		1123	});
		1124	} else {
		1125	$_[0]->on_error (sub {
		1126	($! == Errno::EPIPE || !$!)
		1127	? $finish->(delete $_[0]{rbuf})
		1128	: $finish->(undef, $ae_error => $_[2]);
		1129	});
		1130	$_[0]->on_read (sub { });
		1131	}
		1132	}
		1133	};
		1134
		1135	# if keepalive is enabled, then the server closing the connection
		1136	# before a response can happen legally - we retry on idempotent methods.
		1137	if ($was_persistent && $idempotent) {
		1138	my $old_eof = $hdl->{on_eof};
		1139	$hdl->{on_eof} = sub {
		1140	_destroy_state %state;
		1141
		1142	%state = ();
		1143	$state{recurse} =
		1144	http_request (
		1145	$method => $url,
		1146	%arg,
		1147	recurse => $recurse - 1,
		1148	persistent => 0,
		1149	sub {
		1150	%state = ();
		1151	&$cb
		1152	}
		1153	);
		1154	};
		1155	$hdl->on_read (sub {
		1156	return unless %state;
		1157
		1158	# as soon as we receive something, a connection close
		1159	# once more becomes a hard error
		1160	$hdl->{on_eof} = $old_eof;
		1161	$hdl->push_read (line => $qr_nlnl, $state{read_response});
		1162	});
		1163	} else {
		1164	$hdl->push_read (line => $qr_nlnl, $state{read_response});
		1165	}
		1166	};
		1167
		1168	my $prepare_handle = sub {
		1169	my ($hdl) = $state{handle};
		1170
		1171	$hdl->on_error (sub {
		1172	_error %state, $cb, { @pseudo, Status => $ae_error, Reason => $_[2] };
		1173	});
		1174	$hdl->on_eof (sub {
		1175	_error %state, $cb, { @pseudo, Status => $ae_error, Reason => "Unexpected end-of-file" };
		1176	});
		1177	$hdl->timeout_reset;
		1178	$hdl->timeout ($timeout);
		1179	};
		1180
		1181	# connected to proxy (or origin server)
		1182	my $connect_cb = sub {
		1183	my $fh = shift
		1184	or return _error %state, $cb, { @pseudo, Status => $ae_error, Reason => "$!" };
		1185
		1186	return unless delete $state{connect_guard};
		1187
		1188	# get handle
		1189	$state{handle} = new AnyEvent::Handle
		1190	%{ $arg{handle_params} },
		1191	fh => $fh,
		1192	peername => $uhost,
		1193	tls_ctx => $arg{tls_ctx},
		1194	;
		1195
		1196	$prepare_handle->();
		1197
		1198	#$state{handle}->starttls ("connect") if $rscheme eq "https";
		1199
		1200	# now handle proxy-CONNECT method
		1201	if ($proxy && $uscheme eq "https") {
		1202	# oh dear, we have to wrap it into a connect request
		1203
		1204	my $auth = exists $hdr{"proxy-authorization"}
		1205	? "proxy-authorization: " . (delete $hdr{"proxy-authorization"}) . "\015\012"
		1206	: "";
		1207
		1208	# maybe re-use $uauthority with patched port?
		1209	$state{handle}->push_write ("CONNECT $uhost:$uport HTTP/1.0\015\012$auth\015\012");
		1210	$state{handle}->push_read (line => $qr_nlnl, sub {
		1211	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix
		1212	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Invalid proxy connect response ($_[1])" };
		1213
		1214	if ($2 == 200) {
		1215	$rpath = $upath;
		1216	$handle_actual_request->();
		1217	} else {
		1218	_error %state, $cb, { @pseudo, Status => $2, Reason => $3 };
		1219	}
		1220	});
		1221	} else {
		1222	delete $hdr{"proxy-authorization"} unless $proxy;
		1223
		1224	$handle_actual_request->();
		1225	}
		1226	};
613		1227
614	_get_slot $uhost, sub {	1228	_get_slot $uhost, sub {
615	$state{slot_guard} = shift;	1229	$state{slot_guard} = shift;
616		1230
617	return unless $state{connect_guard};	1231	return unless $state{connect_guard};
618		1232
619	my $ae_error = 595; # connecting	1233	# try to use an existing keepalive connection, but only if we, ourselves, plan
		1234	# on a keepalive request (in theory, this should be a separate config option).
		1235	if ($persistent && $KA_CACHE{$ka_key}) {
		1236	$was_persistent = 1;
620		1237
621	my $connect_cb = sub {	1238	$state{handle} = ka_fetch $ka_key;
622	$state{fh} = shift	1239	# $state{handle}->destroyed
623	or do {	1240	# and die "AnyEvent::HTTP: unexpectedly got a destructed handle (1), please report.";#d#
624	my $err = "$!";	1241	$prepare_handle->();
625	%state = ();	1242	# $state{handle}->destroyed
626	return $cb->(undef, { @pseudo, Status => $ae_error, Reason => $err });	1243	# and die "AnyEvent::HTTP: unexpectedly got a destructed handle (2), please report.";#d#
627	};
628
629	return unless delete $state{connect_guard};
630
631	# get handle
632	$state{handle} = new AnyEvent::Handle
633	fh => $state{fh},
634	peername => $rhost,
635	tls_ctx => $arg{tls_ctx},
636	# these need to be reconfigured on keepalive handles
637	timeout => $timeout,
638	on_error => sub {
639	%state = ();
640	$cb->(undef, { @pseudo, Status => $ae_error, Reason => $_[2] });
641	},
642	on_eof => sub {
643	%state = ();
644	$cb->(undef, { @pseudo, Status => $ae_error, Reason => "Unexpected end-of-file" });
645	},
646	;
647
648	# limit the number of persistent connections
649	# keepalive not yet supported
650	# if ($KA_COUNT{$_[1]} < $MAX_PERSISTENT_PER_HOST) {
651	# ++$KA_COUNT{$_[1]};
652	# $state{handle}{ka_count_guard} = AnyEvent::Util::guard {
653	# --$KA_COUNT{$_[1]}
654	# };
655	# $hdr{connection} = "keep-alive";
656	# }
657
658	$state{handle}->starttls ("connect") if $rscheme eq "https";
659
660	# handle actual, non-tunneled, request
661	my $handle_actual_request = sub {
662	$ae_error = 596; # request phase
663
664	$state{handle}->starttls ("connect") if $uscheme eq "https" && !exists $state{handle}{tls};
665
666	# send request
667	$state{handle}->push_write (
668	"$method $rpath HTTP/1.1\015\012"
669	. (join "", map "\u$_: $hdr{$_}\015\012", grep defined $hdr{$_}, keys %hdr)
670	. "\015\012"
671	. (delete $arg{body})
672	);
673
674	# return if error occured during push_write()
675	return unless %state;
676
677	%hdr = (); # reduce memory usage, save a kitten, also make it possible to re-use
678
679	# status line and headers
680	$state{read_response} = sub {
681	for ("$_[1]") {
682	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
683
684	/^HTTP\/0*([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\012]*) )? \012/gxci
685	or return (%state = (), $cb->(undef, { @pseudo, Status => 599, Reason => "Invalid server response" }));
686
687	# 100 Continue handling
688	# should not happen as we don't send expect: 100-continue,
689	# but we handle it just in case.
690	# since we send the request body regardless, if we get an error
691	# we are out of-sync, which we currently do NOT handle correctly.
692	return $state{handle}->push_read (line => $qr_nlnl, $state{read_response})
693	if $2 eq 100;
694
695	push @pseudo,
696	HTTPVersion => $1,
697	Status => $2,
698	Reason => $3,
699	;
700
701	my $hdr = parse_hdr
702	or return (%state = (), $cb->(undef, { @pseudo, Status => 599, Reason => "Garbled response headers" }));
703
704	%hdr = (%$hdr, @pseudo);
705	}
706
707	# redirect handling
708	# microsoft and other shitheads don't give a shit for following standards,
709	# try to support some common forms of broken Location headers.
710	if ($hdr{location} !~ /^(?: $ | [^:\/?\#]+ : )/x) {
711	$hdr{location} =~ s/^\.\/+//;
712
713	my $url = "$rscheme://$uhost:$uport";
714
715	unless ($hdr{location} =~ s/^\///) {
716	$url .= $upath;
717	$url =~ s/\/[^\/]*$//;
718	}
719
720	$hdr{location} = "$url/$hdr{location}";
721	}
722
723	my $redirect;
724
725	if ($recurse) {
726	my $status = $hdr{Status};
727
728	# industry standard is to redirect POST as GET for
729	# 301, 302 and 303, in contrast to HTTP/1.0 and 1.1.
730	# also, the UA should ask the user for 301 and 307 and POST,
731	# industry standard seems to be to simply follow.
732	# we go with the industry standard.
733	if ($status == 301 or $status == 302 or $status == 303) {
734	# HTTP/1.1 is unclear on how to mutate the method
735	$method = "GET" unless $method eq "HEAD";
736	$redirect = 1;
737	} elsif ($status == 307) {
738	$redirect = 1;
739	}
740	}
741
742	my $finish = sub { # ($data, $err_status, $err_reason[, $keepalive])
743	my $may_keep_alive = $_[3];
744
745	$state{handle}->destroy if $state{handle};
746	%state = ();
747
748	if (defined $_[1]) {
749	$hdr{OrigStatus} = $hdr{Status}; $hdr{Status} = $_[1];
750	$hdr{OrigReason} = $hdr{Reason}; $hdr{Reason} = $_[2];
751	}
752
753	# set-cookie processing
754	if ($arg{cookie_jar}) {
755	cookie_jar_set_cookie $arg{cookie_jar}, $hdr{"set-cookie"}, $uhost;
756	}
757
758	if ($redirect && exists $hdr{location}) {
759	# we ignore any errors, as it is very common to receive
760	# Content-Length != 0 but no actual body
761	# we also access %hdr, as $_[1] might be an erro
762	http_request (
763	$method => $hdr{location},
764	%arg,
765	recurse => $recurse - 1,
766	Redirect => [$_[0], \%hdr],
767	$cb);
768	} else {
769	$cb->($_[0], \%hdr);
770	}
771	};
772
773	$ae_error = 597; # body phase
774
775	my $len = $hdr{"content-length"};
776
777	if (!$redirect && $arg{on_header} && !$arg{on_header}(\%hdr)) {
778	$finish->(undef, 598 => "Request cancelled by on_header");
779	} elsif (
780	$hdr{Status} =~ /^(?:1..|204|205|304)$/
781	or $method eq "HEAD"
782	or (defined $len && !$len)
783	) {
784	# no body
785	$finish->("", undef, undef, 1);
786	} else {
787	# body handling, many different code paths
788	# - no body expected
789	# - want_body_handle
790	# - te chunked
791	# - 2x length known (with or without on_body)
792	# - 2x length not known (with or without on_body)
793	if (!$redirect && $arg{want_body_handle}) {
794	$_[0]->on_eof (undef);
795	$_[0]->on_error (undef);
796	$_[0]->on_read (undef);
797
798	$finish->(delete $state{handle});
799
800	} elsif ($hdr{"transfer-encoding"} =~ /\bchunked\b/i) {
801	my $cl = 0;
802	my $body = undef;
803	my $on_body = $arg{on_body} || sub { $body .= shift; 1 };
804
805	my $read_chunk; $read_chunk = sub {
806	$_[1] =~ /^([0-9a-fA-F]+)/
807	or $finish->(undef, $ae_error => "Garbled chunked transfer encoding");
808
809	my $len = hex $1;
810
811	if ($len) {
812	$cl += $len;
813
814	$_[0]->push_read (chunk => $len, sub {
815	$on_body->($_[1], \%hdr)
816	or return $finish->(undef, 598 => "Request cancelled by on_body");
817
818	$_[0]->push_read (line => sub {
819	length $_[1]
820	and return $finish->(undef, $ae_error => "Garbled chunked transfer encoding");
821	$_[0]->push_read (line => $read_chunk);
822	});
823	});
824	} else {
825	$hdr{"content-length"} ||= $cl;
826
827	$_[0]->push_read (line => $qr_nlnl, sub {
828	if (length $_[1]) {
829	for ("$_[1]") {
830	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
831
832	my $hdr = parse_hdr
833	or return $finish->(undef, $ae_error => "Garbled response trailers");
834
835	%hdr = (%hdr, %$hdr);
836	}
837	}
838
839	$finish->($body, undef, undef, 1);
840	});
841	}
842	};
843
844	$_[0]->push_read (line => $read_chunk);
845
846	} elsif ($arg{on_body}) {
847	if ($len) {
848	$_[0]->on_read (sub {
849	$len -= length $_[0]{rbuf};
850
851	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
852	or return $finish->(undef, 598 => "Request cancelled by on_body");
853
854	$len > 0
855	or $finish->("", undef, undef, 1);
856	});
857	} else {
858	$_[0]->on_eof (sub {
859	$finish->("");
860	});
861	$_[0]->on_read (sub {
862	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
863	or $finish->(undef, 598 => "Request cancelled by on_body");
864	});
865	}
866	} else {
867	$_[0]->on_eof (undef);
868
869	if ($len) {
870	$_[0]->on_read (sub {
871	$finish->((substr delete $_[0]{rbuf}, 0, $len, ""), undef, undef, 1)
872	if $len <= length $_[0]{rbuf};
873	});
874	} else {
875	$_[0]->on_error (sub {
876	($! == Errno::EPIPE || !$!)
877	? $finish->(delete $_[0]{rbuf})
878	: $finish->(undef, $ae_error => $_[2]);
879	});
880	$_[0]->on_read (sub { });
881	}
882	}
883	}
884	};
885
886	$state{handle}->push_read (line => $qr_nlnl, $state{read_response});
887	};
888
889	# now handle proxy-CONNECT method
890	if ($proxy && $uscheme eq "https") {
891	# oh dear, we have to wrap it into a connect request
892
893	# maybe re-use $uauthority with patched port?
894	$state{handle}->push_write ("CONNECT $uhost:$uport HTTP/1.0\015\012Host: $uhost\015\012\015\012");
895	$state{handle}->push_read (line => $qr_nlnl, sub {
896	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix
897	or return (%state = (), $cb->(undef, { @pseudo, Status => 599, Reason => "Invalid proxy connect response ($_[1])" }));
898
899	if ($2 == 200) {
900	$rpath = $upath;	1244	$rpath = $upath;
901	&$handle_actual_request;	1245	$handle_actual_request->();
902	} else {	1246
903	%state = ();
904	$cb->(undef, { @pseudo, Status => $2, Reason => $3 });
905	}
906	});
907	} else {	1247	} else {
908	&$handle_actual_request;
909	}
910	};
911
912	my $tcp_connect = $arg{tcp_connect}	1248	my $tcp_connect = $arg{tcp_connect}
913	|| do { require AnyEvent::Socket; \&AnyEvent::Socket::tcp_connect };	1249	|| do { require AnyEvent::Socket; \&AnyEvent::Socket::tcp_connect };
914		1250
915	$state{connect_guard} = $tcp_connect->($rhost, $rport, $connect_cb, $arg{on_prepare} || sub { $timeout });	1251	$state{connect_guard} = $tcp_connect->($rhost, $rport, $connect_cb, $arg{on_prepare} || sub { $timeout });
916		1252	}
917	};	1253	};
918		1254
919	defined wantarray && AnyEvent::Util::guard { %state = () }	1255	defined wantarray && AnyEvent::Util::guard { _destroy_state %state }
920	}	1256	}
921		1257
922	sub http_get($@) {	1258	sub http_get($@) {
923	unshift @_, "GET";	1259	unshift @_, "GET";
924	&http_request	1260	&http_request
…		…
942	AnyEvent::HTTP uses the AnyEvent::Socket::tcp_connect function for	1278	AnyEvent::HTTP uses the AnyEvent::Socket::tcp_connect function for
943	the actual connection, which in turn uses AnyEvent::DNS to resolve	1279	the actual connection, which in turn uses AnyEvent::DNS to resolve
944	hostnames. The latter is a simple stub resolver and does no caching	1280	hostnames. The latter is a simple stub resolver and does no caching
945	on its own. If you want DNS caching, you currently have to provide	1281	on its own. If you want DNS caching, you currently have to provide
946	your own default resolver (by storing a suitable resolver object in	1282	your own default resolver (by storing a suitable resolver object in
947	C<$AnyEvent::DNS::RESOLVER>).	1283	C<$AnyEvent::DNS::RESOLVER>) or your own C<tcp_connect> callback.
948		1284
949	=head2 GLOBAL FUNCTIONS AND VARIABLES	1285	=head2 GLOBAL FUNCTIONS AND VARIABLES
950		1286
951	=over 4	1287	=over 4
952		1288
953	=item AnyEvent::HTTP::set_proxy "proxy-url"	1289	=item AnyEvent::HTTP::set_proxy "proxy-url"
954		1290
955	Sets the default proxy server to use. The proxy-url must begin with a	1291	Sets the default proxy server to use. The proxy-url must begin with a
956	string of the form C<http://host:port> (optionally C<https:...>), croaks	1292	string of the form C<http://host:port>, croaks otherwise.
957	otherwise.
958		1293
959	To clear an already-set proxy, use C<undef>.	1294	To clear an already-set proxy, use C<undef>.
		1295
		1296	When AnyEvent::HTTP is loaded for the first time it will query the
		1297	default proxy from the operating system, currently by looking at
		1298	C<$ENV{http_proxy>}.
		1299
		1300	=item AnyEvent::HTTP::cookie_jar_expire $jar[, $session_end]
		1301
		1302	Remove all cookies from the cookie jar that have been expired. If
		1303	C<$session_end> is given and true, then additionally remove all session
		1304	cookies.
		1305
		1306	You should call this function (with a true C<$session_end>) before you
		1307	save cookies to disk, and you should call this function after loading them
		1308	again. If you have a long-running program you can additionally call this
		1309	function from time to time.
		1310
		1311	A cookie jar is initially an empty hash-reference that is managed by this
		1312	module. Its format is subject to change, but currently it is as follows:
		1313
		1314	The key C<version> has to contain C<2>, otherwise the hash gets
		1315	cleared. All other keys are hostnames or IP addresses pointing to
		1316	hash-references. The key for these inner hash references is the
		1317	server path for which this cookie is meant, and the values are again
		1318	hash-references. Each key of those hash-references is a cookie name, and
		1319	the value, you guessed it, is another hash-reference, this time with the
		1320	key-value pairs from the cookie, except for C<expires> and C<max-age>,
		1321	which have been replaced by a C<_expires> key that contains the cookie
		1322	expiry timestamp. Session cookies are indicated by not having an
		1323	C<_expires> key.
		1324
		1325	Here is an example of a cookie jar with a single cookie, so you have a
		1326	chance of understanding the above paragraph:
		1327
		1328	{
		1329	version => 2,
		1330	"10.0.0.1" => {
		1331	"/" => {
		1332	"mythweb_id" => {
		1333	_expires => 1293917923,
		1334	value => "ooRung9dThee3ooyXooM1Ohm",
		1335	},
		1336	},
		1337	},
		1338	}
960		1339
961	=item $date = AnyEvent::HTTP::format_date $timestamp	1340	=item $date = AnyEvent::HTTP::format_date $timestamp
962		1341
963	Takes a POSIX timestamp (seconds since the epoch) and formats it as a HTTP	1342	Takes a POSIX timestamp (seconds since the epoch) and formats it as a HTTP
964	Date (RFC 2616).	1343	Date (RFC 2616).
965		1344
966	=item $timestamp = AnyEvent::HTTP::parse_date $date	1345	=item $timestamp = AnyEvent::HTTP::parse_date $date
967		1346
968	Takes a HTTP Date (RFC 2616) or a Cookie date (netscape cookie spec) and	1347	Takes a HTTP Date (RFC 2616) or a Cookie date (netscape cookie spec) or a
969	returns the corresponding POSIX timestamp, or C<undef> if the date cannot	1348	bunch of minor variations of those, and returns the corresponding POSIX
970	be parsed.	1349	timestamp, or C<undef> if the date cannot be parsed.
971		1350
972	=item $AnyEvent::HTTP::MAX_RECURSE	1351	=item $AnyEvent::HTTP::MAX_RECURSE
973		1352
974	The default value for the C<recurse> request parameter (default: C<10>).	1353	The default value for the C<recurse> request parameter (default: C<10>).
		1354
		1355	=item $AnyEvent::HTTP::TIMEOUT
		1356
		1357	The default timeout for connection operations (default: C<300>).
975		1358
976	=item $AnyEvent::HTTP::USERAGENT	1359	=item $AnyEvent::HTTP::USERAGENT
977		1360
978	The default value for the C<User-Agent> header (the default is	1361	The default value for the C<User-Agent> header (the default is
979	C<Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>).	1362	C<Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>).
980		1363
981	=item $AnyEvent::HTTP::MAX_PER_HOST	1364	=item $AnyEvent::HTTP::MAX_PER_HOST
982		1365
983	The maximum number of concurrent connections to the same host (identified	1366	The maximum number of concurrent connections to the same host (identified
984	by the hostname). If the limit is exceeded, then the additional requests	1367	by the hostname). If the limit is exceeded, then additional requests
985	are queued until previous connections are closed.	1368	are queued until previous connections are closed. Both persistent and
		1369	non-persistent connections are counted in this limit.
986		1370
987	The default value for this is C<4>, and it is highly advisable to not	1371	The default value for this is C<4>, and it is highly advisable to not
988	increase it.	1372	increase it much.
		1373
		1374	For comparison: the RFC's recommend 4 non-persistent or 2 persistent
		1375	connections, older browsers used 2, newer ones (such as firefox 3)
		1376	typically use 6, and Opera uses 8 because like, they have the fastest
		1377	browser and give a shit for everybody else on the planet.
		1378
		1379	=item $AnyEvent::HTTP::PERSISTENT_TIMEOUT
		1380
		1381	The time after which idle persistent connections get closed by
		1382	AnyEvent::HTTP (default: C<3>).
989		1383
990	=item $AnyEvent::HTTP::ACTIVE	1384	=item $AnyEvent::HTTP::ACTIVE
991		1385
992	The number of active connections. This is not the number of currently	1386	The number of active connections. This is not the number of currently
993	running requests, but the number of currently open and non-idle TCP	1387	running requests, but the number of currently open and non-idle TCP
994	connections. This number of can be useful for load-leveling.	1388	connections. This number can be useful for load-leveling.
995		1389
996	=back	1390	=back
997		1391
998	=cut	1392	=cut
999		1393
…		…
1014	sub parse_date($) {	1408	sub parse_date($) {
1015	my ($date) = @_;	1409	my ($date) = @_;
1016		1410
1017	my ($d, $m, $y, $H, $M, $S);	1411	my ($d, $m, $y, $H, $M, $S);
1018		1412
1019	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$/) {	1413	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$/) {
1020	# RFC 822/1123, required by RFC 2616 (with " ")	1414	# RFC 822/1123, required by RFC 2616 (with " ")
1021	# cookie dates (with "-")	1415	# cookie dates (with "-")
1022		1416
1023	($d, $m, $y, $H, $M, $S) = ($1, $2, $3, $4, $5, $6);	1417	($d, $m, $y, $H, $M, $S) = ($1, $2, $3, $4, $5, $6);
1024		1418
1025	} 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$/) {	1419	} 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$/) {
1026	# RFC 850	1420	# RFC 850
1027	($d, $m, $y, $H, $M, $S) = ($1, $2, $3 < 69 ? $3 + 2000 : $3 + 1900, $4, $5, $6);	1421	($d, $m, $y, $H, $M, $S) = ($1, $2, $3 < 69 ? $3 + 2000 : $3 + 1900, $4, $5, $6);
1028		1422
1029	} 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])$/) {	1423	} 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])$/) {
1030	# ISO C's asctime	1424	# ISO C's asctime
1031	($d, $m, $y, $H, $M, $S) = ($2, $1, $6, $3, $4, $5);	1425	($d, $m, $y, $H, $M, $S) = ($2, $1, $6, $3, $4, $5);
1032	}	1426	}
1033	# other formats fail in the loop below	1427	# other formats fail in the loop below
1034		1428
1035	for (0..11) {	1429	for (0..11) {
1036	if ($m eq $month[$_]) {	1430	if ($m eq $month[$_]) {
1037	require Time::Local;	1431	require Time::Local;
1038	return Time::Local::timegm ($S, $M, $H, $d, $_, $y);	1432	return eval { Time::Local::timegm ($S, $M, $H, $d, $_, $y) };
1039	}	1433	}
1040	}	1434	}
1041		1435
1042	undef	1436	undef
1043	}	1437	}
1044		1438
1045	sub set_proxy($) {	1439	sub set_proxy($) {
1046	if (length $_[0]) {	1440	if (length $_[0]) {
1047	$_[0] =~ m%^(https?):// ([^:/]+) (?: : (\d*) )?%ix	1441	$_[0] =~ m%^(http):// ([^:/]+) (?: : (\d*) )?%ix
1048	or Carp::croak "$_[0]: invalid proxy URL";	1442	or Carp::croak "$_[0]: invalid proxy URL";
1049	$PROXY = [$2, $3 || 3128, $1]	1443	$PROXY = [$2, $3 || 3128, $1]
1050	} else {	1444	} else {
1051	undef $PROXY;	1445	undef $PROXY;
1052	}	1446	}
…		…
1055	# initialise proxy from environment	1449	# initialise proxy from environment
1056	eval {	1450	eval {
1057	set_proxy $ENV{http_proxy};	1451	set_proxy $ENV{http_proxy};
1058	};	1452	};
1059		1453
		1454	=head2 SHOWCASE
		1455
		1456	This section contains some more elaborate "real-world" examples or code
		1457	snippets.
		1458
		1459	=head2 HTTP/1.1 FILE DOWNLOAD
		1460
		1461	Downloading files with HTTP can be quite tricky, especially when something
		1462	goes wrong and you want to resume.
		1463
		1464	Here is a function that initiates and resumes a download. It uses the
		1465	last modified time to check for file content changes, and works with many
		1466	HTTP/1.0 servers as well, and usually falls back to a complete re-download
		1467	on older servers.
		1468
		1469	It calls the completion callback with either C<undef>, which means a
		1470	nonretryable error occurred, C<0> when the download was partial and should
		1471	be retried, and C<1> if it was successful.
		1472
		1473	use AnyEvent::HTTP;
		1474
		1475	sub download($$$) {
		1476	my ($url, $file, $cb) = @_;
		1477
		1478	open my $fh, "+<", $file
		1479	or die "$file: $!";
		1480
		1481	my %hdr;
		1482	my $ofs = 0;
		1483
		1484	if (stat $fh and -s _) {
		1485	$ofs = -s _;
		1486	warn "-s is ", $ofs;
		1487	$hdr{"if-unmodified-since"} = AnyEvent::HTTP::format_date +(stat _)[9];
		1488	$hdr{"range"} = "bytes=$ofs-";
		1489	}
		1490
		1491	http_get $url,
		1492	headers => \%hdr,
		1493	on_header => sub {
		1494	my ($hdr) = @_;
		1495
		1496	if ($hdr->{Status} == 200 && $ofs) {
		1497	# resume failed
		1498	truncate $fh, $ofs = 0;
		1499	}
		1500
		1501	sysseek $fh, $ofs, 0;
		1502
		1503	1
		1504	},
		1505	on_body => sub {
		1506	my ($data, $hdr) = @_;
		1507
		1508	if ($hdr->{Status} =~ /^2/) {
		1509	length $data == syswrite $fh, $data
		1510	or return; # abort on write errors
		1511	}
		1512
		1513	1
		1514	},
		1515	sub {
		1516	my (undef, $hdr) = @_;
		1517
		1518	my $status = $hdr->{Status};
		1519
		1520	if (my $time = AnyEvent::HTTP::parse_date $hdr->{"last-modified"}) {
		1521	utime $time, $time, $fh;
		1522	}
		1523
		1524	if ($status == 200 || $status == 206 || $status == 416) {
		1525	# download ok || resume ok || file already fully downloaded
		1526	$cb->(1, $hdr);
		1527
		1528	} elsif ($status == 412) {
		1529	# file has changed while resuming, delete and retry
		1530	unlink $file;
		1531	$cb->(0, $hdr);
		1532
		1533	} elsif ($status == 500 or $status == 503 or $status =~ /^59/) {
		1534	# retry later
		1535	$cb->(0, $hdr);
		1536
		1537	} else {
		1538	$cb->(undef, $hdr);
		1539	}
		1540	}
		1541	;
		1542	}
		1543
		1544	download "http://server/somelargefile", "/tmp/somelargefile", sub {
		1545	if ($_[0]) {
		1546	print "OK!\n";
		1547	} elsif (defined $_[0]) {
		1548	print "please retry later\n";
		1549	} else {
		1550	print "ERROR\n";
		1551	}
		1552	};
		1553
1060	=head2 SOCKS PROXIES	1554	=head3 SOCKS PROXIES
1061		1555
1062	Socks proxies are not directly supported by AnyEvent::HTTP. You can	1556	Socks proxies are not directly supported by AnyEvent::HTTP. You can
1063	compile your perl to support socks, or use an external program such as	1557	compile your perl to support socks, or use an external program such as
1064	F<socksify> (dante) or F<tsocks> to make your program use a socks proxy	1558	F<socksify> (dante) or F<tsocks> to make your program use a socks proxy
1065	transparently.	1559	transparently.

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