ViewVC Help

View File | Revision Log | Show Annotations | Download File

/cvs/AnyEvent-HTTP/HTTP.pm

Comparing AnyEvent-HTTP/HTTP.pm (file contents):
Revision 1.41 by root, Sun Jul 5 23:50:59 2009 UTC vs.
Revision 1.119 by root, Sun Jun 8 23:33:28 2014 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 4.452 ();	45	use AnyEvent 5.0 ();
47	use AnyEvent::Util ();	46	use AnyEvent::Util ();
48	use AnyEvent::Socket ();
49	use AnyEvent::Handle ();	47	use AnyEvent::Handle ();
50		48
51	use base Exporter::;	49	use base Exporter::;
52		50
53	our $VERSION = '1.12';	51	our $VERSION = 2.2;
54		52
55	our @EXPORT = qw(http_get http_post http_head http_request);	53	our @EXPORT = qw(http_get http_post http_head http_request);
56		54
57	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)";
58	our $MAX_RECURSE = 10;	56	our $MAX_RECURSE = 10;
59	our $MAX_PERSISTENT = 8;
60	our $PERSISTENT_TIMEOUT = 2;	57	our $PERSISTENT_TIMEOUT = 3;
61	our $TIMEOUT = 300;	58	our $TIMEOUT = 300;
62		59	our $MAX_PER_HOST = 4; # changing this is evil
63	# changing these is evil
64	our $MAX_PERSISTENT_PER_HOST = 2;
65	our $MAX_PER_HOST = 4;
66		60
67	our $PROXY;	61	our $PROXY;
68	our $ACTIVE = 0;	62	our $ACTIVE = 0;
69		63
70	my %KA_COUNT; # number of open keep-alive connections per host	64	my %KA_CACHE; # indexed by uhost currently, points to [$handle...] array
71	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
72		66
73	=item http_get $url, key => value..., $cb->($data, $headers)	67	=item http_get $url, key => value..., $cb->($data, $headers)
74		68
75	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
…		…
92	must be an absolute http or https URL.	86	must be an absolute http or https URL.
93		87
94	When called in void context, nothing is returned. In other contexts,	88	When called in void context, nothing is returned. In other contexts,
95	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
96	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
97	destroyed before the callbakc is called, the request will be cancelled.	91	destroyed before the callback is called, the request will be cancelled.
98		92
99	The callback will be called with the response data as first argument	93	The callback will be called with the response body data as first argument
100	(or C<undef> if it wasn't available due to errors), and a hash-ref with	94	(or C<undef> if an error occurred), and a hash-ref with response headers
101	response headers as second argument.	95	(and trailers) as second argument.
102		96
103	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
104	headers, the "pseudo-headers" C<HTTPVersion>, C<Status> and C<Reason>	98	headers, the "pseudo-headers" (uppercase to avoid clashing with possible
		99	response headers) C<HTTPVersion>, C<Status> and C<Reason> contain the
105	contain the three parts of the HTTP Status-Line of the same name. The	100	three parts of the HTTP Status-Line of the same name. If an error occurs
		101	during the body phase of a request, then the original C<Status> and
		102	C<Reason> values from the header are available as C<OrigStatus> and
		103	C<OrigReason>.
		104
106	pseudo-header C<URL> contains the original URL (which can differ from the	105	The pseudo-header C<URL> contains the actual URL (which can differ from
107	requested URL when following redirects).	106	the requested URL when following redirects - for example, you might get
		107	an error that your URL scheme is not supported even though your URL is a
		108	valid http URL because it redirected to an ftp URL, in which case you can
		109	look at the URL pseudo header).
		110
		111	The pseudo-header C<Redirect> only exists when the request was a result
		112	of an internal redirect. In that case it is an array reference with
		113	the C<($data, $headers)> from the redirect response. Note that this
		114	response could in turn be the result of a redirect itself, and C<<
		115	$headers->{Redirect}[1]{Redirect} >> will then contain the original
		116	response, and so on.
108		117
109	If the server sends a header multiple times, then their contents will be	118	If the server sends a header multiple times, then their contents will be
110	joined together with a comma (C<,>), as per the HTTP spec.	119	joined together with a comma (C<,>), as per the HTTP spec.
111		120
112	If an internal error occurs, such as not being able to resolve a hostname,	121	If an internal error occurs, such as not being able to resolve a hostname,
113	then C<$data> will be C<undef>, C<< $headers->{Status} >> will be C<59x>	122	then C<$data> will be C<undef>, C<< $headers->{Status} >> will be
114	(usually C<599>) and the C<Reason> pseudo-header will contain an error	123	C<590>-C<599> and the C<Reason> pseudo-header will contain an error
115	message.	124	message. Currently the following status codes are used:
		125
		126	=over 4
		127
		128	=item 595 - errors during connection establishment, proxy handshake.
		129
		130	=item 596 - errors during TLS negotiation, request sending and header processing.
		131
		132	=item 597 - errors during body receiving or processing.
		133
		134	=item 598 - user aborted request via C<on_header> or C<on_body>.
		135
		136	=item 599 - other, usually nonretryable, errors (garbled URL etc.).
		137
		138	=back
116		139
117	A typical callback might look like this:	140	A typical callback might look like this:
118		141
119	sub {	142	sub {
120	my ($body, $hdr) = @_;	143	my ($body, $hdr) = @_;
…		…
131		154
132	=over 4	155	=over 4
133		156
134	=item recurse => $count (default: $MAX_RECURSE)	157	=item recurse => $count (default: $MAX_RECURSE)
135		158
136	Whether to recurse requests or not, e.g. on redirects, authentication	159	Whether to recurse requests or not, e.g. on redirects, authentication and
137	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.
138		166
139	=item headers => hashref	167	=item headers => hashref
140		168
141	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
142	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
143	and will provide defaults for C<User-Agent:> and C<Referer:>.	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
		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.
144		181
145	=item timeout => $seconds	182	=item timeout => $seconds
146		183
147	The time-out to use for various stages - each connect attempt will reset	184	The time-out to use for various stages - each connect attempt will reset
148	the timeout, as will read or write activity. Default timeout is 5 minutes.	185	the timeout, as will read or write activity, i.e. this is not an overall
		186	timeout.
		187
		188	Default timeout is 5 minutes.
149		189
150	=item proxy => [$host, $port[, $scheme]] or undef	190	=item proxy => [$host, $port[, $scheme]] or undef
151		191
152	Use the given http proxy for all requests. If not specified, then the	192	Use the given http proxy for all requests, or no proxy if C<undef> is
153	default proxy (as specified by C<$ENV{http_proxy}>) is used.	193	used.
154		194
155	C<$scheme> must be either missing or C<http> for HTTP, or C<https> for	195	C<$scheme> must be either missing or must be C<http> for HTTP.
156	HTTPS.	196
		197	If not specified, then the default proxy is used (see
		198	C<AnyEvent::HTTP::set_proxy>).
157		199
158	=item body => $string	200	=item body => $string
159		201
160	The request body, usually empty. Will be-sent as-is (future versions of	202	The request body, usually empty. Will be sent as-is (future versions of
161	this module might offer more options).	203	this module might offer more options).
162		204
163	=item cookie_jar => $hash_ref	205	=item cookie_jar => $hash_ref
164		206
165	Passing this parameter enables (simplified) cookie-processing, loosely	207	Passing this parameter enables (simplified) cookie-processing, loosely
166	based on the original netscape specification.	208	based on the original netscape specification.
167		209
168	The C<$hash_ref> must be an (initially empty) hash reference which will	210	The C<$hash_ref> must be an (initially empty) hash reference which
169	get updated automatically. It is possible to save the cookie_jar to	211	will get updated automatically. It is possible to save the cookie jar
170	persistent storage with something like JSON or Storable, but this is not	212	to persistent storage with something like JSON or Storable - see the
171	recommended, as expiry times are currently being ignored.	213	C<AnyEvent::HTTP::cookie_jar_expire> function if you wish to remove
		214	expired or session-only cookies, and also for documentation on the format
		215	of the cookie jar.
172		216
173	Note that this cookie implementation is not of very high quality, nor	217	Note that this cookie implementation is not meant to be complete. If
174	meant to be complete. If you want complete cookie management you have to	218	you want complete cookie management you have to do that on your
175	do that on your own. C<cookie_jar> is meant as a quick fix to get some	219	own. C<cookie_jar> is meant as a quick fix to get most cookie-using sites
176	cookie-using sites working. Cookies are a privacy disaster, do not use	220	working. Cookies are a privacy disaster, do not use them unless required
177	them unless required to.	221	to.
		222
		223	When cookie processing is enabled, the C<Cookie:> and C<Set-Cookie:>
		224	headers will be set and handled by this module, otherwise they will be
		225	left untouched.
178		226
179	=item tls_ctx => $scheme | $tls_ctx	227	=item tls_ctx => $scheme | $tls_ctx
180		228
181	Specifies the AnyEvent::TLS context to be used for https connections. This	229	Specifies the AnyEvent::TLS context to be used for https connections. This
182	parameter follows the same rules as the C<tls_ctx> parameter to	230	parameter follows the same rules as the C<tls_ctx> parameter to
…		…
186	verification) TLS context.	234	verification) TLS context.
187		235
188	The default for this option is C<low>, which could be interpreted as "give	236	The default for this option is C<low>, which could be interpreted as "give
189	me the page, no matter what".	237	me the page, no matter what".
190		238
		239	See also the C<sessionid> parameter.
		240
		241	=item session => $string
		242
		243	The module might reuse connections to the same host internally. Sometimes
		244	(e.g. when using TLS), you do not want to reuse connections from other
		245	sessions. This can be achieved by setting this parameter to some unique
		246	ID (such as the address of an object storing your state data, or the TLS
		247	context) - only connections using the same unique ID will be reused.
		248
		249	=item on_prepare => $callback->($fh)
		250
		251	In rare cases you need to "tune" the socket before it is used to
		252	connect (for example, to bind it on a given IP address). This parameter
		253	overrides the prepare callback passed to C<AnyEvent::Socket::tcp_connect>
		254	and behaves exactly the same way (e.g. it has to provide a
		255	timeout). See the description for the C<$prepare_cb> argument of
		256	C<AnyEvent::Socket::tcp_connect> for details.
		257
		258	=item tcp_connect => $callback->($host, $service, $connect_cb, $prepare_cb)
		259
		260	In even rarer cases you want total control over how AnyEvent::HTTP
		261	establishes connections. Normally it uses L<AnyEvent::Socket::tcp_connect>
		262	to do this, but you can provide your own C<tcp_connect> function -
		263	obviously, it has to follow the same calling conventions, except that it
		264	may always return a connection guard object.
		265
		266	There are probably lots of weird uses for this function, starting from
		267	tracing the hosts C<http_request> actually tries to connect, to (inexact
		268	but fast) host => IP address caching or even socks protocol support.
		269
191	=item on_header => $callback->($hdr)	270	=item on_header => $callback->($headers)
192		271
193	When specified, this callback will be called with the header hash as soon	272	When specified, this callback will be called with the header hash as soon
194	as headers have been successfully received from the remote server (not on	273	as headers have been successfully received from the remote server (not on
195	locally-generated errors).	274	locally-generated errors).
196		275
…		…
200		279
201	This callback is useful, among other things, to quickly reject unwanted	280	This callback is useful, among other things, to quickly reject unwanted
202	content, which, if it is supposed to be rare, can be faster than first	281	content, which, if it is supposed to be rare, can be faster than first
203	doing a C<HEAD> request.	282	doing a C<HEAD> request.
204		283
		284	The downside is that cancelling the request makes it impossible to re-use
		285	the connection. Also, the C<on_header> callback will not receive any
		286	trailer (headers sent after the response body).
		287
		288	Example: cancel the request unless the content-type is "text/html".
		289
		290	on_header => sub {
		291	$_[0]{"content-type"} =~ /^text\/html\s*(?:;|$)/
		292	},
		293
205	=item on_body => $callback->($data, $hdr)	294	=item on_body => $callback->($partial_body, $headers)
206		295
207	When specified, all body data will be "filtered" through this callback.	296	When specified, all body data will be passed to this callback instead of
		297	to the completion callback. The completion callback will get the empty
		298	string instead of the body data.
208		299
209	The callback will incrementally receive body data, and is supposed to	300	It has to return either true (in which case AnyEvent::HTTP will continue),
210	return it or a modified version of it (empty strings are valid returns).	301	or false, in which case AnyEvent::HTTP will cancel the download (and call
		302	the completion callback with an error code of C<598>).
211		303
212	If the callback returns C<undef>, then the request will be cancelled.	304	The downside to cancelling the request is that it makes it impossible to
		305	re-use the connection.
213		306
214	This callback is useful when you want to do some processing on the data,	307	This callback is useful when the data is too large to be held in memory
215	or the data is too large to be held in memory (so the callback writes it	308	(so the callback writes it to a file) or when only some information should
216	to a file and returns the empty string) and so on.	309	be extracted, or when the body should be processed incrementally.
217		310
218	It is usually preferred over doing your own body handling via	311	It is usually preferred over doing your own body handling via
219	C<want_body_handle>.	312	C<want_body_handle>, but in case of streaming APIs, where HTTP is
		313	only used to create a connection, C<want_body_handle> is the better
		314	alternative, as it allows you to install your own event handler, reducing
		315	resource usage.
220		316
221	=item want_body_handle => $enable	317	=item want_body_handle => $enable
222		318
223	When enabled (default is disabled), the behaviour of AnyEvent::HTTP	319	When enabled (default is disabled), the behaviour of AnyEvent::HTTP
224	changes considerably: after parsing the headers, and instead of	320	changes considerably: after parsing the headers, and instead of
…		…
226	called. Instead of the C<$body> argument containing the body data, the	322	called. Instead of the C<$body> argument containing the body data, the
227	callback will receive the L<AnyEvent::Handle> object associated with the	323	callback will receive the L<AnyEvent::Handle> object associated with the
228	connection. In error cases, C<undef> will be passed. When there is no body	324	connection. In error cases, C<undef> will be passed. When there is no body
229	(e.g. status C<304>), the empty string will be passed.	325	(e.g. status C<304>), the empty string will be passed.
230		326
231	The handle object might or might not be in TLS mode, might be connected to	327	The handle object might or might not be in TLS mode, might be connected
232	a proxy, be a persistent connection etc., and configured in unspecified	328	to a proxy, be a persistent connection, use chunked transfer encoding
233	ways. The user is responsible for this handle (it will not be used by this	329	etc., and configured in unspecified ways. The user is responsible for this
234	module anymore).	330	handle (it will not be used by this module anymore).
235		331
236	This is useful with some push-type services, where, after the initial	332	This is useful with some push-type services, where, after the initial
237	headers, an interactive protocol is used (typical example would be the	333	headers, an interactive protocol is used (typical example would be the
238	push-style twitter API which starts a JSON/XML stream).	334	push-style twitter API which starts a JSON/XML stream).
239		335
240	If you think you need this, first have a look at C<on_body>, to see if	336	If you think you need this, first have a look at C<on_body>, to see if
241	that doesn'T solve your problem in a better way.	337	that doesn't solve your problem in a better way.
		338
		339	=item persistent => $boolean
		340
		341	Try to create/reuse a persistent connection. When this flag is set
		342	(default: true for idempotent requests, false for all others), then
		343	C<http_request> tries to re-use an existing (previously-created)
		344	persistent connection to the host and, failing that, tries to create a new
		345	one.
		346
		347	Requests failing in certain ways will be automatically retried once, which
		348	is dangerous for non-idempotent requests, which is why it defaults to off
		349	for them. The reason for this is because the bozos who designed HTTP/1.1
		350	made it impossible to distinguish between a fatal error and a normal
		351	connection timeout, so you never know whether there was a problem with
		352	your request or not.
		353
		354	When reusing an existent connection, many parameters (such as TLS context)
		355	will be ignored. See the C<session> parameter for a workaround.
		356
		357	=item keepalive => $boolean
		358
		359	Only used when C<persistent> is also true. This parameter decides whether
		360	C<http_request> tries to handshake a HTTP/1.0-style keep-alive connection
		361	(as opposed to only a HTTP/1.1 persistent connection).
		362
		363	The default is true, except when using a proxy, in which case it defaults
		364	to false, as HTTP/1.0 proxies cannot support this in a meaningful way.
		365
		366	=item handle_params => { key => value ... }
		367
		368	The key-value pairs in this hash will be passed to any L<AnyEvent::Handle>
		369	constructor that is called - not all requests will create a handle, and
		370	sometimes more than one is created, so this parameter is only good for
		371	setting hints.
		372
		373	Example: set the maximum read size to 4096, to potentially conserve memory
		374	at the cost of speed.
		375
		376	handle_params => {
		377	max_read_size => 4096,
		378	},
242		379
243	=back	380	=back
244		381
245	Example: make a simple HTTP GET request for http://www.nethype.de/	382	Example: do a simple HTTP GET request for http://www.nethype.de/ and print
		383	the response body.
246		384
247	http_request GET => "http://www.nethype.de/", sub {	385	http_request GET => "http://www.nethype.de/", sub {
248	my ($body, $hdr) = @_;	386	my ($body, $hdr) = @_;
249	print "$body\n";	387	print "$body\n";
250	};	388	};
251		389
252	Example: make a HTTP HEAD request on https://www.google.com/, use a	390	Example: do a HTTP HEAD request on https://www.google.com/, use a
253	timeout of 30 seconds.	391	timeout of 30 seconds.
254		392
255	http_request	393	http_request
256	GET => "https://www.google.com",	394	HEAD => "https://www.google.com",
		395	headers => { "user-agent" => "MySearchClient 1.0" },
257	timeout => 30,	396	timeout => 30,
258	sub {	397	sub {
259	my ($body, $hdr) = @_;	398	my ($body, $hdr) = @_;
260	use Data::Dumper;	399	use Data::Dumper;
261	print Dumper $hdr;	400	print Dumper $hdr;
262	}	401	}
263	;	402	;
264		403
265	Example: make another simple HTTP GET request, but immediately try to	404	Example: do another simple HTTP GET request, but immediately try to
266	cancel it.	405	cancel it.
267		406
268	my $request = http_request GET => "http://www.nethype.de/", sub {	407	my $request = http_request GET => "http://www.nethype.de/", sub {
269	my ($body, $hdr) = @_;	408	my ($body, $hdr) = @_;
270	print "$body\n";	409	print "$body\n";
271	};	410	};
272		411
273	undef $request;	412	undef $request;
274		413
275	=cut	414	=cut
		415
		416	#############################################################################
		417	# wait queue/slots
276		418
277	sub _slot_schedule;	419	sub _slot_schedule;
278	sub _slot_schedule($) {	420	sub _slot_schedule($) {
279	my $host = shift;	421	my $host = shift;
280		422
…		…
302	push @{ $CO_SLOT{$_[0]}[1] }, $_[1];	444	push @{ $CO_SLOT{$_[0]}[1] }, $_[1];
303		445
304	_slot_schedule $_[0];	446	_slot_schedule $_[0];
305	}	447	}
306		448
307	our $qr_nl = qr<\015?\012>;	449	#############################################################################
308	our $qr_nlnl = qr<\015?\012\015?\012>;	450	# cookie handling
		451
		452	# expire cookies
		453	sub cookie_jar_expire($;$) {
		454	my ($jar, $session_end) = @_;
		455
		456	%$jar = () if $jar->{version} != 1;
		457
		458	my $anow = AE::now;
		459
		460	while (my ($chost, $paths) = each %$jar) {
		461	next unless ref $paths;
		462
		463	while (my ($cpath, $cookies) = each %$paths) {
		464	while (my ($cookie, $kv) = each %$cookies) {
		465	if (exists $kv->{_expires}) {
		466	delete $cookies->{$cookie}
		467	if $anow > $kv->{_expires};
		468	} elsif ($session_end) {
		469	delete $cookies->{$cookie};
		470	}
		471	}
		472
		473	delete $paths->{$cpath}
		474	unless %$cookies;
		475	}
		476
		477	delete $jar->{$chost}
		478	unless %$paths;
		479	}
		480	}
		481
		482	# extract cookies from jar
		483	sub cookie_jar_extract($$$$) {
		484	my ($jar, $scheme, $host, $path) = @_;
		485
		486	%$jar = () if $jar->{version} != 1;
		487
		488	my @cookies;
		489
		490	while (my ($chost, $paths) = each %$jar) {
		491	next unless ref $paths;
		492
		493	if ($chost =~ /^\./) {
		494	next unless $chost eq substr $host, -length $chost;
		495	} elsif ($chost =~ /\./) {
		496	next unless $chost eq $host;
		497	} else {
		498	next;
		499	}
		500
		501	while (my ($cpath, $cookies) = each %$paths) {
		502	next unless $cpath eq substr $path, 0, length $cpath;
		503
		504	while (my ($cookie, $kv) = each %$cookies) {
		505	next if $scheme ne "https" && exists $kv->{secure};
		506
		507	if (exists $kv->{_expires} and AE::now > $kv->{_expires}) {
		508	delete $cookies->{$cookie};
		509	next;
		510	}
		511
		512	my $value = $kv->{value};
		513
		514	if ($value =~ /[=;,[:space:]]/) {
		515	$value =~ s/([\\"])/\\$1/g;
		516	$value = "\"$value\"";
		517	}
		518
		519	push @cookies, "$cookie=$value";
		520	}
		521	}
		522	}
		523
		524	\@cookies
		525	}
		526
		527	# parse set_cookie header into jar
		528	sub cookie_jar_set_cookie($$$$) {
		529	my ($jar, $set_cookie, $host, $date) = @_;
		530
		531	my $anow = int AE::now;
		532	my $snow; # server-now
		533
		534	for ($set_cookie) {
		535	# parse NAME=VALUE
		536	my @kv;
		537
		538	# expires is not http-compliant in the original cookie-spec,
		539	# we support the official date format and some extensions
		540	while (
		541	m{
		542	\G\s*
		543	(?:
		544	expires \s*=\s* ([A-Z][a-z][a-z]+,\ [^,;]+)
		545	| ([^=;,[:space:]]+) (?: \s*=\s* (?: "((?:[^\\"]+|\\.)*)" | ([^;,[:space:]]*) ) )?
		546	)
		547	}gcxsi
		548	) {
		549	my $name = $2;
		550	my $value = $4;
		551
		552	if (defined $1) {
		553	# expires
		554	$name = "expires";
		555	$value = $1;
		556	} elsif (defined $3) {
		557	# quoted
		558	$value = $3;
		559	$value =~ s/\\(.)/$1/gs;
		560	}
		561
		562	push @kv, @kv ? lc $name : $name, $value;
		563
		564	last unless /\G\s*;/gc;
		565	}
		566
		567	last unless @kv;
		568
		569	my $name = shift @kv;
		570	my %kv = (value => shift @kv, @kv);
		571
		572	if (exists $kv{"max-age"}) {
		573	$kv{_expires} = $anow + delete $kv{"max-age"};
		574	} elsif (exists $kv{expires}) {
		575	$snow ||= parse_date ($date) || $anow;
		576	$kv{_expires} = $anow + (parse_date (delete $kv{expires}) - $snow);
		577	} else {
		578	delete $kv{_expires};
		579	}
		580
		581	my $cdom;
		582	my $cpath = (delete $kv{path}) || "/";
		583
		584	if (exists $kv{domain}) {
		585	$cdom = delete $kv{domain};
		586
		587	$cdom =~ s/^\.?/./; # make sure it starts with a "."
		588
		589	next if $cdom =~ /\.$/;
		590
		591	# this is not rfc-like and not netscape-like. go figure.
		592	my $ndots = $cdom =~ y/.//;
		593	next if $ndots < ($cdom =~ /\.[^.][^.]\.[^.][^.]$/ ? 3 : 2);
		594	} else {
		595	$cdom = $host;
		596	}
		597
		598	# store it
		599	$jar->{version} = 1;
		600	$jar->{lc $cdom}{$cpath}{$name} = \%kv;
		601
		602	redo if /\G\s*,/gc;
		603	}
		604	}
		605
		606	#############################################################################
		607	# keepalive/persistent connection cache
		608
		609	# fetch a connection from the keepalive cache
		610	sub ka_fetch($) {
		611	my $ka_key = shift;
		612
		613	my $hdl = pop @{ $KA_CACHE{$ka_key} }; # currently we reuse the MOST RECENTLY USED connection
		614	delete $KA_CACHE{$ka_key}
		615	unless @{ $KA_CACHE{$ka_key} };
		616
		617	$hdl
		618	}
		619
		620	sub ka_store($$) {
		621	my ($ka_key, $hdl) = @_;
		622
		623	my $kaa = $KA_CACHE{$ka_key} ||= [];
		624
		625	my $destroy = sub {
		626	my @ka = grep $_ != $hdl, @{ $KA_CACHE{$ka_key} };
		627
		628	$hdl->destroy;
		629
		630	@ka
		631	? $KA_CACHE{$ka_key} = \@ka
		632	: delete $KA_CACHE{$ka_key};
		633	};
		634
		635	# on error etc., destroy
		636	$hdl->on_error ($destroy);
		637	$hdl->on_eof ($destroy);
		638	$hdl->on_read ($destroy);
		639	$hdl->timeout ($PERSISTENT_TIMEOUT);
		640
		641	push @$kaa, $hdl;
		642	shift @$kaa while @$kaa > $MAX_PER_HOST;
		643	}
		644
		645	#############################################################################
		646	# utilities
		647
		648	# continue to parse $_ for headers and place them into the arg
		649	sub _parse_hdr() {
		650	my %hdr;
		651
		652	# things seen, not parsed:
		653	# p3pP="NON CUR OTPi OUR NOR UNI"
		654
		655	$hdr{lc $1} .= ",$2"
		656	while /\G
		657	([^:\000-\037]*):
		658	[\011\040]*
		659	((?: [^\012]+ | \012[\011\040] )*)
		660	\012
		661	/gxc;
		662
		663	/\G$/
		664	or return;
		665
		666	# remove the "," prefix we added to all headers above
		667	substr $_, 0, 1, ""
		668	for values %hdr;
		669
		670	\%hdr
		671	}
		672
		673	#############################################################################
		674	# http_get
		675
		676	our $qr_nlnl = qr{(?<![^\012])\015?\012};
309		677
310	our $TLS_CTX_LOW = { cache => 1, sslv2 => 1 };	678	our $TLS_CTX_LOW = { cache => 1, sslv2 => 1 };
311	our $TLS_CTX_HIGH = { cache => 1, verify => 1, verify_peername => "https" };	679	our $TLS_CTX_HIGH = { cache => 1, verify => 1, verify_peername => "https" };
		680
		681	# maybe it should just become a normal object :/
		682
		683	sub _destroy_state(\%) {
		684	my ($state) = @_;
		685
		686	$state->{handle}->destroy if $state->{handle};
		687	%$state = ();
		688	}
		689
		690	sub _error(\%$$) {
		691	my ($state, $cb, $hdr) = @_;
		692
		693	&_destroy_state ($state);
		694
		695	$cb->(undef, $hdr);
		696	()
		697	}
		698
		699	our %IDEMPOTENT = (
		700	DELETE => 1,
		701	GET => 1,
		702	HEAD => 1,
		703	OPTIONS => 1,
		704	PUT => 1,
		705	TRACE => 1,
		706
		707	ACL => 1,
		708	"BASELINE-CONTROL" => 1,
		709	BIND => 1,
		710	CHECKIN => 1,
		711	CHECKOUT => 1,
		712	COPY => 1,
		713	LABEL => 1,
		714	LINK => 1,
		715	MERGE => 1,
		716	MKACTIVITY => 1,
		717	MKCALENDAR => 1,
		718	MKCOL => 1,
		719	MKREDIRECTREF => 1,
		720	MKWORKSPACE => 1,
		721	MOVE => 1,
		722	ORDERPATCH => 1,
		723	PROPFIND => 1,
		724	PROPPATCH => 1,
		725	REBIND => 1,
		726	REPORT => 1,
		727	SEARCH => 1,
		728	UNBIND => 1,
		729	UNCHECKOUT => 1,
		730	UNLINK => 1,
		731	UNLOCK => 1,
		732	UPDATE => 1,
		733	UPDATEREDIRECTREF => 1,
		734	"VERSION-CONTROL" => 1,
		735	);
312		736
313	sub http_request($$@) {	737	sub http_request($$@) {
314	my $cb = pop;	738	my $cb = pop;
315	my ($method, $url, %arg) = @_;	739	my ($method, $url, %arg) = @_;
316		740
…		…
325	while (my ($k, $v) = each %$hdr) {	749	while (my ($k, $v) = each %$hdr) {
326	$hdr{lc $k} = $v;	750	$hdr{lc $k} = $v;
327	}	751	}
328	}	752	}
329		753
		754	# pseudo headers for all subsequent responses
		755	my @pseudo = (URL => $url);
		756	push @pseudo, Redirect => delete $arg{Redirect} if exists $arg{Redirect};
		757
330	my $recurse = exists $arg{recurse} ? delete $arg{recurse} : $MAX_RECURSE;	758	my $recurse = exists $arg{recurse} ? delete $arg{recurse} : $MAX_RECURSE;
331		759
332	return $cb->(undef, { Status => 599, Reason => "Too many redirections", URL => $url })	760	return $cb->(undef, { @pseudo, Status => 599, Reason => "Too many redirections" })
333	if $recurse < 0;	761	if $recurse < 0;
334		762
335	my $proxy = $arg{proxy} || $PROXY;	763	my $proxy = exists $arg{proxy} ? $arg{proxy} : $PROXY;
336	my $timeout = $arg{timeout} || $TIMEOUT;	764	my $timeout = $arg{timeout} || $TIMEOUT;
337		765
338	my ($uscheme, $uauthority, $upath, $query, $fragment) =	766	my ($uscheme, $uauthority, $upath, $query, undef) = # ignore fragment
339	$url =~ m|(?:([^:/?#]+):)?(?://([^/?#]*))?([^?#]*)(?:\?([^#]*))?(?:#(.*))?|;	767	$url =~ m|^([^:]+):(?://([^/?#]*))?([^?#]*)(?:(\?[^#]*))?(?:#(.*))?$|;
340		768
341	$uscheme = lc $uscheme;	769	$uscheme = lc $uscheme;
342		770
343	my $uport = $uscheme eq "http" ? 80	771	my $uport = $uscheme eq "http" ? 80
344	: $uscheme eq "https" ? 443	772	: $uscheme eq "https" ? 443
345	: return $cb->(undef, { Status => 599, Reason => "Only http and https URL schemes supported", URL => $url });	773	: return $cb->(undef, { @pseudo, Status => 599, Reason => "Only http and https URL schemes supported" });
346		774
347	$uauthority =~ /^(?: .*\@ )? ([^\@:]+) (?: : (\d+) )?$/x	775	$uauthority =~ /^(?: .*\@ )? ([^\@:]+) (?: : (\d+) )?$/x
348	or return $cb->(undef, { Status => 599, Reason => "Unparsable URL", URL => $url });	776	or return $cb->(undef, { @pseudo, Status => 599, Reason => "Unparsable URL" });
349		777
350	my $uhost = $1;	778	my $uhost = lc $1;
351	$uport = $2 if defined $2;	779	$uport = $2 if defined $2;
352		780
		781	$hdr{host} = defined $2 ? "$uhost:$2" : "$uhost"
		782	unless exists $hdr{host};
		783
353	$uhost =~ s/^\[(.*)\]$/$1/;	784	$uhost =~ s/^\[(.*)\]$/$1/;
354	$upath .= "?$query" if length $query;	785	$upath .= $query if length $query;
355		786
356	$upath =~ s%^/?%/%;	787	$upath =~ s%^/?%/%;
357		788
358	# cookie processing	789	# cookie processing
359	if (my $jar = $arg{cookie_jar}) {	790	if (my $jar = $arg{cookie_jar}) {
360	%$jar = () if $jar->{version} != 1;	791	my $cookies = cookie_jar_extract $jar, $uscheme, $uhost, $upath;
361		792
362	my @cookie;
363
364	while (my ($chost, $v) = each %$jar) {
365	if ($chost =~ /^\./) {
366	next unless $chost eq substr $uhost, -length $chost;
367	} elsif ($chost =~ /\./) {
368	next unless $chost eq $uhost;
369	} else {
370	next;
371	}
372
373	while (my ($cpath, $v) = each %$v) {
374	next unless $cpath eq substr $upath, 0, length $cpath;
375
376	while (my ($k, $v) = each %$v) {
377	next if $uscheme ne "https" && exists $v->{secure};
378	my $value = $v->{value};
379	$value =~ s/([\\"])/\\$1/g;
380	push @cookie, "$k=\"$value\"";
381	}
382	}
383	}
384
385	$hdr{cookie} = join "; ", @cookie	793	$hdr{cookie} = join "; ", @$cookies
386	if @cookie;	794	if @$cookies;
387	}	795	}
388		796
389	my ($rhost, $rport, $rscheme, $rpath); # request host, port, path	797	my ($rhost, $rport, $rscheme, $rpath); # request host, port, path
390		798
391	if ($proxy) {	799	if ($proxy) {
392	($rpath, $rhost, $rport, $rscheme) = ($url, @$proxy);	800	($rpath, $rhost, $rport, $rscheme) = ($url, @$proxy);
		801
		802	$rscheme = "http" unless defined $rscheme;
393		803
394	# don't support https requests over https-proxy transport,	804	# don't support https requests over https-proxy transport,
395	# can't be done with tls as spec'ed, unless you double-encrypt.	805	# can't be done with tls as spec'ed, unless you double-encrypt.
396	$rscheme = "http" if $uscheme eq "https" && $rscheme eq "https";	806	$rscheme = "http" if $uscheme eq "https" && $rscheme eq "https";
		807
		808	$rhost = lc $rhost;
		809	$rscheme = lc $rscheme;
397	} else {	810	} else {
398	($rhost, $rport, $rscheme, $rpath) = ($uhost, $uport, $uscheme, $upath);	811	($rhost, $rport, $rscheme, $rpath) = ($uhost, $uport, $uscheme, $upath);
399	}	812	}
400		813
401	$hdr{"user-agent"} ||= $USERAGENT;	814	# leave out fragment and query string, just a heuristic
402	$hdr{referer} ||= "$uscheme://$uauthority$upath"; # leave out fragment and query string, just a heuristic	815	$hdr{referer} = "$uscheme://$uauthority$upath" unless exists $hdr{referer};
		816	$hdr{"user-agent"} = $USERAGENT unless exists $hdr{"user-agent"};
403		817
404	$hdr{host} = "$uhost:$uport";
405	$hdr{"content-length"} = length $arg{body};	818	$hdr{"content-length"} = length $arg{body}
		819	if length $arg{body} || $method ne "GET";
		820
		821	my $idempotent = $IDEMPOTENT{$method};
		822
		823	# default value for keepalive is true iff the request is for an idempotent method
		824	my $persistent = exists $arg{persistent} ? !!$arg{persistent} : $idempotent;
		825	my $keepalive = exists $arg{keepalive} ? !!$arg{keepalive} : !$proxy;
		826	my $was_persistent; # true if this is actually a recycled connection
		827
		828	# the key to use in the keepalive cache
		829	my $ka_key = "$uscheme\x00$uhost\x00$uport\x00$arg{sessionid}";
		830
		831	$hdr{connection} = ($persistent ? $keepalive ? "keep-alive, " : "" : "close, ") . "Te"; #1.1
		832	$hdr{te} = "trailers" unless exists $hdr{te}; #1.1
406		833
407	my %state = (connect_guard => 1);	834	my %state = (connect_guard => 1);
		835
		836	my $ae_error = 595; # connecting
		837
		838	# handle actual, non-tunneled, request
		839	my $handle_actual_request = sub {
		840	$ae_error = 596; # request phase
		841
		842	my $hdl = $state{handle};
		843
		844	$hdl->starttls ("connect") if $uscheme eq "https" && !exists $hdl->{tls};
		845
		846	# send request
		847	$hdl->push_write (
		848	"$method $rpath HTTP/1.1\015\012"
		849	. (join "", map "\u$_: $hdr{$_}\015\012", grep defined $hdr{$_}, keys %hdr)
		850	. "\015\012"
		851	. (delete $arg{body})
		852	);
		853
		854	# return if error occurred during push_write()
		855	return unless %state;
		856
		857	# reduce memory usage, save a kitten, also re-use it for the response headers.
		858	%hdr = ();
		859
		860	# status line and headers
		861	$state{read_response} = sub {
		862	return unless %state;
		863
		864	for ("$_[1]") {
		865	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
		866
		867	/^HTTP\/0*([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\012]*) )? \012/gxci
		868	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Invalid server response" };
		869
		870	# 100 Continue handling
		871	# should not happen as we don't send expect: 100-continue,
		872	# but we handle it just in case.
		873	# since we send the request body regardless, if we get an error
		874	# we are out of-sync, which we currently do NOT handle correctly.
		875	return $state{handle}->push_read (line => $qr_nlnl, $state{read_response})
		876	if $2 eq 100;
		877
		878	push @pseudo,
		879	HTTPVersion => $1,
		880	Status => $2,
		881	Reason => $3,
		882	;
		883
		884	my $hdr = _parse_hdr
		885	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Garbled response headers" };
		886
		887	%hdr = (%$hdr, @pseudo);
		888	}
		889
		890	# redirect handling
		891	# relative uri handling forced by microsoft and other shitheads.
		892	# we give our best and fall back to URI if available.
		893	if (exists $hdr{location}) {
		894	my $loc = $hdr{location};
		895
		896	if ($loc =~ m%^//%) { # //
		897	$loc = "$rscheme:$loc";
		898
		899	} elsif ($loc eq "") {
		900	$loc = $url;
		901
		902	} elsif ($loc !~ /^(?: $ | [^:\/?\#]+ : )/x) { # anything "simple"
		903	$loc =~ s/^\.\/+//;
		904
		905	if ($loc !~ m%^[.?#]%) {
		906	my $prefix = "$rscheme://$uhost:$uport";
		907
		908	unless ($loc =~ s/^\///) {
		909	$prefix .= $upath;
		910	$prefix =~ s/\/[^\/]*$//;
		911	}
		912
		913	$loc = "$prefix/$loc";
		914
		915	} elsif (eval { require URI }) { # uri
		916	$loc = URI->new_abs ($loc, $url)->as_string;
		917
		918	} else {
		919	return _error %state, $cb, { @pseudo, Status => 599, Reason => "Cannot parse Location (URI module missing)" };
		920	#$hdr{Status} = 599;
		921	#$hdr{Reason} = "Unparsable Redirect (URI module missing)";
		922	#$recurse = 0;
		923	}
		924	}
		925
		926	$hdr{location} = $loc;
		927	}
		928
		929	my $redirect;
		930
		931	if ($recurse) {
		932	my $status = $hdr{Status};
		933
		934	# industry standard is to redirect POST as GET for
		935	# 301, 302 and 303, in contrast to HTTP/1.0 and 1.1.
		936	# also, the UA should ask the user for 301 and 307 and POST,
		937	# industry standard seems to be to simply follow.
		938	# we go with the industry standard. 308 is defined
		939	# by rfc7238
		940	if ($status == 301 or $status == 302 or $status == 303) {
		941	# HTTP/1.1 is unclear on how to mutate the method
		942	$method = "GET" unless $method eq "HEAD";
		943	$redirect = 1;
		944	} elsif ($status == 307 or $status == 308) {
		945	$redirect = 1;
		946	}
		947	}
		948
		949	my $finish = sub { # ($data, $err_status, $err_reason[, $persistent])
		950	if ($state{handle}) {
		951	# handle keepalive
		952	if (
		953	$persistent
		954	&& $_[3]
		955	&& ($hdr{HTTPVersion} < 1.1
		956	? $hdr{connection} =~ /\bkeep-?alive\b/i
		957	: $hdr{connection} !~ /\bclose\b/i)
		958	) {
		959	ka_store $ka_key, delete $state{handle};
		960	} else {
		961	# no keepalive, destroy the handle
		962	$state{handle}->destroy;
		963	}
		964	}
		965
		966	%state = ();
		967
		968	if (defined $_[1]) {
		969	$hdr{OrigStatus} = $hdr{Status}; $hdr{Status} = $_[1];
		970	$hdr{OrigReason} = $hdr{Reason}; $hdr{Reason} = $_[2];
		971	}
		972
		973	# set-cookie processing
		974	if ($arg{cookie_jar}) {
		975	cookie_jar_set_cookie $arg{cookie_jar}, $hdr{"set-cookie"}, $uhost, $hdr{date};
		976	}
		977
		978	if ($redirect && exists $hdr{location}) {
		979	# we ignore any errors, as it is very common to receive
		980	# Content-Length != 0 but no actual body
		981	# we also access %hdr, as $_[1] might be an erro
		982	$state{recurse} =
		983	http_request (
		984	$method => $hdr{location},
		985	%arg,
		986	recurse => $recurse - 1,
		987	Redirect => [$_[0], \%hdr],
		988	sub {
		989	%state = ();
		990	&$cb
		991	},
		992	);
		993	} else {
		994	$cb->($_[0], \%hdr);
		995	}
		996	};
		997
		998	$ae_error = 597; # body phase
		999
		1000	my $chunked = $hdr{"transfer-encoding"} =~ /\bchunked\b/i; # not quite correct...
		1001
		1002	my $len = $chunked ? undef : $hdr{"content-length"};
		1003
		1004	# body handling, many different code paths
		1005	# - no body expected
		1006	# - want_body_handle
		1007	# - te chunked
		1008	# - 2x length known (with or without on_body)
		1009	# - 2x length not known (with or without on_body)
		1010	if (!$redirect && $arg{on_header} && !$arg{on_header}(\%hdr)) {
		1011	$finish->(undef, 598 => "Request cancelled by on_header");
		1012	} elsif (
		1013	$hdr{Status} =~ /^(?:1..|204|205|304)$/
		1014	or $method eq "HEAD"
		1015	or (defined $len && $len == 0) # == 0, not !, because "0 " is true
		1016	) {
		1017	# no body
		1018	$finish->("", undef, undef, 1);
		1019
		1020	} elsif (!$redirect && $arg{want_body_handle}) {
		1021	$_[0]->on_eof (undef);
		1022	$_[0]->on_error (undef);
		1023	$_[0]->on_read (undef);
		1024
		1025	$finish->(delete $state{handle});
		1026
		1027	} elsif ($chunked) {
		1028	my $cl = 0;
		1029	my $body = "";
		1030	my $on_body = $arg{on_body} || sub { $body .= shift; 1 };
		1031
		1032	$state{read_chunk} = sub {
		1033	$_[1] =~ /^([0-9a-fA-F]+)/
		1034	or return $finish->(undef, $ae_error => "Garbled chunked transfer encoding");
		1035
		1036	my $len = hex $1;
		1037
		1038	if ($len) {
		1039	$cl += $len;
		1040
		1041	$_[0]->push_read (chunk => $len, sub {
		1042	$on_body->($_[1], \%hdr)
		1043	or return $finish->(undef, 598 => "Request cancelled by on_body");
		1044
		1045	$_[0]->push_read (line => sub {
		1046	length $_[1]
		1047	and return $finish->(undef, $ae_error => "Garbled chunked transfer encoding");
		1048	$_[0]->push_read (line => $state{read_chunk});
		1049	});
		1050	});
		1051	} else {
		1052	$hdr{"content-length"} ||= $cl;
		1053
		1054	$_[0]->push_read (line => $qr_nlnl, sub {
		1055	if (length $_[1]) {
		1056	for ("$_[1]") {
		1057	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
		1058
		1059	my $hdr = _parse_hdr
		1060	or return $finish->(undef, $ae_error => "Garbled response trailers");
		1061
		1062	%hdr = (%hdr, %$hdr);
		1063	}
		1064	}
		1065
		1066	$finish->($body, undef, undef, 1);
		1067	});
		1068	}
		1069	};
		1070
		1071	$_[0]->push_read (line => $state{read_chunk});
		1072
		1073	} elsif ($arg{on_body}) {
		1074	if (defined $len) {
		1075	$_[0]->on_read (sub {
		1076	$len -= length $_[0]{rbuf};
		1077
		1078	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
		1079	or return $finish->(undef, 598 => "Request cancelled by on_body");
		1080
		1081	$len > 0
		1082	or $finish->("", undef, undef, 1);
		1083	});
		1084	} else {
		1085	$_[0]->on_eof (sub {
		1086	$finish->("");
		1087	});
		1088	$_[0]->on_read (sub {
		1089	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
		1090	or $finish->(undef, 598 => "Request cancelled by on_body");
		1091	});
		1092	}
		1093	} else {
		1094	$_[0]->on_eof (undef);
		1095
		1096	if (defined $len) {
		1097	$_[0]->on_read (sub {
		1098	$finish->((substr delete $_[0]{rbuf}, 0, $len, ""), undef, undef, 1)
		1099	if $len <= length $_[0]{rbuf};
		1100	});
		1101	} else {
		1102	$_[0]->on_error (sub {
		1103	($! == Errno::EPIPE || !$!)
		1104	? $finish->(delete $_[0]{rbuf})
		1105	: $finish->(undef, $ae_error => $_[2]);
		1106	});
		1107	$_[0]->on_read (sub { });
		1108	}
		1109	}
		1110	};
		1111
		1112	# if keepalive is enabled, then the server closing the connection
		1113	# before a response can happen legally - we retry on idempotent methods.
		1114	if ($was_persistent && $idempotent) {
		1115	my $old_eof = $hdl->{on_eof};
		1116	$hdl->{on_eof} = sub {
		1117	_destroy_state %state;
		1118
		1119	%state = ();
		1120	$state{recurse} =
		1121	http_request (
		1122	$method => $url,
		1123	%arg,
		1124	recurse => $recurse - 1,
		1125	keepalive => 0,
		1126	sub {
		1127	%state = ();
		1128	&$cb
		1129	}
		1130	);
		1131	};
		1132	$hdl->on_read (sub {
		1133	return unless %state;
		1134
		1135	# as soon as we receive something, a connection close
		1136	# once more becomes a hard error
		1137	$hdl->{on_eof} = $old_eof;
		1138	$hdl->push_read (line => $qr_nlnl, $state{read_response});
		1139	});
		1140	} else {
		1141	$hdl->push_read (line => $qr_nlnl, $state{read_response});
		1142	}
		1143	};
		1144
		1145	my $prepare_handle = sub {
		1146	my ($hdl) = $state{handle};
		1147
		1148	$hdl->on_error (sub {
		1149	_error %state, $cb, { @pseudo, Status => $ae_error, Reason => $_[2] };
		1150	});
		1151	$hdl->on_eof (sub {
		1152	_error %state, $cb, { @pseudo, Status => $ae_error, Reason => "Unexpected end-of-file" };
		1153	});
		1154	$hdl->timeout_reset;
		1155	$hdl->timeout ($timeout);
		1156	};
		1157
		1158	# connected to proxy (or origin server)
		1159	my $connect_cb = sub {
		1160	my $fh = shift
		1161	or return _error %state, $cb, { @pseudo, Status => $ae_error, Reason => "$!" };
		1162
		1163	return unless delete $state{connect_guard};
		1164
		1165	# get handle
		1166	$state{handle} = new AnyEvent::Handle
		1167	%{ $arg{handle_params} },
		1168	fh => $fh,
		1169	peername => $uhost,
		1170	tls_ctx => $arg{tls_ctx},
		1171	;
		1172
		1173	$prepare_handle->();
		1174
		1175	#$state{handle}->starttls ("connect") if $rscheme eq "https";
		1176
		1177	# now handle proxy-CONNECT method
		1178	if ($proxy && $uscheme eq "https") {
		1179	# oh dear, we have to wrap it into a connect request
		1180
		1181	# maybe re-use $uauthority with patched port?
		1182	$state{handle}->push_write ("CONNECT $uhost:$uport HTTP/1.0\015\012\015\012");
		1183	$state{handle}->push_read (line => $qr_nlnl, sub {
		1184	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix
		1185	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Invalid proxy connect response ($_[1])" };
		1186
		1187	if ($2 == 200) {
		1188	$rpath = $upath;
		1189	$handle_actual_request->();
		1190	} else {
		1191	_error %state, $cb, { @pseudo, Status => $2, Reason => $3 };
		1192	}
		1193	});
		1194	} else {
		1195	$handle_actual_request->();
		1196	}
		1197	};
408		1198
409	_get_slot $uhost, sub {	1199	_get_slot $uhost, sub {
410	$state{slot_guard} = shift;	1200	$state{slot_guard} = shift;
411		1201
412	return unless $state{connect_guard};	1202	return unless $state{connect_guard};
413		1203
414	$state{connect_guard} = AnyEvent::Socket::tcp_connect $rhost, $rport, sub {	1204	# try to use an existing keepalive connection, but only if we, ourselves, plan
415	$state{fh} = shift	1205	# on a keepalive request (in theory, this should be a separate config option).
416	or return (%state = (), $cb->(undef, { Status => 599, Reason => "$!", URL => $url }));	1206	if ($persistent && $KA_CACHE{$ka_key}) {
417	pop; # free memory, save a tree	1207	$was_persistent = 1;
418		1208
419	return unless delete $state{connect_guard};	1209	$state{handle} = ka_fetch $ka_key;
		1210	$state{handle}->destroyed
		1211	and die "AnyEvent::HTTP: unexpectedly got a destructed handle (1), please report.";#d#
		1212	$prepare_handle->();
		1213	$state{handle}->destroyed
		1214	and die "AnyEvent::HTTP: unexpectedly got a destructed handle (2), please report.";#d#
		1215	$handle_actual_request->();
420		1216
421	# get handle
422	$state{handle} = new AnyEvent::Handle
423	fh => $state{fh},
424	timeout => $timeout,
425	peername => $rhost,
426	tls_ctx => $arg{tls_ctx};
427
428	# limit the number of persistent connections
429	# keepalive not yet supported
430	if ($KA_COUNT{$_[1]} < $MAX_PERSISTENT_PER_HOST) {
431	++$KA_COUNT{$_[1]};
432	$state{handle}{ka_count_guard} = AnyEvent::Util::guard {
433	--$KA_COUNT{$_[1]}
434	};
435	$hdr{connection} = "keep-alive";
436	} else {	1217	} else {
437	delete $hdr{connection};	1218	my $tcp_connect = $arg{tcp_connect}
438	}	1219	|| do { require AnyEvent::Socket; \&AnyEvent::Socket::tcp_connect };
439		1220
440	# (re-)configure handle	1221	$state{connect_guard} = $tcp_connect->($rhost, $rport, $connect_cb, $arg{on_prepare} || sub { $timeout });
441	$state{handle}->on_error (sub {
442	%state = ();
443	$cb->(undef, { Status => 599, Reason => $_[2], URL => $url });
444	});
445	$state{handle}->on_eof (sub {
446	%state = ();
447	$cb->(undef, { Status => 599, Reason => "Unexpected end-of-file", URL => $url });
448	});
449
450	$state{handle}->starttls ("connect") if $rscheme eq "https";
451
452	# handle actual, non-tunneled, request
453	my $handle_actual_request = sub {
454	$state{handle}->starttls ("connect") if $uscheme eq "https" && !exists $state{handle}{tls};
455
456	# send request
457	$state{handle}->push_write (
458	"$method $rpath HTTP/1.0\015\012"
459	. (join "", map "\u$_: $hdr{$_}\015\012", keys %hdr)
460	. "\015\012"
461	. (delete $arg{body})
462	);
463
464	%hdr = (); # reduce memory usage, save a kitten
465
466	# status line
467	$state{handle}->push_read (line => $qr_nl, sub {
468	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix
469	or return (%state = (), $cb->(undef, { Status => 599, Reason => "Invalid server response ($_[1])", URL => $url }));
470
471	my %hdr = ( # response headers
472	HTTPVersion => ",$1",
473	Status => ",$2",
474	Reason => ",$3",
475	URL => ",$url"
476	);
477
478	# headers, could be optimized a bit
479	$state{handle}->unshift_read (line => $qr_nlnl, sub {
480	for ("$_[1]\012") {
481	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
482
483	# things seen, not parsed:
484	# p3pP="NON CUR OTPi OUR NOR UNI"
485
486	$hdr{lc $1} .= ",$2"
487	while /\G
488	([^:\000-\037]+):
489	[\011\040]*
490	((?: [^\012]+ | \012[\011\040] )*)
491	\012
492	/gxc;
493
494	/\G$/
495	or return (%state = (), $cb->(undef, { Status => 599, Reason => "Garbled response headers", URL => $url }));
496	}
497
498	substr $_, 0, 1, ""
499	for values %hdr;
500
501	# redirect handling
502	# microsoft and other shitheads don't give a shit for following standards,
503	# try to support some common forms of broken Location headers.
504	if ($hdr{location} !~ /^(?: $ | [^:\/?\#]+ : )/x) {
505	$hdr{location} =~ s/^\.\/+//;
506
507	my $url = "$rscheme://$uhost:$uport";
508
509	unless ($hdr{location} =~ s/^\///) {
510	$url .= $upath;
511	$url =~ s/\/[^\/]*$//;
512	}
513
514	$hdr{location} = "$url/$hdr{location}";
515	}
516
517	my $redirect;
518
519	if ($recurse) {
520	if ($hdr{Status} =~ /^30[12]$/ && $method ne "POST") {
521	# apparently, mozilla et al. just change POST to GET here
522	# more research is needed before we do the same
523	$redirect = 1;
524	} elsif ($hdr{Status} == 303) {
525	# even http/1.1 is unclear on how to mutate the method
526	$method = "GET" unless $method eq "HEAD";
527	$redirect = 1;
528	} elsif ($hdr{Status} == 307 && $method =~ /^(?:GET|HEAD)$/) {
529	$redirect = 1;
530	}
531	}
532
533	my $finish = sub {
534	$state{handle}->destroy if $state{handle};
535	%state = ();
536
537	# set-cookie processing
538	if ($arg{cookie_jar}) {
539	for ($_[1]{"set-cookie"}) {
540	# parse NAME=VALUE
541	my @kv;
542
543	while (/\G\s* ([^=;,[:space:]]+) \s*=\s* (?: "((?:[^\\"]+|\\.)*)" | ([^=;,[:space:]]*) )/gcxs) {
544	my $name = $1;
545	my $value = $3;
546
547	unless ($value) {
548	$value = $2;
549	$value =~ s/\\(.)/$1/gs;
550	}
551
552	push @kv, $name => $value;
553
554	last unless /\G\s*;/gc;
555	}
556
557	last unless @kv;
558
559	my $name = shift @kv;
560	my %kv = (value => shift @kv, @kv);
561
562	my $cdom;
563	my $cpath = (delete $kv{path}) || "/";
564
565	if (exists $kv{domain}) {
566	$cdom = delete $kv{domain};
567
568	$cdom =~ s/^\.?/./; # make sure it starts with a "."
569
570	next if $cdom =~ /\.$/;
571
572	# this is not rfc-like and not netscape-like. go figure.
573	my $ndots = $cdom =~ y/.//;
574	next if $ndots < ($cdom =~ /\.[^.][^.]\.[^.][^.]$/ ? 3 : 2);
575	} else {
576	$cdom = $uhost;
577	}
578
579	# store it
580	$arg{cookie_jar}{version} = 1;
581	$arg{cookie_jar}{$cdom}{$cpath}{$name} = \%kv;
582
583	redo if /\G\s*,/gc;
584	}
585	}
586
587	if ($redirect) {
588	# we ignore any errors, as it is very common to receive
589	# Content-Length != 0 but no actual body
590	# we also access %hdr, as $_[1] might be an erro
591	http_request ($method => $hdr{location}, %arg, recurse => $recurse - 1, $cb);
592	} else {
593	$cb->($_[0], $_[1]);
594	}
595	};
596
597	my $len = $hdr{"content-length"};
598
599	if (!$redirect && $arg{on_header} && !$arg{on_header}(\%hdr)) {
600	$finish->(undef, { Status => 598, Reason => "Request cancelled by on_header", URL => $url });
601	} elsif (
602	$hdr{Status} =~ /^(?:1..|204|304)$/
603	or $method eq "HEAD"
604	or (defined $len && !$len)
605	) {
606	# no body
607	$finish->("", \%hdr);
608	} else {
609	# body handling, four different code paths
610	# for want_body_handle, on_body (2x), normal (2x)
611	# we might read too much here, but it does not matter yet (no pers. connections)
612	if (!$redirect && $arg{want_body_handle}) {
613	$_[0]->on_eof (undef);
614	$_[0]->on_error (undef);
615	$_[0]->on_read (undef);
616
617	$finish->(delete $state{handle}, \%hdr);
618
619	} elsif ($arg{on_body}) {
620	$_[0]->on_error (sub { $finish->(undef, { Status => 599, Reason => $_[2], URL => $url }) });
621	if ($len) {
622	$_[0]->on_eof (undef);
623	$_[0]->on_read (sub {
624	$len -= length $_[0]{rbuf};
625
626	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
627	or $finish->(undef, { Status => 598, Reason => "Request cancelled by on_body", URL => $url });
628
629	$len > 0
630	or $finish->("", \%hdr);
631	});
632	} else {
633	$_[0]->on_eof (sub {
634	$finish->("", \%hdr);
635	});
636	$_[0]->on_read (sub {
637	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
638	or $finish->(undef, { Status => 598, Reason => "Request cancelled by on_body", URL => $url });
639	});
640	}
641	} else {
642	$_[0]->on_eof (undef);
643
644	if ($len) {
645	$_[0]->on_error (sub { $finish->(undef, { Status => 599, Reason => $_[2], URL => $url }) });
646	$_[0]->on_read (sub {
647	$finish->((substr delete $_[0]{rbuf}, 0, $len, ""), \%hdr)
648	if $len <= length $_[0]{rbuf};
649	});
650	} else {
651	$_[0]->on_error (sub {
652	$! == Errno::EPIPE
653	? $finish->(delete $_[0]{rbuf}, \%hdr)
654	: $finish->(undef, { Status => 599, Reason => $_[2], URL => $url });
655	});
656	$_[0]->on_read (sub { });
657	}
658	}
659	}
660	});
661	});
662	};
663
664	# now handle proxy-CONNECT method
665	if ($proxy && $uscheme eq "https") {
666	# oh dear, we have to wrap it into a connect request
667
668	# maybe re-use $uauthority with patched port?
669	$state{handle}->push_write ("CONNECT $uhost:$uport HTTP/1.0\015\012Host: $uhost\015\012\015\012");
670	$state{handle}->push_read (line => $qr_nlnl, sub {
671	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix
672	or return (%state = (), $cb->(undef, { Status => 599, Reason => "Invalid proxy connect response ($_[1])", URL => $url }));
673
674	if ($2 == 200) {
675	$rpath = $upath;
676	&$handle_actual_request;
677	} else {
678	%state = ();
679	$cb->(undef, { Status => $2, Reason => $3, URL => $url });
680	}
681	});
682	} else {
683	&$handle_actual_request;
684	}
685
686	}, sub {
687	$timeout
688	};	1222	}
689	};	1223	};
690		1224
691	defined wantarray && AnyEvent::Util::guard { %state = () }	1225	defined wantarray && AnyEvent::Util::guard { _destroy_state %state }
692	}	1226	}
693		1227
694	sub http_get($@) {	1228	sub http_get($@) {
695	unshift @_, "GET";	1229	unshift @_, "GET";
696	&http_request	1230	&http_request
…		…
707	&http_request	1241	&http_request
708	}	1242	}
709		1243
710	=back	1244	=back
711		1245
		1246	=head2 DNS CACHING
		1247
		1248	AnyEvent::HTTP uses the AnyEvent::Socket::tcp_connect function for
		1249	the actual connection, which in turn uses AnyEvent::DNS to resolve
		1250	hostnames. The latter is a simple stub resolver and does no caching
		1251	on its own. If you want DNS caching, you currently have to provide
		1252	your own default resolver (by storing a suitable resolver object in
		1253	C<$AnyEvent::DNS::RESOLVER>) or your own C<tcp_connect> callback.
		1254
712	=head2 GLOBAL FUNCTIONS AND VARIABLES	1255	=head2 GLOBAL FUNCTIONS AND VARIABLES
713		1256
714	=over 4	1257	=over 4
715		1258
716	=item AnyEvent::HTTP::set_proxy "proxy-url"	1259	=item AnyEvent::HTTP::set_proxy "proxy-url"
717		1260
718	Sets the default proxy server to use. The proxy-url must begin with a	1261	Sets the default proxy server to use. The proxy-url must begin with a
719	string of the form C<http://host:port> (optionally C<https:...>).	1262	string of the form C<http://host:port>, croaks otherwise.
		1263
		1264	To clear an already-set proxy, use C<undef>.
		1265
		1266	When AnyEvent::HTTP is loaded for the first time it will query the
		1267	default proxy from the operating system, currently by looking at
		1268	C<$ENV{http_proxy>}.
		1269
		1270	=item AnyEvent::HTTP::cookie_jar_expire $jar[, $session_end]
		1271
		1272	Remove all cookies from the cookie jar that have been expired. If
		1273	C<$session_end> is given and true, then additionally remove all session
		1274	cookies.
		1275
		1276	You should call this function (with a true C<$session_end>) before you
		1277	save cookies to disk, and you should call this function after loading them
		1278	again. If you have a long-running program you can additionally call this
		1279	function from time to time.
		1280
		1281	A cookie jar is initially an empty hash-reference that is managed by this
		1282	module. It's format is subject to change, but currently it is like this:
		1283
		1284	The key C<version> has to contain C<1>, otherwise the hash gets
		1285	emptied. All other keys are hostnames or IP addresses pointing to
		1286	hash-references. The key for these inner hash references is the
		1287	server path for which this cookie is meant, and the values are again
		1288	hash-references. Each key of those hash-references is a cookie name, and
		1289	the value, you guessed it, is another hash-reference, this time with the
		1290	key-value pairs from the cookie, except for C<expires> and C<max-age>,
		1291	which have been replaced by a C<_expires> key that contains the cookie
		1292	expiry timestamp. Session cookies are indicated by not having an
		1293	C<_expires> key.
		1294
		1295	Here is an example of a cookie jar with a single cookie, so you have a
		1296	chance of understanding the above paragraph:
		1297
		1298	{
		1299	version => 1,
		1300	"10.0.0.1" => {
		1301	"/" => {
		1302	"mythweb_id" => {
		1303	_expires => 1293917923,
		1304	value => "ooRung9dThee3ooyXooM1Ohm",
		1305	},
		1306	},
		1307	},
		1308	}
		1309
		1310	=item $date = AnyEvent::HTTP::format_date $timestamp
		1311
		1312	Takes a POSIX timestamp (seconds since the epoch) and formats it as a HTTP
		1313	Date (RFC 2616).
		1314
		1315	=item $timestamp = AnyEvent::HTTP::parse_date $date
		1316
		1317	Takes a HTTP Date (RFC 2616) or a Cookie date (netscape cookie spec) or a
		1318	bunch of minor variations of those, and returns the corresponding POSIX
		1319	timestamp, or C<undef> if the date cannot be parsed.
720		1320
721	=item $AnyEvent::HTTP::MAX_RECURSE	1321	=item $AnyEvent::HTTP::MAX_RECURSE
722		1322
723	The default value for the C<recurse> request parameter (default: C<10>).	1323	The default value for the C<recurse> request parameter (default: C<10>).
		1324
		1325	=item $AnyEvent::HTTP::TIMEOUT
		1326
		1327	The default timeout for connection operations (default: C<300>).
724		1328
725	=item $AnyEvent::HTTP::USERAGENT	1329	=item $AnyEvent::HTTP::USERAGENT
726		1330
727	The default value for the C<User-Agent> header (the default is	1331	The default value for the C<User-Agent> header (the default is
728	C<Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>).	1332	C<Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>).
729		1333
730	=item $AnyEvent::HTTP::MAX_PERSISTENT	1334	=item $AnyEvent::HTTP::MAX_PER_HOST
731		1335
732	The maximum number of persistent connections to keep open (default: 8).	1336	The maximum number of concurrent connections to the same host (identified
		1337	by the hostname). If the limit is exceeded, then the additional requests
		1338	are queued until previous connections are closed. Both persistent and
		1339	non-persistent connections are counted in this limit.
733		1340
734	Not implemented currently.	1341	The default value for this is C<4>, and it is highly advisable to not
		1342	increase it much.
		1343
		1344	For comparison: the RFC's recommend 4 non-persistent or 2 persistent
		1345	connections, older browsers used 2, newer ones (such as firefox 3)
		1346	typically use 6, and Opera uses 8 because like, they have the fastest
		1347	browser and give a shit for everybody else on the planet.
735		1348
736	=item $AnyEvent::HTTP::PERSISTENT_TIMEOUT	1349	=item $AnyEvent::HTTP::PERSISTENT_TIMEOUT
737		1350
738	The maximum time to cache a persistent connection, in seconds (default: 2).	1351	The time after which idle persistent connections get closed by
739		1352	AnyEvent::HTTP (default: C<3>).
740	Not implemented currently.
741		1353
742	=item $AnyEvent::HTTP::ACTIVE	1354	=item $AnyEvent::HTTP::ACTIVE
743		1355
744	The number of active connections. This is not the number of currently	1356	The number of active connections. This is not the number of currently
745	running requests, but the number of currently open and non-idle TCP	1357	running requests, but the number of currently open and non-idle TCP
746	connections. This number of can be useful for load-leveling.	1358	connections. This number can be useful for load-leveling.
747		1359
748	=back	1360	=back
749		1361
750	=cut	1362	=cut
751		1363
		1364	our @month = qw(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec);
		1365	our @weekday = qw(Sun Mon Tue Wed Thu Fri Sat);
		1366
		1367	sub format_date($) {
		1368	my ($time) = @_;
		1369
		1370	# RFC 822/1123 format
		1371	my ($S, $M, $H, $mday, $mon, $year, $wday, $yday, undef) = gmtime $time;
		1372
		1373	sprintf "%s, %02d %s %04d %02d:%02d:%02d GMT",
		1374	$weekday[$wday], $mday, $month[$mon], $year + 1900,
		1375	$H, $M, $S;
		1376	}
		1377
		1378	sub parse_date($) {
		1379	my ($date) = @_;
		1380
		1381	my ($d, $m, $y, $H, $M, $S);
		1382
		1383	if ($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$/) {
		1384	# RFC 822/1123, required by RFC 2616 (with " ")
		1385	# cookie dates (with "-")
		1386
		1387	($d, $m, $y, $H, $M, $S) = ($1, $2, $3, $4, $5, $6);
		1388
		1389	} elsif ($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$/) {
		1390	# RFC 850
		1391	($d, $m, $y, $H, $M, $S) = ($1, $2, $3 < 69 ? $3 + 2000 : $3 + 1900, $4, $5, $6);
		1392
		1393	} elsif ($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])$/) {
		1394	# ISO C's asctime
		1395	($d, $m, $y, $H, $M, $S) = ($2, $1, $6, $3, $4, $5);
		1396	}
		1397	# other formats fail in the loop below
		1398
		1399	for (0..11) {
		1400	if ($m eq $month[$_]) {
		1401	require Time::Local;
		1402	return eval { Time::Local::timegm ($S, $M, $H, $d, $_, $y) };
		1403	}
		1404	}
		1405
		1406	undef
		1407	}
		1408
752	sub set_proxy($) {	1409	sub set_proxy($) {
753	$PROXY = [$2, $3 || 3128, $1] if $_[0] =~ m%^(https?):// ([^:/]+) (?: : (\d*) )?%ix;	1410	if (length $_[0]) {
		1411	$_[0] =~ m%^(http):// ([^:/]+) (?: : (\d*) )?%ix
		1412	or Carp::croak "$_[0]: invalid proxy URL";
		1413	$PROXY = [$2, $3 || 3128, $1]
		1414	} else {
		1415	undef $PROXY;
		1416	}
754	}	1417	}
755		1418
756	# initialise proxy from environment	1419	# initialise proxy from environment
		1420	eval {
757	set_proxy $ENV{http_proxy};	1421	set_proxy $ENV{http_proxy};
		1422	};
		1423
		1424	=head2 SHOWCASE
		1425
		1426	This section contains some more elaborate "real-world" examples or code
		1427	snippets.
		1428
		1429	=head2 HTTP/1.1 FILE DOWNLOAD
		1430
		1431	Downloading files with HTTP can be quite tricky, especially when something
		1432	goes wrong and you want to resume.
		1433
		1434	Here is a function that initiates and resumes a download. It uses the
		1435	last modified time to check for file content changes, and works with many
		1436	HTTP/1.0 servers as well, and usually falls back to a complete re-download
		1437	on older servers.
		1438
		1439	It calls the completion callback with either C<undef>, which means a
		1440	nonretryable error occurred, C<0> when the download was partial and should
		1441	be retried, and C<1> if it was successful.
		1442
		1443	use AnyEvent::HTTP;
		1444
		1445	sub download($$$) {
		1446	my ($url, $file, $cb) = @_;
		1447
		1448	open my $fh, "+<", $file
		1449	or die "$file: $!";
		1450
		1451	my %hdr;
		1452	my $ofs = 0;
		1453
		1454	warn stat $fh;
		1455	warn -s _;
		1456	if (stat $fh and -s _) {
		1457	$ofs = -s _;
		1458	warn "-s is ", $ofs;
		1459	$hdr{"if-unmodified-since"} = AnyEvent::HTTP::format_date +(stat _)[9];
		1460	$hdr{"range"} = "bytes=$ofs-";
		1461	}
		1462
		1463	http_get $url,
		1464	headers => \%hdr,
		1465	on_header => sub {
		1466	my ($hdr) = @_;
		1467
		1468	if ($hdr->{Status} == 200 && $ofs) {
		1469	# resume failed
		1470	truncate $fh, $ofs = 0;
		1471	}
		1472
		1473	sysseek $fh, $ofs, 0;
		1474
		1475	1
		1476	},
		1477	on_body => sub {
		1478	my ($data, $hdr) = @_;
		1479
		1480	if ($hdr->{Status} =~ /^2/) {
		1481	length $data == syswrite $fh, $data
		1482	or return; # abort on write errors
		1483	}
		1484
		1485	1
		1486	},
		1487	sub {
		1488	my (undef, $hdr) = @_;
		1489
		1490	my $status = $hdr->{Status};
		1491
		1492	if (my $time = AnyEvent::HTTP::parse_date $hdr->{"last-modified"}) {
		1493	utime $fh, $time, $time;
		1494	}
		1495
		1496	if ($status == 200 || $status == 206 || $status == 416) {
		1497	# download ok || resume ok || file already fully downloaded
		1498	$cb->(1, $hdr);
		1499
		1500	} elsif ($status == 412) {
		1501	# file has changed while resuming, delete and retry
		1502	unlink $file;
		1503	$cb->(0, $hdr);
		1504
		1505	} elsif ($status == 500 or $status == 503 or $status =~ /^59/) {
		1506	# retry later
		1507	$cb->(0, $hdr);
		1508
		1509	} else {
		1510	$cb->(undef, $hdr);
		1511	}
		1512	}
		1513	;
		1514	}
		1515
		1516	download "http://server/somelargefile", "/tmp/somelargefile", sub {
		1517	if ($_[0]) {
		1518	print "OK!\n";
		1519	} elsif (defined $_[0]) {
		1520	print "please retry later\n";
		1521	} else {
		1522	print "ERROR\n";
		1523	}
		1524	};
		1525
		1526	=head3 SOCKS PROXIES
		1527
		1528	Socks proxies are not directly supported by AnyEvent::HTTP. You can
		1529	compile your perl to support socks, or use an external program such as
		1530	F<socksify> (dante) or F<tsocks> to make your program use a socks proxy
		1531	transparently.
		1532
		1533	Alternatively, for AnyEvent::HTTP only, you can use your own
		1534	C<tcp_connect> function that does the proxy handshake - here is an example
		1535	that works with socks4a proxies:
		1536
		1537	use Errno;
		1538	use AnyEvent::Util;
		1539	use AnyEvent::Socket;
		1540	use AnyEvent::Handle;
		1541
		1542	# host, port and username of/for your socks4a proxy
		1543	my $socks_host = "10.0.0.23";
		1544	my $socks_port = 9050;
		1545	my $socks_user = "";
		1546
		1547	sub socks4a_connect {
		1548	my ($host, $port, $connect_cb, $prepare_cb) = @_;
		1549
		1550	my $hdl = new AnyEvent::Handle
		1551	connect => [$socks_host, $socks_port],
		1552	on_prepare => sub { $prepare_cb->($_[0]{fh}) },
		1553	on_error => sub { $connect_cb->() },
		1554	;
		1555
		1556	$hdl->push_write (pack "CCnNZ*Z*", 4, 1, $port, 1, $socks_user, $host);
		1557
		1558	$hdl->push_read (chunk => 8, sub {
		1559	my ($hdl, $chunk) = @_;
		1560	my ($status, $port, $ipn) = unpack "xCna4", $chunk;
		1561
		1562	if ($status == 0x5a) {
		1563	$connect_cb->($hdl->{fh}, (format_address $ipn) . ":$port");
		1564	} else {
		1565	$! = Errno::ENXIO; $connect_cb->();
		1566	}
		1567	});
		1568
		1569	$hdl
		1570	}
		1571
		1572	Use C<socks4a_connect> instead of C<tcp_connect> when doing C<http_request>s,
		1573	possibly after switching off other proxy types:
		1574
		1575	AnyEvent::HTTP::set_proxy undef; # usually you do not want other proxies
		1576
		1577	http_get 'http://www.google.com', tcp_connect => \&socks4a_connect, sub {
		1578	my ($data, $headers) = @_;
		1579	...
		1580	};
758		1581
759	=head1 SEE ALSO	1582	=head1 SEE ALSO
760		1583
761	L<AnyEvent>.	1584	L<AnyEvent>.
762		1585

Diff Legend

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