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Comparing AnyEvent-HTTP/HTTP.pm (file contents):
Revision 1.68 by root, Fri Dec 31 19:22:18 2010 UTC vs.
Revision 1.136 by root, Wed Oct 16 01:20:02 2019 UTC

…		…
15	This module is an L<AnyEvent> user, you need to make sure that you use and	15	This module is an L<AnyEvent> user, you need to make sure that you use and
16	run a supported event loop.	16	run a supported event loop.
17		17
18	This module implements a simple, stateless and non-blocking HTTP	18	This module implements a simple, stateless and non-blocking HTTP
19	client. It supports GET, POST and other request methods, cookies and more,	19	client. It supports GET, POST and other request methods, cookies and more,
20	all on a very low level. It can follow redirects supports proxies and	20	all on a very low level. It can follow redirects, supports proxies, and
21	automatically limits the number of connections to the values specified in	21	automatically limits the number of connections to the values specified in
22	the RFC.	22	the RFC.
23		23
24	It should generally be a "good client" that is enough for most HTTP	24	It should generally be a "good client" that is enough for most HTTP
25	tasks. Simple tasks should be simple, but complex tasks should still be	25	tasks. Simple tasks should be simple, but complex tasks should still be
…		…
36		36
37	=cut	37	=cut
38		38
39	package AnyEvent::HTTP;	39	package AnyEvent::HTTP;
40		40
41	use strict;	41	use common::sense;
42	no warnings;
43		42
44	use Errno ();	43	use Errno ();
45		44
46	use AnyEvent 5.0 ();	45	use AnyEvent 5.0 ();
47	use AnyEvent::Util ();	46	use AnyEvent::Util ();
48	use AnyEvent::Handle ();	47	use AnyEvent::Handle ();
49		48
50	use base Exporter::;	49	use base Exporter::;
51		50
52	our $VERSION = '1.5';	51	our $VERSION = 2.24;
53		52
54	our @EXPORT = qw(http_get http_post http_head http_request);	53	our @EXPORT = qw(http_get http_post http_head http_request);
55		54
56	our $USERAGENT = "Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)";	55	our $USERAGENT = "Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)";
57	our $MAX_RECURSE = 10;	56	our $MAX_RECURSE = 10;
58	our $MAX_PERSISTENT = 8;
59	our $PERSISTENT_TIMEOUT = 2;	57	our $PERSISTENT_TIMEOUT = 3;
60	our $TIMEOUT = 300;	58	our $TIMEOUT = 300;
61		59	our $MAX_PER_HOST = 4; # changing this is evil
62	# changing these is evil
63	our $MAX_PERSISTENT_PER_HOST = 0;
64	our $MAX_PER_HOST = 4;
65		60
66	our $PROXY;	61	our $PROXY;
67	our $ACTIVE = 0;	62	our $ACTIVE = 0;
68		63
69	my %KA_COUNT; # number of open keep-alive connections per host	64	my %KA_CACHE; # indexed by uhost currently, points to [$handle...] array
70	my %CO_SLOT; # number of open connections, and wait queue, per host	65	my %CO_SLOT; # number of open connections, and wait queue, per host
71		66
72	=item http_get $url, key => value..., $cb->($data, $headers)	67	=item http_get $url, key => value..., $cb->($data, $headers)
73		68
74	Executes an HTTP-GET request. See the http_request function for details on	69	Executes an HTTP-GET request. See the http_request function for details on
…		…
94	C<http_request> returns a "cancellation guard" - you have to keep the	89	C<http_request> returns a "cancellation guard" - you have to keep the
95	object at least alive until the callback get called. If the object gets	90	object at least alive until the callback get called. If the object gets
96	destroyed before the callback is called, the request will be cancelled.	91	destroyed before the callback is called, the request will be cancelled.
97		92
98	The callback will be called with the response body data as first argument	93	The callback will be called with the response body data as first argument
99	(or C<undef> if an error occured), and a hash-ref with response headers	94	(or C<undef> if an error occurred), and a hash-ref with response headers
100	(and trailers) as second argument.	95	(and trailers) as second argument.
101		96
102	All the headers in that hash are lowercased. In addition to the response	97	All the headers in that hash are lowercased. In addition to the response
103	headers, the "pseudo-headers" (uppercase to avoid clashing with possible	98	headers, the "pseudo-headers" (uppercase to avoid clashing with possible
104	response headers) C<HTTPVersion>, C<Status> and C<Reason> contain the	99	response headers) C<HTTPVersion>, C<Status> and C<Reason> contain the
…		…
122		117
123	If the server sends a header multiple times, then their contents will be	118	If the server sends a header multiple times, then their contents will be
124	joined together with a comma (C<,>), as per the HTTP spec.	119	joined together with a comma (C<,>), as per the HTTP spec.
125		120
126	If an internal error occurs, such as not being able to resolve a hostname,	121	If an internal error occurs, such as not being able to resolve a hostname,
127	then C<$data> will be C<undef>, C<< $headers->{Status} >> will be C<59x>	122	then C<$data> will be C<undef>, C<< $headers->{Status} >> will be
128	(usually C<599>) and the C<Reason> pseudo-header will contain an error	123	C<590>-C<599> and the C<Reason> pseudo-header will contain an error
129	message.	124	message. Currently the following status codes are used:
		125
		126	=over 4
		127
		128	=item 595 - errors during connection establishment, proxy handshake.
		129
		130	=item 596 - errors during TLS negotiation, request sending and header processing.
		131
		132	=item 597 - errors during body receiving or processing.
		133
		134	=item 598 - user aborted request via C<on_header> or C<on_body>.
		135
		136	=item 599 - other, usually nonretryable, errors (garbled URL etc.).
		137
		138	=back
130		139
131	A typical callback might look like this:	140	A typical callback might look like this:
132		141
133	sub {	142	sub {
134	my ($body, $hdr) = @_;	143	my ($body, $hdr) = @_;
…		…
145		154
146	=over 4	155	=over 4
147		156
148	=item recurse => $count (default: $MAX_RECURSE)	157	=item recurse => $count (default: $MAX_RECURSE)
149		158
150	Whether to recurse requests or not, e.g. on redirects, authentication	159	Whether to recurse requests or not, e.g. on redirects, authentication and
151	retries and so on, and how often to do so.	160	other retries and so on, and how often to do so.
		161
		162	Only redirects to http and https URLs are supported. While most common
		163	redirection forms are handled entirely within this module, some require
		164	the use of the optional L<URI> module. If it is required but missing, then
		165	the request will fail with an error.
152		166
153	=item headers => hashref	167	=item headers => hashref
154		168
155	The request headers to use. Currently, C<http_request> may provide its own	169	The request headers to use. Currently, C<http_request> may provide its own
156	C<Host:>, C<Content-Length:>, C<Connection:> and C<Cookie:> headers and	170	C<Host:>, C<Content-Length:>, C<Connection:> and C<Cookie:> headers and
157	will provide defaults for C<TE:>, C<Referer:> and C<User-Agent:> (this can	171	will provide defaults at least for C<TE:>, C<Referer:> and C<User-Agent:>
158	be suppressed by using C<undef> for these headers in which case they won't	172	(this can be suppressed by using C<undef> for these headers in which case
159	be sent at all).	173	they won't be sent at all).
		174
		175	You really should provide your own C<User-Agent:> header value that is
		176	appropriate for your program - I wouldn't be surprised if the default
		177	AnyEvent string gets blocked by webservers sooner or later.
		178
		179	Also, make sure that your headers names and values do not contain any
		180	embedded newlines.
160		181
161	=item timeout => $seconds	182	=item timeout => $seconds
162		183
163	The time-out to use for various stages - each connect attempt will reset	184	The time-out to use for various stages - each connect attempt will reset
164	the timeout, as will read or write activity, i.e. this is not an overall	185	the timeout, as will read or write activity, i.e. this is not an overall
…		…
166		187
167	Default timeout is 5 minutes.	188	Default timeout is 5 minutes.
168		189
169	=item proxy => [$host, $port[, $scheme]] or undef	190	=item proxy => [$host, $port[, $scheme]] or undef
170		191
171	Use the given http proxy for all requests. If not specified, then the	192	Use the given http proxy for all requests, or no proxy if C<undef> is
172	default proxy (as specified by C<$ENV{http_proxy}>) is used.	193	used.
173		194
174	C<$scheme> must be either missing, C<http> for HTTP or C<https> for	195	C<$scheme> must be either missing or must be C<http> for HTTP.
175	HTTPS.	196
		197	If not specified, then the default proxy is used (see
		198	C<AnyEvent::HTTP::set_proxy>).
		199
		200	Currently, if your proxy requires authorization, you have to specify an
		201	appropriate "Proxy-Authorization" header in every request.
		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>.
176		207
177	=item body => $string	208	=item body => $string
178		209
179	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
180	this module might offer more options).	211	this module might offer more options).
…		…
182	=item cookie_jar => $hash_ref	213	=item cookie_jar => $hash_ref
183		214
184	Passing this parameter enables (simplified) cookie-processing, loosely	215	Passing this parameter enables (simplified) cookie-processing, loosely
185	based on the original netscape specification.	216	based on the original netscape specification.
186		217
187	The C<$hash_ref> must be an (initially empty) hash reference which will	218	The C<$hash_ref> must be an (initially empty) hash reference which
188	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
189	persistent storage with something like JSON or Storable, but this is not	220	to persistent storage with something like JSON or Storable - see the
190	recommended, as expiry times are currently being ignored.	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.
191		224
192	Note that this cookie implementation is not of very high quality, nor	225	Note that this cookie implementation is not meant to be complete. If
193	meant to be complete. If you want complete cookie management you have to	226	you want complete cookie management you have to do that on your
194	do that on your own. C<cookie_jar> is meant as a quick fix to get some	227	own. C<cookie_jar> is meant as a quick fix to get most cookie-using sites
195	cookie-using sites working. Cookies are a privacy disaster, do not use	228	working. Cookies are a privacy disaster, do not use them unless required
196	them unless required to.	229	to.
		230
		231	When cookie processing is enabled, the C<Cookie:> and C<Set-Cookie:>
		232	headers will be set and handled by this module, otherwise they will be
		233	left untouched.
197		234
198	=item tls_ctx => $scheme | $tls_ctx	235	=item tls_ctx => $scheme | $tls_ctx
199		236
200	Specifies the AnyEvent::TLS context to be used for https connections. This	237	Specifies the AnyEvent::TLS context to be used for https connections. This
201	parameter follows the same rules as the C<tls_ctx> parameter to	238	parameter follows the same rules as the C<tls_ctx> parameter to
…		…
205	verification) TLS context.	242	verification) TLS context.
206		243
207	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
208	me the page, no matter what".	245	me the page, no matter what".
209		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
210	=item on_prepare => $callback->($fh)	259	=item on_prepare => $callback->($fh)
211		260
212	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
213	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
214	overrides the prepare callback passed to C<AnyEvent::Socket::tcp_connect>	263	overrides the prepare callback passed to C<AnyEvent::Socket::tcp_connect>
215	and behaves exactly the same way (e.g. it has to provide a	264	and behaves exactly the same way (e.g. it has to provide a
216	timeout). See the description for the C<$prepare_cb> argument of	265	timeout). See the description for the C<$prepare_cb> argument of
217	C<AnyEvent::Socket::tcp_connect> for details.	266	C<AnyEvent::Socket::tcp_connect> for details.
218		267
…		…
221	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
222	establishes connections. Normally it uses L<AnyEvent::Socket::tcp_connect>	271	establishes connections. Normally it uses L<AnyEvent::Socket::tcp_connect>
223	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 -
224	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
225	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<$tcp_connect>
		279	function is incompatible with this kind of re-use, consider switching off
		280	C<persistent> connections and/or providing a C<sessionid> identifier.
226		281
227	There are probably lots of weird uses for this function, starting from	282	There are probably lots of weird uses for this function, starting from
228	tracing the hosts C<http_request> actually tries to connect, to (inexact	283	tracing the hosts C<http_request> actually tries to connect, to (inexact
229	but fast) host => IP address caching or even socks protocol support.	284	but fast) host => IP address caching or even socks protocol support.
230		285
…		…
283	called. Instead of the C<$body> argument containing the body data, the	338	called. Instead of the C<$body> argument containing the body data, the
284	callback will receive the L<AnyEvent::Handle> object associated with the	339	callback will receive the L<AnyEvent::Handle> object associated with the
285	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
286	(e.g. status C<304>), the empty string will be passed.	341	(e.g. status C<304>), the empty string will be passed.
287		342
288	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
289	a proxy, be a persistent connection etc., and configured in unspecified	344	to a proxy, be a persistent connection, use chunked transfer encoding
290	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
291	module anymore).	346	handle (it will not be used by this module anymore).
292		347
293	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
294	headers, an interactive protocol is used (typical example would be the	349	headers, an interactive protocol is used (typical example would be the
295	push-style twitter API which starts a JSON/XML stream).	350	push-style twitter API which starts a JSON/XML stream).
296		351
297	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
298	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 => $boolean
		374
		375	Only used when C<persistent> is also true. This parameter decides whether
		376	C<http_request> tries to handshake a HTTP/1.0-style keep-alive connection
		377	(as opposed to only a HTTP/1.1 persistent connection).
		378
		379	The default is true, except when using a proxy, in which case it defaults
		380	to false, as HTTP/1.0 proxies cannot support this in a meaningful way.
		381
		382	=item handle_params => { key => value ... }
		383
		384	The key-value pairs in this hash will be passed to any L<AnyEvent::Handle>
		385	constructor that is called - not all requests will create a handle, and
		386	sometimes more than one is created, so this parameter is only good for
		387	setting hints.
		388
		389	Example: set the maximum read size to 4096, to potentially conserve memory
		390	at the cost of speed.
		391
		392	handle_params => {
		393	max_read_size => 4096,
		394	},
299		395
300	=back	396	=back
301		397
302	Example: do a simple HTTP GET request for http://www.nethype.de/ and print	398	Example: do a simple HTTP GET request for http://www.nethype.de/ and print
303	the response body.	399	the response body.
…		…
309		405
310	Example: do a HTTP HEAD request on https://www.google.com/, use a	406	Example: do a HTTP HEAD request on https://www.google.com/, use a
311	timeout of 30 seconds.	407	timeout of 30 seconds.
312		408
313	http_request	409	http_request
314	GET => "https://www.google.com",	410	HEAD => "https://www.google.com",
		411	headers => { "user-agent" => "MySearchClient 1.0" },
315	timeout => 30,	412	timeout => 30,
316	sub {	413	sub {
317	my ($body, $hdr) = @_;	414	my ($body, $hdr) = @_;
318	use Data::Dumper;	415	use Data::Dumper;
319	print Dumper $hdr;	416	print Dumper $hdr;
…		…
329	};	426	};
330		427
331	undef $request;	428	undef $request;
332		429
333	=cut	430	=cut
		431
		432	#############################################################################
		433	# wait queue/slots
334		434
335	sub _slot_schedule;	435	sub _slot_schedule;
336	sub _slot_schedule($) {	436	sub _slot_schedule($) {
337	my $host = shift;	437	my $host = shift;
338		438
…		…
360	push @{ $CO_SLOT{$_[0]}[1] }, $_[1];	460	push @{ $CO_SLOT{$_[0]}[1] }, $_[1];
361		461
362	_slot_schedule $_[0];	462	_slot_schedule $_[0];
363	}	463	}
364		464
		465	#############################################################################
		466	# cookie handling
		467
		468	# expire cookies
		469	sub cookie_jar_expire($;$) {
		470	my ($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
		498	# extract cookies from jar
		499	sub cookie_jar_extract($$$$) {
		500	my ($jar, $scheme, $host, $path) = @_;
		501
		502	%$jar = () if $jar->{version} != 2;
		503
		504	$host = AnyEvent::Util::idn_to_ascii $host
		505	if $host =~ /[^\x00-\x7f]/;
		506
		507	my @cookies;
		508
		509	while (my ($chost, $paths) = each %$jar) {
		510	next unless ref $paths;
		511
		512	# exact match or suffix including . match
		513	$chost eq $host or ".$chost" eq substr $host, -1 - length $chost
		514	or next;
		515
		516	while (my ($cpath, $cookies) = each %$paths) {
		517	next unless $cpath eq substr $path, 0, length $cpath;
		518
		519	while (my ($cookie, $kv) = each %$cookies) {
		520	next if $scheme ne "https" && exists $kv->{secure};
		521
		522	if (exists $kv->{_expires} and AE::now > $kv->{_expires}) {
		523	delete $cookies->{$cookie};
		524	next;
		525	}
		526
		527	my $value = $kv->{value};
		528
		529	if ($value =~ /[=;,[:space:]]/) {
		530	$value =~ s/([\\"])/\\$1/g;
		531	$value = "\"$value\"";
		532	}
		533
		534	push @cookies, "$cookie=$value";
		535	}
		536	}
		537	}
		538
		539	\@cookies
		540	}
		541
		542	# parse set_cookie header into jar
		543	sub cookie_jar_set_cookie($$$$) {
		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
		550
		551	for ($set_cookie) {
		552	# parse NAME=VALUE
		553	my @kv;
		554
		555	# expires is not http-compliant in the original cookie-spec,
		556	# we support the official date format and some extensions
		557	while (
		558	m{
		559	\G\s*
		560	(?:
		561	expires \s*=\s* ([A-Z][a-z][a-z]+,\ [^,;]+)
		562	| ([^=;,[:space:]]+) (?: \s*=\s* (?: "((?:[^\\"]+|\\.)*)" | ([^;,[:space:]]*) ) )?
		563	)
		564	}gcxsi
		565	) {
		566	my $name = $2;
		567	my $value = $4;
		568
		569	if (defined $1) {
		570	# expires
		571	$name = "expires";
		572	$value = $1;
		573	} elsif (defined $3) {
		574	# quoted
		575	$value = $3;
		576	$value =~ s/\\(.)/$1/gs;
		577	}
		578
		579	push @kv, @kv ? lc $name : $name, $value;
		580
		581	last unless /\G\s*;/gc;
		582	}
		583
		584	last unless @kv;
		585
		586	my $name = shift @kv;
		587	my %kv = (value => shift @kv, @kv);
		588
		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	}
		597
		598	my $cdom;
		599	my $cpath = (delete $kv{path}) || "/";
		600
		601	if (exists $kv{domain}) {
		602	$cdom = $kv{domain};
		603
		604	$cdom =~ s/^\.?/./; # make sure it starts with a "."
		605
		606	next if $cdom =~ /\.$/;
		607
		608	# this is not rfc-like and not netscape-like. go figure.
		609	my $ndots = $cdom =~ y/.//;
		610	next if $ndots < ($cdom =~ /\.[^.][^.]\.[^.][^.]$/ ? 3 : 2);
		611
		612	$cdom = substr $cdom, 1; # remove initial .
		613	} else {
		614	$cdom = $host;
		615	}
		616
		617	# store it
		618	$jar->{version} = 2;
		619	$jar->{lc $cdom}{$cpath}{$name} = \%kv;
		620
		621	redo if /\G\s*,/gc;
		622	}
		623	}
		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
365	# continue to parse $_ for headers and place them into the arg	667	# continue to parse $_ for headers and place them into the arg
366	sub parse_hdr() {	668	sub _parse_hdr() {
367	my %hdr;	669	my %hdr;
368		670
369	# things seen, not parsed:	671	# things seen, not parsed:
370	# p3pP="NON CUR OTPi OUR NOR UNI"	672	# p3pP="NON CUR OTPi OUR NOR UNI"
371		673
…		…
385	for values %hdr;	687	for values %hdr;
386		688
387	\%hdr	689	\%hdr
388	}	690	}
389		691
		692	#############################################################################
		693	# http_get
		694
390	our $qr_nlnl = qr{(?<![^\012])\015?\012};	695	our $qr_nlnl = qr{(?<![^\012])\015?\012};
391		696
392	our $TLS_CTX_LOW = { cache => 1, sslv2 => 1 };	697	our $TLS_CTX_LOW = { cache => 1, sslv2 => 1 };
393	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(\%$$) {
		710	my ($state, $cb, $hdr) = @_;
		711
		712	&_destroy_state ($state);
		713
		714	$cb->(undef, $hdr);
		715	()
		716	}
		717
		718	our %IDEMPOTENT = (
		719	DELETE => 1,
		720	GET => 1,
		721	HEAD => 1,
		722	OPTIONS => 1,
		723	PUT => 1,
		724	TRACE => 1,
		725
		726	ACL => 1,
		727	"BASELINE-CONTROL" => 1,
		728	BIND => 1,
		729	CHECKIN => 1,
		730	CHECKOUT => 1,
		731	COPY => 1,
		732	LABEL => 1,
		733	LINK => 1,
		734	MERGE => 1,
		735	MKACTIVITY => 1,
		736	MKCALENDAR => 1,
		737	MKCOL => 1,
		738	MKREDIRECTREF => 1,
		739	MKWORKSPACE => 1,
		740	MOVE => 1,
		741	ORDERPATCH => 1,
		742	PROPFIND => 1,
		743	PROPPATCH => 1,
		744	REBIND => 1,
		745	REPORT => 1,
		746	SEARCH => 1,
		747	UNBIND => 1,
		748	UNCHECKOUT => 1,
		749	UNLINK => 1,
		750	UNLOCK => 1,
		751	UPDATE => 1,
		752	UPDATEREDIRECTREF => 1,
		753	"VERSION-CONTROL" => 1,
		754	);
394		755
395	sub http_request($$@) {	756	sub http_request($$@) {
396	my $cb = pop;	757	my $cb = pop;
397	my ($method, $url, %arg) = @_;	758	my ($method, $url, %arg) = @_;
398		759
…		…
416	my $recurse = exists $arg{recurse} ? delete $arg{recurse} : $MAX_RECURSE;	777	my $recurse = exists $arg{recurse} ? delete $arg{recurse} : $MAX_RECURSE;
417		778
418	return $cb->(undef, { @pseudo, Status => 599, Reason => "Too many redirections" })	779	return $cb->(undef, { @pseudo, Status => 599, Reason => "Too many redirections" })
419	if $recurse < 0;	780	if $recurse < 0;
420		781
421	my $proxy = $arg{proxy} || $PROXY;	782	my $proxy = exists $arg{proxy} ? $arg{proxy} : $PROXY;
422	my $timeout = $arg{timeout} || $TIMEOUT;	783	my $timeout = $arg{timeout} || $TIMEOUT;
423		784
424	my ($uscheme, $uauthority, $upath, $query, $fragment) =	785	my ($uscheme, $uauthority, $upath, $query, undef) = # ignore fragment
425	$url =~ m|(?:([^:/?#]+):)?(?://([^/?#]*))?([^?#]*)(?:(\?[^#]*))?(?:#(.*))?|;	786	$url =~ m|^([^:]+):(?://([^/?#]*))?([^?#]*)(?:(\?[^#]*))?(?:#(.*))?$|;
426		787
427	$uscheme = lc $uscheme;	788	$uscheme = lc $uscheme;
428		789
429	my $uport = $uscheme eq "http" ? 80	790	my $uport = $uscheme eq "http" ? 80
430	: $uscheme eq "https" ? 443	791	: $uscheme eq "https" ? 443
431	: return $cb->(undef, { @pseudo, Status => 599, Reason => "Only http and https URL schemes supported" });	792	: return $cb->(undef, { @pseudo, Status => 599, Reason => "Only http and https URL schemes supported" });
432		793
433	$uauthority =~ /^(?: .*\@ )? ([^\@:]+) (?: : (\d+) )?$/x	794	$uauthority =~ /^(?: .*\@ )? ([^\@]+?) (?: : (\d+) )?$/x
434	or return $cb->(undef, { @pseudo, Status => 599, Reason => "Unparsable URL" });	795	or return $cb->(undef, { @pseudo, Status => 599, Reason => "Unparsable URL" });
435		796
436	my $uhost = $1;	797	my $uhost = lc $1;
437	$uport = $2 if defined $2;	798	$uport = $2 if defined $2;
438		799
439	$hdr{host} = defined $2 ? "$uhost:$2" : "$uhost"	800	$hdr{host} = defined $2 ? "$uhost:$2" : "$uhost"
440	unless exists $hdr{host};	801	unless exists $hdr{host};
441		802
…		…
444		805
445	$upath =~ s%^/?%/%;	806	$upath =~ s%^/?%/%;
446		807
447	# cookie processing	808	# cookie processing
448	if (my $jar = $arg{cookie_jar}) {	809	if (my $jar = $arg{cookie_jar}) {
449	%$jar = () if $jar->{version} != 1;	810	my $cookies = cookie_jar_extract $jar, $uscheme, $uhost, $upath;
450		811
451	my @cookie;
452
453	while (my ($chost, $v) = each %$jar) {
454	if ($chost =~ /^\./) {
455	next unless $chost eq substr $uhost, -length $chost;
456	} elsif ($chost =~ /\./) {
457	next unless $chost eq $uhost;
458	} else {
459	next;
460	}
461
462	while (my ($cpath, $v) = each %$v) {
463	next unless $cpath eq substr $upath, 0, length $cpath;
464
465	while (my ($k, $v) = each %$v) {
466	next if $uscheme ne "https" && exists $v->{secure};
467	my $value = $v->{value};
468	$value =~ s/([\\"])/\\$1/g;
469	push @cookie, "$k=\"$value\"";
470	}
471	}
472	}
473
474	$hdr{cookie} = join "; ", @cookie	812	$hdr{cookie} = join "; ", @$cookies
475	if @cookie;	813	if @$cookies;
476	}	814	}
477		815
478	my ($rhost, $rport, $rscheme, $rpath); # request host, port, path	816	my ($rhost, $rport, $rscheme, $rpath); # request host, port, path
479		817
480	if ($proxy) {	818	if ($proxy) {
…		…
483	$rscheme = "http" unless defined $rscheme;	821	$rscheme = "http" unless defined $rscheme;
484		822
485	# don't support https requests over https-proxy transport,	823	# don't support https requests over https-proxy transport,
486	# can't be done with tls as spec'ed, unless you double-encrypt.	824	# can't be done with tls as spec'ed, unless you double-encrypt.
487	$rscheme = "http" if $uscheme eq "https" && $rscheme eq "https";	825	$rscheme = "http" if $uscheme eq "https" && $rscheme eq "https";
		826
		827	$rhost = lc $rhost;
		828	$rscheme = lc $rscheme;
488	} else {	829	} else {
489	($rhost, $rport, $rscheme, $rpath) = ($uhost, $uport, $uscheme, $upath);	830	($rhost, $rport, $rscheme, $rpath) = ($uhost, $uport, $uscheme, $upath);
490	}	831	}
491		832
492	# leave out fragment and query string, just a heuristic	833	# leave out fragment and query string, just a heuristic
…		…
494	$hdr{"user-agent"} = $USERAGENT unless exists $hdr{"user-agent"};	835	$hdr{"user-agent"} = $USERAGENT unless exists $hdr{"user-agent"};
495		836
496	$hdr{"content-length"} = length $arg{body}	837	$hdr{"content-length"} = length $arg{body}
497	if length $arg{body} || $method ne "GET";	838	if length $arg{body} || $method ne "GET";
498		839
499	$hdr{connection} = "close TE"; #1.1	840	my $idempotent = $IDEMPOTENT{$method};
		841
		842	# default value for keepalive is true iff the request is for an idempotent method
		843	my $persistent = exists $arg{persistent} ? !!$arg{persistent} : $idempotent;
		844	my $keepalive = exists $arg{keepalive} ? !!$arg{keepalive} : !$proxy;
		845	my $was_persistent; # true if this is actually a recycled connection
		846
		847	# the key to use in the keepalive cache
		848	my $ka_key = "$uscheme\x00$uhost\x00$uport\x00$arg{sessionid}";
		849
		850	$hdr{connection} = ($persistent ? $keepalive ? "keep-alive, " : "" : "close, ") . "Te"; #1.1
500	$hdr{te} = "trailers" unless exists $hdr{te}; #1.1	851	$hdr{te} = "trailers" unless exists $hdr{te}; #1.1
501		852
502	my %state = (connect_guard => 1);	853	my %state = (connect_guard => 1);
		854
		855	my $ae_error = 595; # connecting
		856
		857	# handle actual, non-tunneled, request
		858	my $handle_actual_request = sub {
		859	$ae_error = 596; # request phase
		860
		861	my $hdl = $state{handle};
		862
		863	$hdl->starttls ("connect") if $uscheme eq "https" && !exists $hdl->{tls};
		864
		865	# send request
		866	$hdl->push_write (
		867	"$method $rpath HTTP/1.1\015\012"
		868	. (join "", map "\u$_: $hdr{$_}\015\012", grep defined $hdr{$_}, keys %hdr)
		869	. "\015\012"
		870	. $arg{body}
		871	);
		872
		873	# return if error occurred during push_write()
		874	return unless %state;
		875
		876	# reduce memory usage, save a kitten, also re-use it for the response headers.
		877	%hdr = ();
		878
		879	# status line and headers
		880	$state{read_response} = sub {
		881	return unless %state;
		882
		883	for ("$_[1]") {
		884	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
		885
		886	/^HTTP\/0*([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\012]*) )? \012/gxci
		887	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Invalid server response" };
		888
		889	# 100 Continue handling
		890	# should not happen as we don't send expect: 100-continue,
		891	# but we handle it just in case.
		892	# since we send the request body regardless, if we get an error
		893	# we are out of-sync, which we currently do NOT handle correctly.
		894	return $state{handle}->push_read (line => $qr_nlnl, $state{read_response})
		895	if $2 eq 100;
		896
		897	push @pseudo,
		898	HTTPVersion => $1,
		899	Status => $2,
		900	Reason => $3,
		901	;
		902
		903	my $hdr = _parse_hdr
		904	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Garbled response headers" };
		905
		906	%hdr = (%$hdr, @pseudo);
		907	}
		908
		909	# redirect handling
		910	# relative uri handling forced by microsoft and other shitheads.
		911	# we give our best and fall back to URI if available.
		912	if (exists $hdr{location}) {
		913	my $loc = $hdr{location};
		914
		915	if ($loc =~ m%^//%) { # //
		916	$loc = "$uscheme:$loc";
		917
		918	} elsif ($loc eq "") {
		919	$loc = $url;
		920
		921	} elsif ($loc !~ /^(?: $ | [^:\/?\#]+ : )/x) { # anything "simple"
		922	$loc =~ s/^\.\/+//;
		923
		924	if ($loc !~ m%^[.?#]%) {
		925	my $prefix = "$uscheme://$uauthority";
		926
		927	unless ($loc =~ s/^\///) {
		928	$prefix .= $upath;
		929	$prefix =~ s/\/[^\/]*$//;
		930	}
		931
		932	$loc = "$prefix/$loc";
		933
		934	} elsif (eval { require URI }) { # uri
		935	$loc = URI->new_abs ($loc, $url)->as_string;
		936
		937	} else {
		938	return _error %state, $cb, { @pseudo, Status => 599, Reason => "Cannot parse Location (URI module missing)" };
		939	#$hdr{Status} = 599;
		940	#$hdr{Reason} = "Unparsable Redirect (URI module missing)";
		941	#$recurse = 0;
		942	}
		943	}
		944
		945	$hdr{location} = $loc;
		946	}
		947
		948	my $redirect;
		949
		950	if ($recurse) {
		951	my $status = $hdr{Status};
		952
		953	# industry standard is to redirect POST as GET for
		954	# 301, 302 and 303, in contrast to HTTP/1.0 and 1.1.
		955	# also, the UA should ask the user for 301 and 307 and POST,
		956	# industry standard seems to be to simply follow.
		957	# we go with the industry standard. 308 is defined
		958	# by rfc7538
		959	if ($status == 301 or $status == 302 or $status == 303) {
		960	$redirect = 1;
		961	# HTTP/1.1 is unclear on how to mutate the method
		962	unless ($method eq "HEAD") {
		963	$method = "GET";
		964	delete $arg{body};
		965	}
		966	} elsif ($status == 307 or $status == 308) {
		967	$redirect = 1;
		968	}
		969	}
		970
		971	my $finish = sub { # ($data, $err_status, $err_reason[, $persistent])
		972	if ($state{handle}) {
		973	# handle keepalive
		974	if (
		975	$persistent
		976	&& $_[3]
		977	&& ($hdr{HTTPVersion} < 1.1
		978	? $hdr{connection} =~ /\bkeep-?alive\b/i
		979	: $hdr{connection} !~ /\bclose\b/i)
		980	) {
		981	ka_store $ka_key, delete $state{handle};
		982	} else {
		983	# no keepalive, destroy the handle
		984	$state{handle}->destroy;
		985	}
		986	}
		987
		988	%state = ();
		989
		990	if (defined $_[1]) {
		991	$hdr{OrigStatus} = $hdr{Status}; $hdr{Status} = $_[1];
		992	$hdr{OrigReason} = $hdr{Reason}; $hdr{Reason} = $_[2];
		993	}
		994
		995	# set-cookie processing
		996	if ($arg{cookie_jar}) {
		997	cookie_jar_set_cookie $arg{cookie_jar}, $hdr{"set-cookie"}, $uhost, $hdr{date};
		998	}
		999
		1000	if ($redirect && exists $hdr{location}) {
		1001	# we ignore any errors, as it is very common to receive
		1002	# Content-Length != 0 but no actual body
		1003	# we also access %hdr, as $_[1] might be an erro
		1004	$state{recurse} =
		1005	http_request (
		1006	$method => $hdr{location},
		1007	%arg,
		1008	recurse => $recurse - 1,
		1009	Redirect => [$_[0], \%hdr],
		1010	sub {
		1011	%state = ();
		1012	&$cb
		1013	},
		1014	);
		1015	} else {
		1016	$cb->($_[0], \%hdr);
		1017	}
		1018	};
		1019
		1020	$ae_error = 597; # body phase
		1021
		1022	my $chunked = $hdr{"transfer-encoding"} =~ /\bchunked\b/i; # not quite correct...
		1023
		1024	my $len = $chunked ? undef : $hdr{"content-length"};
		1025
		1026	# body handling, many different code paths
		1027	# - no body expected
		1028	# - want_body_handle
		1029	# - te chunked
		1030	# - 2x length known (with or without on_body)
		1031	# - 2x length not known (with or without on_body)
		1032	if (!$redirect && $arg{on_header} && !$arg{on_header}(\%hdr)) {
		1033	$finish->(undef, 598 => "Request cancelled by on_header");
		1034	} elsif (
		1035	$hdr{Status} =~ /^(?:1..|204|205|304)$/
		1036	or $method eq "HEAD"
		1037	or (defined $len && $len == 0) # == 0, not !, because "0 " is true
		1038	) {
		1039	# no body
		1040	$finish->("", undef, undef, 1);
		1041
		1042	} elsif (!$redirect && $arg{want_body_handle}) {
		1043	$_[0]->on_eof (undef);
		1044	$_[0]->on_error (undef);
		1045	$_[0]->on_read (undef);
		1046
		1047	$finish->(delete $state{handle});
		1048
		1049	} elsif ($chunked) {
		1050	my $cl = 0;
		1051	my $body = "";
		1052	my $on_body = (!$redirect && $arg{on_body}) || sub { $body .= shift; 1 };
		1053
		1054	$state{read_chunk} = sub {
		1055	$_[1] =~ /^([0-9a-fA-F]+)/
		1056	or return $finish->(undef, $ae_error => "Garbled chunked transfer encoding");
		1057
		1058	my $len = hex $1;
		1059
		1060	if ($len) {
		1061	$cl += $len;
		1062
		1063	$_[0]->push_read (chunk => $len, sub {
		1064	$on_body->($_[1], \%hdr)
		1065	or return $finish->(undef, 598 => "Request cancelled by on_body");
		1066
		1067	$_[0]->push_read (line => sub {
		1068	length $_[1]
		1069	and return $finish->(undef, $ae_error => "Garbled chunked transfer encoding");
		1070	$_[0]->push_read (line => $state{read_chunk});
		1071	});
		1072	});
		1073	} else {
		1074	$hdr{"content-length"} ||= $cl;
		1075
		1076	$_[0]->push_read (line => $qr_nlnl, sub {
		1077	if (length $_[1]) {
		1078	for ("$_[1]") {
		1079	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
		1080
		1081	my $hdr = _parse_hdr
		1082	or return $finish->(undef, $ae_error => "Garbled response trailers");
		1083
		1084	%hdr = (%hdr, %$hdr);
		1085	}
		1086	}
		1087
		1088	$finish->($body, undef, undef, 1);
		1089	});
		1090	}
		1091	};
		1092
		1093	$_[0]->push_read (line => $state{read_chunk});
		1094
		1095	} elsif (!$redirect && $arg{on_body}) {
		1096	if (defined $len) {
		1097	$_[0]->on_read (sub {
		1098	$len -= length $_[0]{rbuf};
		1099
		1100	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
		1101	or return $finish->(undef, 598 => "Request cancelled by on_body");
		1102
		1103	$len > 0
		1104	or $finish->("", undef, undef, 1);
		1105	});
		1106	} else {
		1107	$_[0]->on_eof (sub {
		1108	$finish->("");
		1109	});
		1110	$_[0]->on_read (sub {
		1111	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
		1112	or $finish->(undef, 598 => "Request cancelled by on_body");
		1113	});
		1114	}
		1115	} else {
		1116	$_[0]->on_eof (undef);
		1117
		1118	if (defined $len) {
		1119	$_[0]->on_read (sub {
		1120	$finish->((substr delete $_[0]{rbuf}, 0, $len, ""), undef, undef, 1)
		1121	if $len <= length $_[0]{rbuf};
		1122	});
		1123	} else {
		1124	$_[0]->on_error (sub {
		1125	($! == Errno::EPIPE || !$!)
		1126	? $finish->(delete $_[0]{rbuf})
		1127	: $finish->(undef, $ae_error => $_[2]);
		1128	});
		1129	$_[0]->on_read (sub { });
		1130	}
		1131	}
		1132	};
		1133
		1134	# if keepalive is enabled, then the server closing the connection
		1135	# before a response can happen legally - we retry on idempotent methods.
		1136	if ($was_persistent && $idempotent) {
		1137	my $old_eof = $hdl->{on_eof};
		1138	$hdl->{on_eof} = sub {
		1139	_destroy_state %state;
		1140
		1141	%state = ();
		1142	$state{recurse} =
		1143	http_request (
		1144	$method => $url,
		1145	%arg,
		1146	recurse => $recurse - 1,
		1147	persistent => 0,
		1148	sub {
		1149	%state = ();
		1150	&$cb
		1151	}
		1152	);
		1153	};
		1154	$hdl->on_read (sub {
		1155	return unless %state;
		1156
		1157	# as soon as we receive something, a connection close
		1158	# once more becomes a hard error
		1159	$hdl->{on_eof} = $old_eof;
		1160	$hdl->push_read (line => $qr_nlnl, $state{read_response});
		1161	});
		1162	} else {
		1163	$hdl->push_read (line => $qr_nlnl, $state{read_response});
		1164	}
		1165	};
		1166
		1167	my $prepare_handle = sub {
		1168	my ($hdl) = $state{handle};
		1169
		1170	$hdl->on_error (sub {
		1171	_error %state, $cb, { @pseudo, Status => $ae_error, Reason => $_[2] };
		1172	});
		1173	$hdl->on_eof (sub {
		1174	_error %state, $cb, { @pseudo, Status => $ae_error, Reason => "Unexpected end-of-file" };
		1175	});
		1176	$hdl->timeout_reset;
		1177	$hdl->timeout ($timeout);
		1178	};
		1179
		1180	# connected to proxy (or origin server)
		1181	my $connect_cb = sub {
		1182	my $fh = shift
		1183	or return _error %state, $cb, { @pseudo, Status => $ae_error, Reason => "$!" };
		1184
		1185	return unless delete $state{connect_guard};
		1186
		1187	# get handle
		1188	$state{handle} = new AnyEvent::Handle
		1189	%{ $arg{handle_params} },
		1190	fh => $fh,
		1191	peername => $uhost,
		1192	tls_ctx => $arg{tls_ctx},
		1193	;
		1194
		1195	$prepare_handle->();
		1196
		1197	#$state{handle}->starttls ("connect") if $rscheme eq "https";
		1198
		1199	# now handle proxy-CONNECT method
		1200	if ($proxy && $uscheme eq "https") {
		1201	# oh dear, we have to wrap it into a connect request
		1202
		1203	my $auth = exists $hdr{"proxy-authorization"}
		1204	? "proxy-authorization: " . (delete $hdr{"proxy-authorization"}) . "\015\012"
		1205	: "";
		1206
		1207	# maybe re-use $uauthority with patched port?
		1208	$state{handle}->push_write ("CONNECT $uhost:$uport HTTP/1.0\015\012$auth\015\012");
		1209	$state{handle}->push_read (line => $qr_nlnl, sub {
		1210	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix
		1211	or return _error %state, $cb, { @pseudo, Status => 599, Reason => "Invalid proxy connect response ($_[1])" };
		1212
		1213	if ($2 == 200) {
		1214	$rpath = $upath;
		1215	$handle_actual_request->();
		1216	} else {
		1217	_error %state, $cb, { @pseudo, Status => $2, Reason => $3 };
		1218	}
		1219	});
		1220	} else {
		1221	delete $hdr{"proxy-authorization"} unless $proxy;
		1222
		1223	$handle_actual_request->();
		1224	}
		1225	};
503		1226
504	_get_slot $uhost, sub {	1227	_get_slot $uhost, sub {
505	$state{slot_guard} = shift;	1228	$state{slot_guard} = shift;
506		1229
507	return unless $state{connect_guard};	1230	return unless $state{connect_guard};
508		1231
509	my $connect_cb = sub {	1232	# try to use an existing keepalive connection, but only if we, ourselves, plan
510	$state{fh} = shift	1233	# on a keepalive request (in theory, this should be a separate config option).
511	or do {	1234	if ($persistent && $KA_CACHE{$ka_key}) {
512	my $err = "$!";	1235	$was_persistent = 1;
513	%state = ();
514	return $cb->(undef, { @pseudo, Status => 599, Reason => $err });
515	};
516		1236
517	pop; # free memory, save a tree	1237	$state{handle} = ka_fetch $ka_key;
518		1238	# $state{handle}->destroyed
519	return unless delete $state{connect_guard};	1239	# and die "AnyEvent::HTTP: unexpectedly got a destructed handle (1), please report.";#d#
520		1240	$prepare_handle->();
521	# get handle	1241	# $state{handle}->destroyed
522	$state{handle} = new AnyEvent::Handle	1242	# and die "AnyEvent::HTTP: unexpectedly got a destructed handle (2), please report.";#d#
523	fh => $state{fh},
524	peername => $rhost,
525	tls_ctx => $arg{tls_ctx},
526	# these need to be reconfigured on keepalive handles
527	timeout => $timeout,
528	on_error => sub {
529	%state = ();
530	$cb->(undef, { @pseudo, Status => 599, Reason => $_[2] });
531	},
532	on_eof => sub {
533	%state = ();
534	$cb->(undef, { @pseudo, Status => 599, Reason => "Unexpected end-of-file" });
535	},
536	;
537
538	# limit the number of persistent connections
539	# keepalive not yet supported
540	# if ($KA_COUNT{$_[1]} < $MAX_PERSISTENT_PER_HOST) {
541	# ++$KA_COUNT{$_[1]};
542	# $state{handle}{ka_count_guard} = AnyEvent::Util::guard {
543	# --$KA_COUNT{$_[1]}
544	# };
545	# $hdr{connection} = "keep-alive";
546	# }
547
548	$state{handle}->starttls ("connect") if $rscheme eq "https";
549
550	# handle actual, non-tunneled, request
551	my $handle_actual_request = sub {
552	$state{handle}->starttls ("connect") if $uscheme eq "https" && !exists $state{handle}{tls};
553
554	# send request
555	$state{handle}->push_write (
556	"$method $rpath HTTP/1.1\015\012"
557	. (join "", map "\u$_: $hdr{$_}\015\012", grep defined $hdr{$_}, keys %hdr)
558	. "\015\012"
559	. (delete $arg{body})
560	);
561
562	# return if error occured during push_write()
563	return unless %state;
564
565	%hdr = (); # reduce memory usage, save a kitten, also make it possible to re-use
566
567	# status line and headers
568	$state{read_response} = sub {
569	for ("$_[1]") {
570	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
571
572	/^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\012]*) )? \012/igxc
573	or return (%state = (), $cb->(undef, { @pseudo, Status => 599, Reason => "Invalid server response" }));
574
575	# 100 Continue handling
576	# should not happen as we don't send expect: 100-continue,
577	# but we handle it just in case.
578	# since we send the request body regardless, if we get an error
579	# we are out of-sync, which we currently do NOT handle correctly.
580	return $state{handle}->push_read (line => $qr_nlnl, $state{read_response})
581	if $2 eq 100;
582
583	push @pseudo,
584	HTTPVersion => $1,
585	Status => $2,
586	Reason => $3,
587	;
588
589	my $hdr = parse_hdr
590	or return (%state = (), $cb->(undef, { @pseudo, Status => 599, Reason => "Garbled response headers" }));
591
592	%hdr = (%$hdr, @pseudo);
593	}
594
595	# redirect handling
596	# microsoft and other shitheads don't give a shit for following standards,
597	# try to support some common forms of broken Location headers.
598	if ($hdr{location} !~ /^(?: $ | [^:\/?\#]+ : )/x) {
599	$hdr{location} =~ s/^\.\/+//;
600
601	my $url = "$rscheme://$uhost:$uport";
602
603	unless ($hdr{location} =~ s/^\///) {
604	$url .= $upath;
605	$url =~ s/\/[^\/]*$//;
606	}
607
608	$hdr{location} = "$url/$hdr{location}";
609	}
610
611	my $redirect;
612
613	if ($recurse) {
614	my $status = $hdr{Status};
615
616	# industry standard is to redirect POST as GET for
617	# 301, 302 and 303, in contrast to http/1.0 and 1.1.
618	# also, the UA should ask the user for 301 and 307 and POST,
619	# industry standard seems to be to simply follow.
620	# we go with the industry standard.
621	if ($status == 301 or $status == 302 or $status == 303) {
622	# HTTP/1.1 is unclear on how to mutate the method
623	$method = "GET" unless $method eq "HEAD";
624	$redirect = 1;
625	} elsif ($status == 307) {
626	$redirect = 1;
627	}
628	}
629
630	my $finish = sub { # ($data, $err_status, $err_reason[, $keepalive])
631	my $keepalive = pop;
632
633	$state{handle}->destroy if $state{handle};
634	%state = ();
635
636	if (defined $_[1]) {
637	$hdr{OrigStatus} = $hdr{Status}; $hdr{Status} = $_[1];
638	$hdr{OrigReason} = $hdr{Reason}; $hdr{Reason} = $_[2];
639	}
640
641	# set-cookie processing
642	if ($arg{cookie_jar}) {
643	for ($hdr{"set-cookie"}) {
644	# parse NAME=VALUE
645	my @kv;
646
647	while (/\G\s* ([^=;,[:space:]]+) \s*=\s* (?: "((?:[^\\"]+|\\.)*)" | ([^=;,[:space:]]*) )/gcxs) {
648	my $name = $1;
649	my $value = $3;
650
651	unless ($value) {
652	$value = $2;
653	$value =~ s/\\(.)/$1/gs;
654	}
655
656	push @kv, $name => $value;
657
658	last unless /\G\s*;/gc;
659	}
660
661	last unless @kv;
662
663	my $name = shift @kv;
664	my %kv = (value => shift @kv, @kv);
665
666	my $cdom;
667	my $cpath = (delete $kv{path}) || "/";
668
669	if (exists $kv{domain}) {
670	$cdom = delete $kv{domain};
671
672	$cdom =~ s/^\.?/./; # make sure it starts with a "."
673
674	next if $cdom =~ /\.$/;
675
676	# this is not rfc-like and not netscape-like. go figure.
677	my $ndots = $cdom =~ y/.//;
678	next if $ndots < ($cdom =~ /\.[^.][^.]\.[^.][^.]$/ ? 3 : 2);
679	} else {
680	$cdom = $uhost;
681	}
682
683	# store it
684	$arg{cookie_jar}{version} = 1;
685	$arg{cookie_jar}{$cdom}{$cpath}{$name} = \%kv;
686
687	redo if /\G\s*,/gc;
688	}
689	}
690
691	if ($redirect && exists $hdr{location}) {
692	# we ignore any errors, as it is very common to receive
693	# Content-Length != 0 but no actual body
694	# we also access %hdr, as $_[1] might be an erro
695	http_request (
696	$method => $hdr{location},
697	%arg,
698	recurse => $recurse - 1,
699	Redirect => [$_[0], \%hdr],
700	$cb);
701	} else {
702	$cb->($_[0], \%hdr);
703	}
704	};
705
706	my $len = $hdr{"content-length"};
707
708	if (!$redirect && $arg{on_header} && !$arg{on_header}(\%hdr)) {
709	$finish->(undef, 598 => "Request cancelled by on_header");
710	} elsif (
711	$hdr{Status} =~ /^(?:1..|204|205|304)$/
712	or $method eq "HEAD"
713	or (defined $len && !$len)
714	) {
715	# no body
716	$finish->("", undef, undef, 1);
717	} else {
718	# body handling, many different code paths
719	# - no body expected
720	# - want_body_handle
721	# - te chunked
722	# - 2x length known (with or without on_body)
723	# - 2x length not known (with or without on_body)
724	if (!$redirect && $arg{want_body_handle}) {
725	$_[0]->on_eof (undef);
726	$_[0]->on_error (undef);
727	$_[0]->on_read (undef);
728
729	$finish->(delete $state{handle});
730
731	} elsif ($hdr{"transfer-encoding"} =~ /\bchunked\b/i) {
732	my $cl = 0;
733	my $body = undef;
734	my $on_body = $arg{on_body} || sub { $body .= shift; 1 };
735
736	$_[0]->on_error (sub { $finish->(undef, 599 => $_[2]) });
737
738	my $read_chunk; $read_chunk = sub {
739	$_[1] =~ /^([0-9a-fA-F]+)/
740	or $finish->(undef, 599 => "Garbled chunked transfer encoding");
741
742	my $len = hex $1;
743
744	if ($len) {
745	$cl += $len;
746
747	$_[0]->push_read (chunk => $len, sub {
748	$on_body->($_[1], \%hdr)
749	or return $finish->(undef, 598 => "Request cancelled by on_body");
750
751	$_[0]->push_read (line => sub {
752	length $_[1]
753	and return $finish->(undef, 599 => "Garbled chunked transfer encoding");
754	$_[0]->push_read (line => $read_chunk);
755	});
756	});
757	} else {
758	$hdr{"content-length"} ||= $cl;
759
760	$_[0]->push_read (line => $qr_nlnl, sub {
761	if (length $_[1]) {
762	for ("$_[1]") {
763	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
764
765	my $hdr = parse_hdr
766	or return $finish->(undef, 599 => "Garbled response trailers");
767
768	%hdr = (%hdr, %$hdr);
769	}
770	}
771
772	$finish->($body, undef, undef, 1);
773	});
774	}
775	};
776
777	$_[0]->push_read (line => $read_chunk);
778
779	} elsif ($arg{on_body}) {
780	$_[0]->on_error (sub { $finish->(undef, 599 => $_[2]) });
781
782	if ($len) {
783	$_[0]->on_read (sub {
784	$len -= length $_[0]{rbuf};
785
786	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
787	or return $finish->(undef, 598 => "Request cancelled by on_body");
788
789	$len > 0
790	or $finish->("", undef, undef, 1);
791	});
792	} else {
793	$_[0]->on_eof (sub {
794	$finish->("");
795	});
796	$_[0]->on_read (sub {
797	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
798	or $finish->(undef, 598 => "Request cancelled by on_body");
799	});
800	}
801	} else {
802	$_[0]->on_eof (undef);
803
804	if ($len) {
805	$_[0]->on_error (sub { $finish->(undef, 599 => $_[2]) });
806	$_[0]->on_read (sub {
807	$finish->((substr delete $_[0]{rbuf}, 0, $len, ""), undef, undef, 1)
808	if $len <= length $_[0]{rbuf};
809	});
810	} else {
811	$_[0]->on_error (sub {
812	($! == Errno::EPIPE || !$!)
813	? $finish->(delete $_[0]{rbuf})
814	: $finish->(undef, 599 => $_[2]);
815	});
816	$_[0]->on_read (sub { });
817	}
818	}
819	}
820	};
821
822	$state{handle}->push_read (line => $qr_nlnl, $state{read_response});
823	};
824
825	# now handle proxy-CONNECT method
826	if ($proxy && $uscheme eq "https") {
827	# oh dear, we have to wrap it into a connect request
828
829	# maybe re-use $uauthority with patched port?
830	$state{handle}->push_write ("CONNECT $uhost:$uport HTTP/1.0\015\012Host: $uhost\015\012\015\012");
831	$state{handle}->push_read (line => $qr_nlnl, sub {
832	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix
833	or return (%state = (), $cb->(undef, { @pseudo, Status => 599, Reason => "Invalid proxy connect response ($_[1])" }));
834
835	if ($2 == 200) {
836	$rpath = $upath;
837	&$handle_actual_request;	1243	$handle_actual_request->();
838	} else {	1244
839	%state = ();
840	$cb->(undef, { @pseudo, Status => $2, Reason => $3 });
841	}
842	});
843	} else {	1245	} else {
844	&$handle_actual_request;
845	}
846	};
847
848	my $tcp_connect = $arg{tcp_connect}	1246	my $tcp_connect = $arg{tcp_connect}
849	|| do { require AnyEvent::Socket; \&AnyEvent::Socket::tcp_connect };	1247	|| do { require AnyEvent::Socket; \&AnyEvent::Socket::tcp_connect };
850		1248
851	$state{connect_guard} = $tcp_connect->($rhost, $rport, $connect_cb, $arg{on_prepare} || sub { $timeout });	1249	$state{connect_guard} = $tcp_connect->($rhost, $rport, $connect_cb, $arg{on_prepare} || sub { $timeout });
852		1250	}
853	};	1251	};
854		1252
855	defined wantarray && AnyEvent::Util::guard { %state = () }	1253	defined wantarray && AnyEvent::Util::guard { _destroy_state %state }
856	}	1254	}
857		1255
858	sub http_get($@) {	1256	sub http_get($@) {
859	unshift @_, "GET";	1257	unshift @_, "GET";
860	&http_request	1258	&http_request
…		…
878	AnyEvent::HTTP uses the AnyEvent::Socket::tcp_connect function for	1276	AnyEvent::HTTP uses the AnyEvent::Socket::tcp_connect function for
879	the actual connection, which in turn uses AnyEvent::DNS to resolve	1277	the actual connection, which in turn uses AnyEvent::DNS to resolve
880	hostnames. The latter is a simple stub resolver and does no caching	1278	hostnames. The latter is a simple stub resolver and does no caching
881	on its own. If you want DNS caching, you currently have to provide	1279	on its own. If you want DNS caching, you currently have to provide
882	your own default resolver (by storing a suitable resolver object in	1280	your own default resolver (by storing a suitable resolver object in
883	C<$AnyEvent::DNS::RESOLVER>).	1281	C<$AnyEvent::DNS::RESOLVER>) or your own C<tcp_connect> callback.
884		1282
885	=head2 GLOBAL FUNCTIONS AND VARIABLES	1283	=head2 GLOBAL FUNCTIONS AND VARIABLES
886		1284
887	=over 4	1285	=over 4
888		1286
889	=item AnyEvent::HTTP::set_proxy "proxy-url"	1287	=item AnyEvent::HTTP::set_proxy "proxy-url"
890		1288
891	Sets the default proxy server to use. The proxy-url must begin with a	1289	Sets the default proxy server to use. The proxy-url must begin with a
892	string of the form C<http://host:port> (optionally C<https:...>), croaks	1290	string of the form C<http://host:port>, croaks otherwise.
893	otherwise.
894		1291
895	To clear an already-set proxy, use C<undef>.	1292	To clear an already-set proxy, use C<undef>.
		1293
		1294	When AnyEvent::HTTP is loaded for the first time it will query the
		1295	default proxy from the operating system, currently by looking at
		1296	C<$ENV{http_proxy>}.
		1297
		1298	=item AnyEvent::HTTP::cookie_jar_expire $jar[, $session_end]
		1299
		1300	Remove all cookies from the cookie jar that have been expired. If
		1301	C<$session_end> is given and true, then additionally remove all session
		1302	cookies.
		1303
		1304	You should call this function (with a true C<$session_end>) before you
		1305	save cookies to disk, and you should call this function after loading them
		1306	again. If you have a long-running program you can additionally call this
		1307	function from time to time.
		1308
		1309	A cookie jar is initially an empty hash-reference that is managed by this
		1310	module. Its format is subject to change, but currently it is as follows:
		1311
		1312	The key C<version> has to contain C<2>, otherwise the hash gets
		1313	cleared. All other keys are hostnames or IP addresses pointing to
		1314	hash-references. The key for these inner hash references is the
		1315	server path for which this cookie is meant, and the values are again
		1316	hash-references. Each key of those hash-references is a cookie name, and
		1317	the value, you guessed it, is another hash-reference, this time with the
		1318	key-value pairs from the cookie, except for C<expires> and C<max-age>,
		1319	which have been replaced by a C<_expires> key that contains the cookie
		1320	expiry timestamp. Session cookies are indicated by not having an
		1321	C<_expires> key.
		1322
		1323	Here is an example of a cookie jar with a single cookie, so you have a
		1324	chance of understanding the above paragraph:
		1325
		1326	{
		1327	version => 2,
		1328	"10.0.0.1" => {
		1329	"/" => {
		1330	"mythweb_id" => {
		1331	_expires => 1293917923,
		1332	value => "ooRung9dThee3ooyXooM1Ohm",
		1333	},
		1334	},
		1335	},
		1336	}
896		1337
897	=item $date = AnyEvent::HTTP::format_date $timestamp	1338	=item $date = AnyEvent::HTTP::format_date $timestamp
898		1339
899	Takes a POSIX timestamp (seconds since the epoch) and formats it as a HTTP	1340	Takes a POSIX timestamp (seconds since the epoch) and formats it as a HTTP
900	Date (RFC 2616).	1341	Date (RFC 2616).
901		1342
902	=item $timestamp = AnyEvent::HTTP::parse_date $date	1343	=item $timestamp = AnyEvent::HTTP::parse_date $date
903		1344
904	Takes a HTTP Date (RFC 2616) and returns the corresponding POSIX	1345	Takes a HTTP Date (RFC 2616) or a Cookie date (netscape cookie spec) or a
		1346	bunch of minor variations of those, and returns the corresponding POSIX
905	timestamp, or C<undef> if the date cannot be parsed.	1347	timestamp, or C<undef> if the date cannot be parsed.
906		1348
907	=item $AnyEvent::HTTP::MAX_RECURSE	1349	=item $AnyEvent::HTTP::MAX_RECURSE
908		1350
909	The default value for the C<recurse> request parameter (default: C<10>).	1351	The default value for the C<recurse> request parameter (default: C<10>).
		1352
		1353	=item $AnyEvent::HTTP::TIMEOUT
		1354
		1355	The default timeout for connection operations (default: C<300>).
910		1356
911	=item $AnyEvent::HTTP::USERAGENT	1357	=item $AnyEvent::HTTP::USERAGENT
912		1358
913	The default value for the C<User-Agent> header (the default is	1359	The default value for the C<User-Agent> header (the default is
914	C<Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>).	1360	C<Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>).
915		1361
916	=item $AnyEvent::HTTP::MAX_PER_HOST	1362	=item $AnyEvent::HTTP::MAX_PER_HOST
917		1363
918	The maximum number of concurrent connections to the same host (identified	1364	The maximum number of concurrent connections to the same host (identified
919	by the hostname). If the limit is exceeded, then the additional requests	1365	by the hostname). If the limit is exceeded, then additional requests
920	are queued until previous connections are closed.	1366	are queued until previous connections are closed. Both persistent and
		1367	non-persistent connections are counted in this limit.
921		1368
922	The default value for this is C<4>, and it is highly advisable to not	1369	The default value for this is C<4>, and it is highly advisable to not
923	increase it.	1370	increase it much.
		1371
		1372	For comparison: the RFC's recommend 4 non-persistent or 2 persistent
		1373	connections, older browsers used 2, newer ones (such as firefox 3)
		1374	typically use 6, and Opera uses 8 because like, they have the fastest
		1375	browser and give a shit for everybody else on the planet.
		1376
		1377	=item $AnyEvent::HTTP::PERSISTENT_TIMEOUT
		1378
		1379	The time after which idle persistent connections get closed by
		1380	AnyEvent::HTTP (default: C<3>).
924		1381
925	=item $AnyEvent::HTTP::ACTIVE	1382	=item $AnyEvent::HTTP::ACTIVE
926		1383
927	The number of active connections. This is not the number of currently	1384	The number of active connections. This is not the number of currently
928	running requests, but the number of currently open and non-idle TCP	1385	running requests, but the number of currently open and non-idle TCP
929	connections. This number of can be useful for load-leveling.	1386	connections. This number can be useful for load-leveling.
930		1387
931	=back	1388	=back
932		1389
933	=cut	1390	=cut
934		1391
…		…
949	sub parse_date($) {	1406	sub parse_date($) {
950	my ($date) = @_;	1407	my ($date) = @_;
951		1408
952	my ($d, $m, $y, $H, $M, $S);	1409	my ($d, $m, $y, $H, $M, $S);
953		1410
954	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$/) {	1411	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$/) {
955	# RFC 822/1123, required by RFC 2616	1412	# RFC 822/1123, required by RFC 2616 (with " ")
		1413	# cookie dates (with "-")
		1414
956	($d, $m, $y, $H, $M, $S) = ($1, $2, $3, $4, $5, $6);	1415	($d, $m, $y, $H, $M, $S) = ($1, $2, $3, $4, $5, $6);
957		1416
958	} 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$/) {	1417	} 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$/) {
959	# RFC 850	1418	# RFC 850
960	($d, $m, $y, $H, $M, $S) = ($1, $2, $3 < 69 ? $3 + 2000 : $3 + 1900, $4, $5, $6);	1419	($d, $m, $y, $H, $M, $S) = ($1, $2, $3 < 69 ? $3 + 2000 : $3 + 1900, $4, $5, $6);
961		1420
962	} 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])$/) {	1421	} 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])$/) {
963	# ISO C's asctime	1422	# ISO C's asctime
964	($d, $m, $y, $H, $M, $S) = ($2, $1, $6, $3, $4, $5);	1423	($d, $m, $y, $H, $M, $S) = ($2, $1, $6, $3, $4, $5);
965	}	1424	}
966	# other formats fail in the loop below	1425	# other formats fail in the loop below
967		1426
968	for (0..11) {	1427	for (0..11) {
969	if ($m eq $month[$_]) {	1428	if ($m eq $month[$_]) {
970	require Time::Local;	1429	require Time::Local;
971	return Time::Local::timegm ($S, $M, $H, $d, $_, $y);	1430	return eval { Time::Local::timegm ($S, $M, $H, $d, $_, $y) };
972	}	1431	}
973	}	1432	}
974		1433
975	undef	1434	undef
976	}	1435	}
977		1436
978	sub set_proxy($) {	1437	sub set_proxy($) {
979	if (length $_[0]) {	1438	if (length $_[0]) {
980	$_[0] =~ m%^(https?):// ([^:/]+) (?: : (\d*) )?%ix	1439	$_[0] =~ m%^(http):// ([^:/]+) (?: : (\d*) )?%ix
981	or Carp::croak "$_[0]: invalid proxy URL";	1440	or Carp::croak "$_[0]: invalid proxy URL";
982	$PROXY = [$2, $3 || 3128, $1]	1441	$PROXY = [$2, $3 || 3128, $1]
983	} else {	1442	} else {
984	undef $PROXY;	1443	undef $PROXY;
985	}	1444	}
…		…
988	# initialise proxy from environment	1447	# initialise proxy from environment
989	eval {	1448	eval {
990	set_proxy $ENV{http_proxy};	1449	set_proxy $ENV{http_proxy};
991	};	1450	};
992		1451
		1452	=head2 SHOWCASE
		1453
		1454	This section contains some more elaborate "real-world" examples or code
		1455	snippets.
		1456
		1457	=head2 HTTP/1.1 FILE DOWNLOAD
		1458
		1459	Downloading files with HTTP can be quite tricky, especially when something
		1460	goes wrong and you want to resume.
		1461
		1462	Here is a function that initiates and resumes a download. It uses the
		1463	last modified time to check for file content changes, and works with many
		1464	HTTP/1.0 servers as well, and usually falls back to a complete re-download
		1465	on older servers.
		1466
		1467	It calls the completion callback with either C<undef>, which means a
		1468	nonretryable error occurred, C<0> when the download was partial and should
		1469	be retried, and C<1> if it was successful.
		1470
		1471	use AnyEvent::HTTP;
		1472
		1473	sub download($$$) {
		1474	my ($url, $file, $cb) = @_;
		1475
		1476	open my $fh, "+<", $file
		1477	or die "$file: $!";
		1478
		1479	my %hdr;
		1480	my $ofs = 0;
		1481
		1482	if (stat $fh and -s _) {
		1483	$ofs = -s _;
		1484	warn "-s is ", $ofs;
		1485	$hdr{"if-unmodified-since"} = AnyEvent::HTTP::format_date +(stat _)[9];
		1486	$hdr{"range"} = "bytes=$ofs-";
		1487	}
		1488
		1489	http_get $url,
		1490	headers => \%hdr,
		1491	on_header => sub {
		1492	my ($hdr) = @_;
		1493
		1494	if ($hdr->{Status} == 200 && $ofs) {
		1495	# resume failed
		1496	truncate $fh, $ofs = 0;
		1497	}
		1498
		1499	sysseek $fh, $ofs, 0;
		1500
		1501	1
		1502	},
		1503	on_body => sub {
		1504	my ($data, $hdr) = @_;
		1505
		1506	if ($hdr->{Status} =~ /^2/) {
		1507	length $data == syswrite $fh, $data
		1508	or return; # abort on write errors
		1509	}
		1510
		1511	1
		1512	},
		1513	sub {
		1514	my (undef, $hdr) = @_;
		1515
		1516	my $status = $hdr->{Status};
		1517
		1518	if (my $time = AnyEvent::HTTP::parse_date $hdr->{"last-modified"}) {
		1519	utime $time, $time, $fh;
		1520	}
		1521
		1522	if ($status == 200 || $status == 206 || $status == 416) {
		1523	# download ok || resume ok || file already fully downloaded
		1524	$cb->(1, $hdr);
		1525
		1526	} elsif ($status == 412) {
		1527	# file has changed while resuming, delete and retry
		1528	unlink $file;
		1529	$cb->(0, $hdr);
		1530
		1531	} elsif ($status == 500 or $status == 503 or $status =~ /^59/) {
		1532	# retry later
		1533	$cb->(0, $hdr);
		1534
		1535	} else {
		1536	$cb->(undef, $hdr);
		1537	}
		1538	}
		1539	;
		1540	}
		1541
		1542	download "http://server/somelargefile", "/tmp/somelargefile", sub {
		1543	if ($_[0]) {
		1544	print "OK!\n";
		1545	} elsif (defined $_[0]) {
		1546	print "please retry later\n";
		1547	} else {
		1548	print "ERROR\n";
		1549	}
		1550	};
		1551
993	=head2 SOCKS PROXIES	1552	=head3 SOCKS PROXIES
994		1553
995	Socks proxies are not directly supported by AnyEvent::HTTP. You can	1554	Socks proxies are not directly supported by AnyEvent::HTTP. You can
996	compile your perl to support socks, or use an external program such as	1555	compile your perl to support socks, or use an external program such as
997	F<socksify> (dante) or F<tsocks> to make your program use a socks proxy	1556	F<socksify> (dante) or F<tsocks> to make your program use a socks proxy
998	transparently.	1557	transparently.

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