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Revision 1.24 by root, Wed Nov 14 22:22:24 2012 UTC vs.
Revision 1.27 by root, Sun Aug 28 09:31:29 2016 UTC

50 object at least alive until the callback get called. If the object 50 object at least alive until the callback get called. If the object
51 gets destroyed before the callback is called, the request will be 51 gets destroyed before the callback is called, the request will be
52 cancelled. 52 cancelled.
53 53
54 The callback will be called with the response body data as first 54 The callback will be called with the response body data as first
55 argument (or "undef" if an error occured), and a hash-ref with 55 argument (or "undef" if an error occurred), and a hash-ref with
56 response headers (and trailers) as second argument. 56 response headers (and trailers) as second argument.
57 57
58 All the headers in that hash are lowercased. In addition to the 58 All the headers in that hash are lowercased. In addition to the
59 response headers, the "pseudo-headers" (uppercase to avoid clashing 59 response headers, the "pseudo-headers" (uppercase to avoid clashing
60 with possible response headers) "HTTPVersion", "Status" and "Reason" 60 with possible response headers) "HTTPVersion", "Status" and "Reason"
82 If an internal error occurs, such as not being able to resolve a 82 If an internal error occurs, such as not being able to resolve a
83 hostname, then $data will be "undef", "$headers->{Status}" will be 83 hostname, then $data will be "undef", "$headers->{Status}" will be
84 590-599 and the "Reason" pseudo-header will contain an error 84 590-599 and the "Reason" pseudo-header will contain an error
85 message. Currently the following status codes are used: 85 message. Currently the following status codes are used:
86 86
87 595 - errors during connection etsbalishment, proxy handshake. 87 595 - errors during connection establishment, proxy handshake.
88 596 - errors during TLS negotiation, request sending and header 88 596 - errors during TLS negotiation, request sending and header
89 processing. 89 processing.
90 597 - errors during body receiving or processing. 90 597 - errors during body receiving or processing.
91 598 - user aborted request via "on_header" or "on_body". 91 598 - user aborted request via "on_header" or "on_body".
92 599 - other, usually nonretryable, errors (garbled URL etc.). 92 599 - other, usually nonretryable, errors (garbled URL etc.).
108 108
109 recurse => $count (default: $MAX_RECURSE) 109 recurse => $count (default: $MAX_RECURSE)
110 Whether to recurse requests or not, e.g. on redirects, 110 Whether to recurse requests or not, e.g. on redirects,
111 authentication and other retries and so on, and how often to do 111 authentication and other retries and so on, and how often to do
112 so. 112 so.
113
114 Only redirects to http and https URLs are supported. While most
115 common redirection forms are handled entirely within this
116 module, some require the use of the optional URI module. If it
117 is required but missing, then the request will fail with an
118 error.
113 119
114 headers => hashref 120 headers => hashref
115 The request headers to use. Currently, "http_request" may 121 The request headers to use. Currently, "http_request" may
116 provide its own "Host:", "Content-Length:", "Connection:" and 122 provide its own "Host:", "Content-Length:", "Connection:" and
117 "Cookie:" headers and will provide defaults at least for "TE:", 123 "Cookie:" headers and will provide defaults at least for "TE:",
141 $scheme must be either missing or must be "http" for HTTP. 147 $scheme must be either missing or must be "http" for HTTP.
142 148
143 If not specified, then the default proxy is used (see 149 If not specified, then the default proxy is used (see
144 "AnyEvent::HTTP::set_proxy"). 150 "AnyEvent::HTTP::set_proxy").
145 151
152 Currently, if your proxy requires authorization, you have to
153 specify an appropriate "Proxy-Authorization" header in every
154 request.
155
146 body => $string 156 body => $string
147 The request body, usually empty. Will be sent as-is (future 157 The request body, usually empty. Will be sent as-is (future
148 versions of this module might offer more options). 158 versions of this module might offer more options).
149 159
150 cookie_jar => $hash_ref 160 cookie_jar => $hash_ref
189 object storing your state data, or the TLS context) - only 199 object storing your state data, or the TLS context) - only
190 connections using the same unique ID will be reused. 200 connections using the same unique ID will be reused.
191 201
192 on_prepare => $callback->($fh) 202 on_prepare => $callback->($fh)
193 In rare cases you need to "tune" the socket before it is used to 203 In rare cases you need to "tune" the socket before it is used to
194 connect (for exmaple, to bind it on a given IP address). This 204 connect (for example, to bind it on a given IP address). This
195 parameter overrides the prepare callback passed to 205 parameter overrides the prepare callback passed to
196 "AnyEvent::Socket::tcp_connect" and behaves exactly the same way 206 "AnyEvent::Socket::tcp_connect" and behaves exactly the same way
197 (e.g. it has to provide a timeout). See the description for the 207 (e.g. it has to provide a timeout). See the description for the
198 $prepare_cb argument of "AnyEvent::Socket::tcp_connect" for 208 $prepare_cb argument of "AnyEvent::Socket::tcp_connect" for
199 details. 209 details.
372 Sets the default proxy server to use. The proxy-url must begin with 382 Sets the default proxy server to use. The proxy-url must begin with
373 a string of the form "http://host:port", croaks otherwise. 383 a string of the form "http://host:port", croaks otherwise.
374 384
375 To clear an already-set proxy, use "undef". 385 To clear an already-set proxy, use "undef".
376 386
377 When AnyEvent::HTTP is laoded for the first time it will query the 387 When AnyEvent::HTTP is loaded for the first time it will query the
378 default proxy from the operating system, currently by looking at 388 default proxy from the operating system, currently by looking at
379 "$ENV{http_proxy"}. 389 "$ENV{http_proxy"}.
380 390
381 AnyEvent::HTTP::cookie_jar_expire $jar[, $session_end] 391 AnyEvent::HTTP::cookie_jar_expire $jar[, $session_end]
382 Remove all cookies from the cookie jar that have been expired. If 392 Remove all cookies from the cookie jar that have been expired. If
384 cookies. 394 cookies.
385 395
386 You should call this function (with a true $session_end) before you 396 You should call this function (with a true $session_end) before you
387 save cookies to disk, and you should call this function after 397 save cookies to disk, and you should call this function after
388 loading them again. If you have a long-running program you can 398 loading them again. If you have a long-running program you can
389 additonally call this function from time to time. 399 additionally call this function from time to time.
390 400
391 A cookie jar is initially an empty hash-reference that is managed by 401 A cookie jar is initially an empty hash-reference that is managed by
392 this module. It's format is subject to change, but currently it is 402 this module. Its format is subject to change, but currently it is as
393 like this: 403 follows:
394 404
395 The key "version" has to contain 1, otherwise the hash gets emptied. 405 The key "version" has to contain 1, otherwise the hash gets emptied.
396 All other keys are hostnames or IP addresses pointing to 406 All other keys are hostnames or IP addresses pointing to
397 hash-references. The key for these inner hash references is the 407 hash-references. The key for these inner hash references is the
398 server path for which this cookie is meant, and the values are again 408 server path for which this cookie is meant, and the values are again
399 hash-references. The keys of those hash-references is the cookie 409 hash-references. Each key of those hash-references is a cookie name,
400 name, and the value, you guessed it, is another hash-reference, this 410 and the value, you guessed it, is another hash-reference, this time
401 time with the key-value pairs from the cookie, except for "expires" 411 with the key-value pairs from the cookie, except for "expires" and
402 and "max-age", which have been replaced by a "_expires" key that 412 "max-age", which have been replaced by a "_expires" key that
403 contains the cookie expiry timestamp. 413 contains the cookie expiry timestamp. Session cookies are indicated
414 by not having an "_expires" key.
404 415
405 Here is an example of a cookie jar with a single cookie, so you have 416 Here is an example of a cookie jar with a single cookie, so you have
406 a chance of understanding the above paragraph: 417 a chance of understanding the above paragraph:
407 418
408 { 419 {
438 "Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; 449 "Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION;
439 +http://software.schmorp.de/pkg/AnyEvent)"). 450 +http://software.schmorp.de/pkg/AnyEvent)").
440 451
441 $AnyEvent::HTTP::MAX_PER_HOST 452 $AnyEvent::HTTP::MAX_PER_HOST
442 The maximum number of concurrent connections to the same host 453 The maximum number of concurrent connections to the same host
443 (identified by the hostname). If the limit is exceeded, then the 454 (identified by the hostname). If the limit is exceeded, then
444 additional requests are queued until previous connections are 455 additional requests are queued until previous connections are
445 closed. Both persistent and non-persistent connections are counted 456 closed. Both persistent and non-persistent connections are counted
446 in this limit. 457 in this limit.
447 458
448 The default value for this is 4, and it is highly advisable to not 459 The default value for this is 4, and it is highly advisable to not
449 increase it much. 460 increase it much.
450 461
451 For comparison: the RFC's recommend 4 non-persistent or 2 persistent 462 For comparison: the RFC's recommend 4 non-persistent or 2 persistent
452 connections, older browsers used 2, newers (such as firefox 3) 463 connections, older browsers used 2, newer ones (such as firefox 3)
453 typically use 6, and Opera uses 8 because like, they have the 464 typically use 6, and Opera uses 8 because like, they have the
454 fastest browser and give a shit for everybody else on the planet. 465 fastest browser and give a shit for everybody else on the planet.
455 466
456 $AnyEvent::HTTP::PERSISTENT_TIMEOUT 467 $AnyEvent::HTTP::PERSISTENT_TIMEOUT
457 The time after which idle persistent conenctions get closed by 468 The time after which idle persistent connections get closed by
458 AnyEvent::HTTP (default: 3). 469 AnyEvent::HTTP (default: 3).
459 470
460 $AnyEvent::HTTP::ACTIVE 471 $AnyEvent::HTTP::ACTIVE
461 The number of active connections. This is not the number of 472 The number of active connections. This is not the number of
462 currently running requests, but the number of currently open and 473 currently running requests, but the number of currently open and
463 non-idle TCP connections. This number can be useful for 474 non-idle TCP connections. This number can be useful for
464 load-leveling. 475 load-leveling.
465 476
466 SHOWCASE 477 SHOWCASE
467 This section contaisn some more elaborate "real-world" examples or code 478 This section contains some more elaborate "real-world" examples or code
468 snippets. 479 snippets.
469 480
470 HTTP/1.1 FILE DOWNLOAD 481 HTTP/1.1 FILE DOWNLOAD
471 Downloading files with HTTP can be quite tricky, especially when 482 Downloading files with HTTP can be quite tricky, especially when
472 something goes wrong and you want to resume. 483 something goes wrong and you want to resume.
475 last modified time to check for file content changes, and works with 486 last modified time to check for file content changes, and works with
476 many HTTP/1.0 servers as well, and usually falls back to a complete 487 many HTTP/1.0 servers as well, and usually falls back to a complete
477 re-download on older servers. 488 re-download on older servers.
478 489
479 It calls the completion callback with either "undef", which means a 490 It calls the completion callback with either "undef", which means a
480 nonretryable error occured, 0 when the download was partial and should 491 nonretryable error occurred, 0 when the download was partial and should
481 be retried, and 1 if it was successful. 492 be retried, and 1 if it was successful.
482 493
483 use AnyEvent::HTTP; 494 use AnyEvent::HTTP;
484 495
485 sub download($$$) { 496 sub download($$$) {
489 or die "$file: $!"; 500 or die "$file: $!";
490 501
491 my %hdr; 502 my %hdr;
492 my $ofs = 0; 503 my $ofs = 0;
493 504
494 warn stat $fh;
495 warn -s _;
496 if (stat $fh and -s _) { 505 if (stat $fh and -s _) {
497 $ofs = -s _; 506 $ofs = -s _;
498 warn "-s is ", $ofs; 507 warn "-s is ", $ofs;
499 $hdr{"if-unmodified-since"} = AnyEvent::HTTP::format_date +(stat _)[9]; 508 $hdr{"if-unmodified-since"} = AnyEvent::HTTP::format_date +(stat _)[9];
500 $hdr{"range"} = "bytes=$ofs-"; 509 $hdr{"range"} = "bytes=$ofs-";
528 my (undef, $hdr) = @_; 537 my (undef, $hdr) = @_;
529 538
530 my $status = $hdr->{Status}; 539 my $status = $hdr->{Status};
531 540
532 if (my $time = AnyEvent::HTTP::parse_date $hdr->{"last-modified"}) { 541 if (my $time = AnyEvent::HTTP::parse_date $hdr->{"last-modified"}) {
533 utime $fh, $time, $time; 542 utime $time, $time, $fh;
534 } 543 }
535 544
536 if ($status == 200 || $status == 206 || $status == 416) { 545 if ($status == 200 || $status == 206 || $status == 416) {
537 # download ok || resume ok || file already fully downloaded 546 # download ok || resume ok || file already fully downloaded
538 $cb->(1, $hdr); 547 $cb->(1, $hdr);
623 632
624AUTHOR 633AUTHOR
625 Marc Lehmann <schmorp@schmorp.de> 634 Marc Lehmann <schmorp@schmorp.de>
626 http://home.schmorp.de/ 635 http://home.schmorp.de/
627 636
628 With many thanks to Дмитрий Шалашов, who provided 637 With many thanks to Дмитрий Шалашов, who provided countless testcases
629 countless testcases and bugreports. 638 and bugreports.
630 639

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