/ 
AnyEvent-HTTPD-0.04
River stage two • 10 direct dependents • 11 total dependents
/ AnyEvent::HTTPD

NAME

AnyEvent::HTTPD - A simple lightweight event based web (application) server

VERSION

Version 0.04

SYNOPSIS

use AnyEvent::HTTPD;

my $httpd = AnyEvent::HTTPD->new (port => 9090);

$httpd->reg_cb (
   '/' => sub {
      my ($httpd, $req) = @_;

      $req->o ("<html><body><h1>Hello World!</h1>");
      $req->o ("<a href=\"/test\">another test page</a>");
      $req->o ("</body></html>");
      $req->respond;
   },
   '/test' => sub {
      my ($httpd, $req) = @_;

      $req->o ("<html><body><h1>Test page</h1>");
      $req->o ("<a href=\"/\">Back to the main page</a>");
      $req->o ("</body></html>");
      $req->respond;
   },
);

$httpd->run; # making a AnyEvent condition variable would also work

DESCRIPTION

This module provides a simple HTTPD for serving simple web application interfaces. It's completly event based and independend from any event loop by using the AnyEvent module.

It's HTTP implementation is a bit hacky, so before using this module make sure it works for you and the expected deployment. Feel free to improve the HTTP support and send in patches!

The documentation is currently only the source code, but next versions of this module will be better documented hopefully. See also the samples/ directory in the AnyEvent::HTTPD distribution for basic starting points.

AnyEvent::HTTPD even comes with some basic AJAX framework/helper.

FEATURES

  • support for GET and POST requests

  • processing of x-www-form-urlencoded and multipart/form-data encoded form parameters

  • ajax helper and javascript output functions in AnyEvent::HTTPD::Appgets

METHODS

The AnyEvent::HTTPD class inherits directly from AnyEvent::HTTPD::HTTPServer which inherits the event callback interface from Object::Event.

Event callbacks can be registered via the Object::Event API (see the documentation of Object::Event for details).

For a list of available events see below in the EVENTS section.

new (%args)

This is the constructor for a AnyEvent::HTTPD object. The %args hash may contain one of these key/value pairs:

port => $port

The TCP port the HTTP server will listen on.

stop_request

When the server walks the request URI path upwards you can stop the walk by calling this method. Example:

$httpd->reg_cb (
   '/test' => sub {
      my ($httpd, $req) = @_;

      # ...

      $httpd->stop_request; # will prevent that the callback below is called
   },
   '' => sub { # this one wont be called by a request to '/test'
      my ($httpd, $req) = @_;

      # ...
   }
);
run

This method is a simplification of the AnyEvent condition variable idiom. You can use it instead of writing:

my $cvar = AnyEvent->condvar;
$cvar->wait;
stop

This will stop the HTTP server and return from the run method if you started the server via that method!

EVENTS

Every request goes to a specific URL. After a (GET or POST) request is received the URL's path segments are walked down and for each segment a event is generated. An example:

If the URL '/test/bla.jpg' is requestes following events will be generated:

'/test/bla.jpg' - the event for the last segment
'/test'         - the event for the 'test' segment
''              - the root event of each request

To actually handle any request you just have to register a callback for the event name with the empty string. To handle all requests in the '/test' directory you have to register a callback for the event with the name '/test'. Here is an example how to register an event for the example URL above:

$httpd->reg_cb (
   '/test/bla.jpg' => sub {
      my ($httpd, $req) = @_;

      $req->respond ([200, 'ok', { 'Content-Type' => 'text/html' }, '<h1>Test</h1>' }]);
   }
);

See also stop_request about stopping the walk of the path segments.

The first argument to such a callback is always the AnyEvent::HTTPD object itself. The second argument ($req) is the AnyEvent::HTTPD::Request object for this request. It can be used to get the (possible) form parameters for this request or the transmitted content and respond to the request.

Also every request also emits the request event, with the same arguments and semantics, you can use this to implement your own request multiplexing.

CACHING

Any response from the HTTP server will have Cache-Control set to max-age=0 and also the Expires header set to the Date header. Meaning: Caching is disabled.

If you need caching or would like to have it you can send me a mail or even better: a patch :)

AUTHOR

Robin Redeker, <elmex at ta-sa.org>

BUGS

Please report any bugs or feature requests to bug-bs-httpd at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=AnyEvent-HTTPD. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT

You can find documentation for this module with the perldoc command.

perldoc AnyEvent::HTTPD

You can also look for information at:

ACKNOWLEDGEMENTS

COPYRIGHT & LICENSE

Copyright 2008 Robin Redeker, all rights reserved.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.