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POE::Filter::HTTPD.3pm
Langue: en
Version: 2008-07-05 (fedora - 05/07/09)
Section: 3 (Bibliothèques de fonctions)
Sommaire
NAME
POE::Filter::HTTPD - parse simple HTTP requests, and serialize HTTP::ResponseSYNOPSIS
#!perl use warnings; use strict; use POE qw(Component::Server::TCP Filter::HTTPD); use HTTP::Response; POE::Component::Server::TCP->new( Port => 8088, ClientFilter => 'POE::Filter::HTTPD', ### <-- HERE WE ARE! ClientInput => sub { my $request = $_[ARG0]; # It's a response for the client if there was a problem. if ($request->isa("HTTP::Response")) { $_[HEAP]{client}->put($request); $_[KERNEL]->yield("shutdown"); return; } my $request_fields = ''; $request->headers()->scan( sub { my ($header, $value) = @_; $request_fields .= ( "<tr><td>$header</td><td>$value</td></tr>" ); } ); my $response = HTTP::Response->new(200); $response->push_header( 'Content-type', 'text/html' ); $response->content( "<html><head><title>Your Request</title></head>" . "<body>Details about your request:" . "<table border='1'>$request_fields</table>" . "</body></html>" ); $_[HEAP]{client}->put($response); $_[KERNEL]->yield("shutdown"); } ); print "Aim your browser at port 8088 of this host.\n"; POE::Kernel->run(); exit;
DESCRIPTION
POE::Filter::HTTPD interprets input streams as HTTP 0.9 or 1.0 requests. It returns a HTTP::Request objects upon successfully parsing a request. On failure, it returns an HTTP::Response object describing the failure. The intention is that application code will notice the HTTP::Response and send it back without further processing. This is illustrated in the ``SYNOPSIS''.For output, POE::Filter::HTTPD accepts HTTP::Response objects and returns their corresponding streams.
Please see HTTP::Request and HTTP::Response for details about how to use these objects.
PUBLIC FILTER METHODS
POE::Filter::HTTPD implements the basic POE::Filter interface.CAVEATS
Some versions of libwww are known to generate invalid HTTP. For example, this code (adapted from the HTTP::Request::Common documentation) will cause an error in a POE::Filter::HTTPD daemon:use HTTP::Request::Common; use LWP::UserAgent; my $ua = LWP::UserAgent->new(); $ua->request(POST 'http://some/poe/driven/site', [ foo => 'bar' ]);
By default, HTTP::Request is HTTP version agnostic. It makes no attempt to add an HTTP version header unless you specifically declare a protocol using "$request->protocol('HTTP/1.0')".
According to the HTTP 1.0 RFC (1945), when faced with no HTTP version header, the parser is to default to HTTP/0.9. POE::Filter::HTTPD follows this convention. In the transaction detailed above, the Filter::HTTPD based daemon will return a 400 error since POST is not a valid HTTP/0.9 request type.
Streaming Media
It is possible to use POE::Filter::HTTPD for streaming content, but an application can use it to send headers and then switch to POE::Filter::Stream.From the input handler (the InputEvent handler if you're using wheels, or the ClientInput handler for POE::Component::Server::TCP):
my $response = HTTP::Response->new(200); $response->push_header('Content-type', 'audio/x-mpeg'); $_[HEAP]{client}->put($response); $_[HEAP]{client}->set_output_filter(POE::Filter::Stream->new());
Then the output-flushed handler (FlushEvent for POE::Wheel::ReadWrite, or ClientFlushed for POE::Component::Server::TCP) can put() chunks of the stream as needed.
my $bytes_read = sysread( $_[HEAP]{file_to_stream}, my $buffer = '', 4096 ); if ($bytes_read) { $_[HEAP]{client}->put($buffer); } else { delete $_[HEAP]{file_to_stream}; $_[KERNEL]->yield("shutdown"); }
SEE ALSO
Please see POE::Filter for documentation regarding the base interface.The SEE ALSO section in POE contains a table of contents covering the entire POE distribution.
HTTP::Request and HTTP::Response explain all the wonderful things you can do with these classes.
BUGS
Many aspects of HTTP 1.0 and higher are not supported, such as keep-alive. A simple I/O filter can't support keep-alive, for example. A number of more feature-rich POE HTTP servers are on the CPAN. See <http://search.cpan.org/search?query=POE+http+server&mode=dist>AUTHORS & COPYRIGHTS
POE::Filter::HTTPD was contributed by Artur Bergman. Documentation is provided by Rocco Caputo.Please see POE for more information about authors and contributors.
Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre