Provided by: libhttp-daemon-perl_6.01-1ubuntu0.1_all 
NAME
HTTP::Daemon - a simple http server class
SYNOPSIS
use HTTP::Daemon;
use HTTP::Status;
my $d = HTTP::Daemon->new || die;
print "Please contact me at: <URL:", $d->url, ">\n";
while (my $c = $d->accept) {
while (my $r = $c->get_request) {
if ($r->method eq 'GET' and $r->uri->path eq "/xyzzy") {
# remember, this is *not* recommended practice :-)
$c->send_file_response("/etc/passwd");
}
else {
$c->send_error(RC_FORBIDDEN)
}
}
$c->close;
undef($c);
}
DESCRIPTION
Instances of the "HTTP::Daemon" class are HTTP/1.1 servers that listen on a socket for
incoming requests. The "HTTP::Daemon" is a subclass of "IO::Socket::INET", so you can
perform socket operations directly on it too.
The accept() method will return when a connection from a client is available. The
returned value will be an "HTTP::Daemon::ClientConn" object which is another
"IO::Socket::INET" subclass. Calling the get_request() method on this object will read
data from the client and return an "HTTP::Request" object. The ClientConn object also
provide methods to send back various responses.
This HTTP daemon does not fork(2) for you. Your application, i.e. the user of the
"HTTP::Daemon" is responsible for forking if that is desirable. Also note that the user
is responsible for generating responses that conform to the HTTP/1.1 protocol.
The following methods of "HTTP::Daemon" are new (or enhanced) relative to the
"IO::Socket::INET" base class:
$d = HTTP::Daemon->new
$d = HTTP::Daemon->new( %opts )
The constructor method takes the same arguments as the "IO::Socket::INET" constructor,
but unlike its base class it can also be called without any arguments. The daemon
will then set up a listen queue of 5 connections and allocate some random port number.
A server that wants to bind to some specific address on the standard HTTP port will be
constructed like this:
$d = HTTP::Daemon->new(
LocalAddr => 'www.thisplace.com',
LocalPort => 80,
);
See IO::Socket::INET for a description of other arguments that can be used configure
the daemon during construction.
$c = $d->accept
$c = $d->accept( $pkg )
($c, $peer_addr) = $d->accept
This method works the same the one provided by the base class, but it returns an
"HTTP::Daemon::ClientConn" reference by default. If a package name is provided as
argument, then the returned object will be blessed into the given class. It is
probably a good idea to make that class a subclass of "HTTP::Daemon::ClientConn".
The accept method will return "undef" if timeouts have been enabled and no connection
is made within the given time. The timeout() method is described in IO::Socket.
In list context both the client object and the peer address will be returned; see the
description of the accept method IO::Socket for details.
$d->url
Returns a URL string that can be used to access the server root.
$d->product_tokens
Returns the name that this server will use to identify itself. This is the string
that is sent with the "Server" response header. The main reason to have this method
is that subclasses can override it if they want to use another product name.
The default is the string "libwww-perl-daemon/#.##" where "#.##" is replaced with the
version number of this module.
The "HTTP::Daemon::ClientConn" is a "IO::Socket::INET" subclass. Instances of this class
are returned by the accept() method of "HTTP::Daemon". The following methods are
provided:
$c->get_request
$c->get_request( $headers_only )
This method reads data from the client and turns it into an "HTTP::Request" object
which is returned. It returns "undef" if reading fails. If it fails, then the
"HTTP::Daemon::ClientConn" object ($c) should be discarded, and you should not try
call this method again on it. The $c->reason method might give you some information
about why $c->get_request failed.
The get_request() method will normally not return until the whole request has been
received from the client. This might not be what you want if the request is an upload
of a large file (and with chunked transfer encoding HTTP can even support infinite
request messages - uploading live audio for instance). If you pass a TRUE value as
the $headers_only argument, then get_request() will return immediately after parsing
the request headers and you are responsible for reading the rest of the request
content. If you are going to call $c->get_request again on the same connection you
better read the correct number of bytes.
$c->read_buffer
$c->read_buffer( $new_value )
Bytes read by $c->get_request, but not used are placed in the read buffer. The next
time $c->get_request is called it will consume the bytes in this buffer before reading
more data from the network connection itself. The read buffer is invalid after
$c->get_request has failed.
If you handle the reading of the request content yourself you need to empty this
buffer before you read more and you need to place unconsumed bytes here. You also
need this buffer if you implement services like 101 Switching Protocols.
This method always returns the old buffer content and can optionally replace the
buffer content if you pass it an argument.
$c->reason
When $c->get_request returns "undef" you can obtain a short string describing why it
happened by calling $c->reason.
$c->proto_ge( $proto )
Return TRUE if the client announced a protocol with version number greater or equal to
the given argument. The $proto argument can be a string like "HTTP/1.1" or just
"1.1".
$c->antique_client
Return TRUE if the client speaks the HTTP/0.9 protocol. No status code and no headers
should be returned to such a client. This should be the same as
!$c->proto_ge("HTTP/1.0").
$c->head_request
Return TRUE if the last request was a "HEAD" request. No content body must be
generated for these requests.
$c->force_last_request
Make sure that $c->get_request will not try to read more requests off this connection.
If you generate a response that is not self delimiting, then you should signal this
fact by calling this method.
This attribute is turned on automatically if the client announces protocol HTTP/1.0 or
worse and does not include a "Connection: Keep-Alive" header. It is also turned on
automatically when HTTP/1.1 or better clients send the "Connection: close" request
header.
$c->send_status_line
$c->send_status_line( $code )
$c->send_status_line( $code, $mess )
$c->send_status_line( $code, $mess, $proto )
Send the status line back to the client. If $code is omitted 200 is assumed. If
$mess is omitted, then a message corresponding to $code is inserted. If $proto is
missing the content of the $HTTP::Daemon::PROTO variable is used.
$c->send_crlf
Send the CRLF sequence to the client.
$c->send_basic_header
$c->send_basic_header( $code )
$c->send_basic_header( $code, $mess )
$c->send_basic_header( $code, $mess, $proto )
Send the status line and the "Date:" and "Server:" headers back to the client. This
header is assumed to be continued and does not end with an empty CRLF line.
See the description of send_status_line() for the description of the accepted
arguments.
$c->send_header( $field, $value )
$c->send_header( $field1, $value1, $field2, $value2, ... )
Send one or more header lines.
$c->send_response( $res )
Write a "HTTP::Response" object to the client as a response. We try hard to make sure
that the response is self delimiting so that the connection can stay persistent for
further request/response exchanges.
The content attribute of the "HTTP::Response" object can be a normal string or a
subroutine reference. If it is a subroutine, then whatever this callback routine
returns is written back to the client as the response content. The routine will be
called until it return an undefined or empty value. If the client is HTTP/1.1 aware
then we will use chunked transfer encoding for the response.
$c->send_redirect( $loc )
$c->send_redirect( $loc, $code )
$c->send_redirect( $loc, $code, $entity_body )
Send a redirect response back to the client. The location ($loc) can be an absolute
or relative URL. The $code must be one the redirect status codes, and defaults to "301
Moved Permanently"
$c->send_error
$c->send_error( $code )
$c->send_error( $code, $error_message )
Send an error response back to the client. If the $code is missing a "Bad Request"
error is reported. The $error_message is a string that is incorporated in the body of
the HTML entity body.
$c->send_file_response( $filename )
Send back a response with the specified $filename as content. If the file is a
directory we try to generate an HTML index of it.
$c->send_file( $filename )
$c->send_file( $fd )
Copy the file to the client. The file can be a string (which will be interpreted as a
filename) or a reference to an "IO::Handle" or glob.
$c->daemon
Return a reference to the corresponding "HTTP::Daemon" object.
SEE ALSO
RFC 2616
IO::Socket::INET, IO::Socket
COPYRIGHT
Copyright 1996-2003, Gisle Aas
This library is free software; you can redistribute it and/or modify it under the same
terms as Perl itself.