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HTTP::Daemon(3pm)              User Contributed Perl Documentation              HTTP::Daemon(3pm)

NAME
       HTTP::Daemon - A simple http server class

VERSION
       version 6.13

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::IP", so you can
       perform socket operations directly on it too.

       Please note that "HTTP::Daemon" used to be a subclass of "IO::Socket::INET".  To support
       IPv6, it switched the parent class to "IO::Socket::IP" at version 6.05.  See "IPv6
       SUPPORT" for details.

       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::IP" 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::IP" base class:

       $d = HTTP::Daemon->new
       $d = HTTP::Daemon->new( %opts )
           The constructor method takes the same arguments as the "IO::Socket::IP" 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::IP for a description of other arguments that can be used to configure
           the daemon during construction.

       $c = $d->accept
       $c = $d->accept( $pkg )
       ($c, $peer_addr) = $d->accept
           This method works the same as 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::IP.

           In list context both the client object and the peer address will be returned; see the
           description of the accept method of 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 subclass of "IO::Socket::IP".  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 to
           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 an "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 returns 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 of 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.

       $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.

IPv6 SUPPORT
       Since version 6.05, "HTTP::Daemon" is a subclass of "IO::Socket::IP" rather than
       "IO::Socket::INET", so that it supports IPv6.

       For some reasons, you may want to force "HTTP::Daemon" to listen on IPv4 addresses only.
       Then pass "Family" argument to "HTTP::Daemon->new":

         use HTTP::Daemon;
         use Socket 'AF_INET';

         my $d = HTTP::Daemon->new(Family => AF_INET);

SEE ALSO
       RFC 2616

       IO::Socket::IP, IO::Socket

SUPPORT
       Bugs may be submitted through <https://github.com/libwww-perl/HTTP-Daemon/issues>.

       There is also a mailing list available for users of this distribution, at
       <mailto:libwww AT perl.org>.

       There is also an irc channel available for users of this distribution, at "#lwp" on
       "irc.perl.org" <irc://irc.perl.org/#lwp>.

AUTHOR
       Gisle Aas <gisle AT activestate.com>

CONTRIBUTORS
       o   Olaf Alders <olaf AT wundersolutions.com>

       o   Ville Skyttae <ville.skytta AT iki.fi>

       o   Karen Etheridge <ether AT cpan.org>

       o   Mark Stosberg <MARKSTOS AT cpan.org>

       o   Shoichi Kaji <skaji AT cpan.org>

       o   Chase Whitener <capoeirab AT cpan.org>

       o   Slaven Rezic <slaven AT rezic.de>

       o   Petr PisaX <ppisar AT redhat.com>

       o   Zefram <zefram AT fysh.org>

       o   Alexey Tourbin <at AT altlinux.ru>

       o   Bron Gondwana <brong AT fastmail.fm>

       o   Mike Schilli <mschilli AT yahoo-inc.com>

       o   Tom Hukins <tom AT eborcom.com>

       o   Adam Kennedy <adamk AT cpan.org>

       o   Adam Sjogren <asjo AT koldfront.dk>

       o   Alex Kapranoff <ka AT nadoby.ru>

       o   amire80 <amir.aharoni AT gmail.com>

       o   Andreas J. Koenig <andreas.koenig AT anima.de>

       o   Bill Mann <wfmann AT alum.edu>

       o   Daniel Hedlund <Daniel.Hedlund AT eprize.com>

       o   David E. Wheeler <david AT justatheory.com>

       o   DAVIDRW <davidrw AT cpan.org>

       o   Father Chrysostomos <sprout AT cpan.org>

       o   Ferenc Erki <erkiferenc AT gmail.com>

       o   FWILES <FWILES AT cpan.org>

       o   Gavin Peters <gpeters AT deepsky.com>

       o   Graeme Thompson <Graeme.Thompson AT mobilecohesion.com>

       o   Hans-H. Froehlich <hfroehlich AT co-de-co.de>

       o   Ian Kilgore <iank AT cpan.org>

       o   Jacob J <waif AT chaos2.org>

       o   jefflee <shaohua AT gmail.com>

       o   john9art <john9art AT yahoo.com>

       o   murphy <murphy AT genome.edu>

       o   Ondrej Hanak <ondrej.hanak AT ubs.com>

       o   Perlover <perlover AT perlover.com>

       o   Peter Rabbitson <ribasushi AT cpan.org>

       o   phrstbrn <phrstbrn AT gmail.com>

       o   Robert Stone <talby AT trap.us>

       o   Rolf Grossmann <rg AT progtech.net>

       o   ruff <ruff AT ukrpost.net>

       o   sasao <sasao AT yugen.org>

       o   Sean M. Burke <sburke AT cpan.org>

       o   Spiros Denaxas <s.denaxas AT gmail.com>

       o   Steve Hay <SteveHay AT planit.com>

       o   Todd Lipcon <todd AT amiestreet.com>

       o   Tony Finch <dot AT dotat.at>

       o   Toru Yamaguchi <zigorou AT cpan.org>

       o   Yuri Karaban <tech AT askold.net>

COPYRIGHT AND LICENCE
       This software is copyright (c) 1995 by Gisle Aas.

       This is free software; you can redistribute it and/or modify it under the same terms as
       the Perl 5 programming language system itself.

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