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



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->url->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 responsi-
       ble 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 connec-
           tions 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 con-
           struction.

       $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::Client-
           Conn".

           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 pars-
           ing 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 gener-
           ate 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 ref-
           erence 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.



perl v5.8.8                       2008-12-05                   HTTP::Daemon(3)