1HTTP::Daemon(3) User Contributed Perl Documentation HTTP::Daemon(3)
2
6 HTTP::Daemon - A simple http server class
7
9 version 6.14
10
12 use HTTP::Daemon;
13 use HTTP::Status;
14 my $d = HTTP::Daemon->new || die;
16 print "Please contact me at: <URL:", $d->url, ">\n";
17 while (my $c = $d->accept) {
18 while (my $r = $c->get_request) {
19 if ($r->method eq 'GET' and $r->uri->path eq "/xyzzy") {
20 # remember, this is *not* recommended practice :-)
21 $c->send_file_response("/etc/passwd");
22 }
23 else {
24 $c->send_error(RC_FORBIDDEN)
25 }
26 }
27 $c->close;
28 undef($c);
29 }
30
32 Instances of the "HTTP::Daemon" class are HTTP/1.1 servers that listen
33 on a socket for incoming requests. The "HTTP::Daemon" is a subclass of
34 "IO::Socket::IP", so you can perform socket operations directly on it
35 too.
36 Please note that "HTTP::Daemon" used to be a subclass of
38 "IO::Socket::INET". To support IPv6, it switched the parent class to
39 "IO::Socket::IP" at version 6.05. See "IPv6 SUPPORT" for details.
40 The accept() method will return when a connection from a client is
42 available. The returned value will be an "HTTP::Daemon::ClientConn"
43 object which is another "IO::Socket::IP" subclass. Calling the
44 get_request() method on this object will read data from the client and
45 return an "HTTP::Request" object. The ClientConn object also provide
46 methods to send back various responses.
47 This HTTP daemon does not fork(2) for you. Your application, i.e. the
49 user of the "HTTP::Daemon" is responsible for forking if that is
50 desirable. Also note that the user is responsible for generating
51 responses that conform to the HTTP/1.1 protocol.
52 The following methods of "HTTP::Daemon" are new (or enhanced) relative
54 to the "IO::Socket::IP" base class:
55 $d = HTTP::Daemon->new
57 $d = HTTP::Daemon->new( %opts )
58 The constructor method takes the same arguments as the
59 "IO::Socket::IP" constructor, but unlike its base class it can also
60 be called without any arguments. The daemon will then set up a
61 listen queue of 5 connections and allocate some random port number.
62 A server that wants to bind to some specific address on the
64 standard HTTP port will be constructed like this:
65 $d = HTTP::Daemon->new(
67 LocalAddr => 'www.thisplace.com',
68 LocalPort => 80,
69 );
70 See IO::Socket::IP for a description of other arguments that can be
72 used to configure the daemon during construction.
73 $c = $d->accept
75 $c = $d->accept( $pkg )
76 ($c, $peer_addr) = $d->accept
77 This method works the same as the one provided by the base class,
78 but it returns an "HTTP::Daemon::ClientConn" reference by default.
79 If a package name is provided as argument, then the returned object
80 will be blessed into the given class. It is probably a good idea
81 to make that class a subclass of "HTTP::Daemon::ClientConn".
82 The accept method will return "undef" if timeouts have been enabled
84 and no connection is made within the given time. The timeout()
85 method is described in IO::Socket::IP.
86 In list context both the client object and the peer address will be
88 returned; see the description of the accept method of IO::Socket
89 for details.
90 $d->url
92 Returns a URL string that can be used to access the server root.
93 $d->product_tokens
95 Returns the name that this server will use to identify itself.
96 This is the string that is sent with the "Server" response header.
97 The main reason to have this method is that subclasses can override
98 it if they want to use another product name.
99 The default is the string "libwww-perl-daemon/#.##" where "#.##" is
101 replaced with the version number of this module.
102 The "HTTP::Daemon::ClientConn" is a subclass of "IO::Socket::IP".
104 Instances of this class are returned by the accept() method of
105 "HTTP::Daemon". The following methods are provided:
106 $c->get_request
108 $c->get_request( $headers_only )
109 This method reads data from the client and turns it into an
110 "HTTP::Request" object which is returned. It returns "undef" if
111 reading fails. If it fails, then the "HTTP::Daemon::ClientConn"
112 object ($c) should be discarded, and you should not try to call
113 this method again on it. The $c->reason method might give you some
114 information about why $c->get_request failed.
115 The get_request() method will normally not return until the whole
117 request has been received from the client. This might not be what
118 you want if the request is an upload of a large file (and with
119 chunked transfer encoding HTTP can even support infinite request
120 messages - uploading live audio for instance). If you pass a TRUE
121 value as the $headers_only argument, then get_request() will return
122 immediately after parsing the request headers and you are
123 responsible for reading the rest of the request content. If you
124 are going to call $c->get_request again on the same connection you
125 better read the correct number of bytes.
126 $c->read_buffer
128 $c->read_buffer( $new_value )
129 Bytes read by $c->get_request, but not used are placed in the read
130 buffer. The next time $c->get_request is called it will consume
131 the bytes in this buffer before reading more data from the network
132 connection itself. The read buffer is invalid after
133 $c->get_request has failed.
134 If you handle the reading of the request content yourself you need
136 to empty this buffer before you read more and you need to place
137 unconsumed bytes here. You also need this buffer if you implement
138 services like 101 Switching Protocols.
139 This method always returns the old buffer content and can
141 optionally replace the buffer content if you pass it an argument.
142 $c->reason
144 When $c->get_request returns "undef" you can obtain a short string
145 describing why it happened by calling $c->reason.
146 $c->proto_ge( $proto )
148 Return TRUE if the client announced a protocol with version number
149 greater or equal to the given argument. The $proto argument can be
150 a string like "HTTP/1.1" or just "1.1".
151 $c->antique_client
153 Return TRUE if the client speaks the HTTP/0.9 protocol. No status
154 code and no headers should be returned to such a client. This
155 should be the same as !$c->proto_ge("HTTP/1.0").
156 $c->head_request
158 Return TRUE if the last request was a "HEAD" request. No content
159 body must be generated for these requests.
160 $c->force_last_request
162 Make sure that $c->get_request will not try to read more requests
163 off this connection. If you generate a response that is not self-
164 delimiting, then you should signal this fact by calling this
165 method.
166 This attribute is turned on automatically if the client announces
168 protocol HTTP/1.0 or worse and does not include a "Connection:
169 Keep-Alive" header. It is also turned on automatically when
170 HTTP/1.1 or better clients send the "Connection: close" request
171 header.
172 $c->send_status_line
174 $c->send_status_line( $code )
175 $c->send_status_line( $code, $mess )
176 $c->send_status_line( $code, $mess, $proto )
177 Send the status line back to the client. If $code is omitted 200
178 is assumed. If $mess is omitted, then a message corresponding to
179 $code is inserted. If $proto is missing the content of the
180 $HTTP::Daemon::PROTO variable is used.
181 $c->send_crlf
183 Send the CRLF sequence to the client.
184 $c->send_basic_header
186 $c->send_basic_header( $code )
187 $c->send_basic_header( $code, $mess )
188 $c->send_basic_header( $code, $mess, $proto )
189 Send the status line and the "Date:" and "Server:" headers back to
190 the client. This header is assumed to be continued and does not
191 end with an empty CRLF line.
192 See the description of send_status_line() for the description of
194 the accepted arguments.
195 $c->send_header( $field, $value )
197 $c->send_header( $field1, $value1, $field2, $value2, ... )
198 Send one or more header lines.
199 $c->send_response( $res )
201 Write an "HTTP::Response" object to the client as a response. We
202 try hard to make sure that the response is self-delimiting so that
203 the connection can stay persistent for further request/response
204 exchanges.
205 The content attribute of the "HTTP::Response" object can be a
207 normal string or a subroutine reference. If it is a subroutine,
208 then whatever this callback routine returns is written back to the
209 client as the response content. The routine will be called until
210 it returns an undefined or empty value. If the client is HTTP/1.1
211 aware then we will use chunked transfer encoding for the response.
212 $c->send_redirect( $loc )
214 $c->send_redirect( $loc, $code )
215 $c->send_redirect( $loc, $code, $entity_body )
216 Send a redirect response back to the client. The location ($loc)
217 can be an absolute or relative URL. The $code must be one of the
218 redirect status codes, and defaults to "301 Moved Permanently"
219 $c->send_error
221 $c->send_error( $code )
222 $c->send_error( $code, $error_message )
223 Send an error response back to the client. If the $code is missing
224 a "Bad Request" error is reported. The $error_message is a string
225 that is incorporated in the body of the HTML entity.
226 $c->send_file_response( $filename )
228 Send back a response with the specified $filename as content. If
229 the file is a directory we try to generate an HTML index of it.
230 $c->send_file( $filename )
232 $c->send_file( $fd )
233 Copy the file to the client. The file can be a string (which will
234 be interpreted as a filename) or a reference to an "IO::Handle" or
235 glob.
236 $c->daemon
238 Return a reference to the corresponding "HTTP::Daemon" object.
239
241 Since version 6.05, "HTTP::Daemon" is a subclass of "IO::Socket::IP"
242 rather than "IO::Socket::INET", so that it supports IPv6.
243 For some reasons, you may want to force "HTTP::Daemon" to listen on
245 IPv4 addresses only. Then pass "Family" argument to
246 "HTTP::Daemon->new":
247 use HTTP::Daemon;
249 use Socket 'AF_INET';
250 my $d = HTTP::Daemon->new(Family => AF_INET);
252
254 RFC 2616
255 IO::Socket::IP, IO::Socket
257
259 Bugs may be submitted through
260 <https://github.com/libwww-perl/HTTP-Daemon/issues>.
261 There is also a mailing list available for users of this distribution,
263 at <mailto:libwww@perl.org>.
264 There is also an irc channel available for users of this distribution,
266 at "#lwp" on "irc.perl.org" <irc://irc.perl.org/#lwp>.
267
269 Gisle Aas <gisle@activestate.com>
270
272 • Olaf Alders <olaf@wundersolutions.com>
273 • Ville Skyttä <ville.skytta@iki.fi>
275 • Karen Etheridge <ether@cpan.org>
277 • Mark Stosberg <MARKSTOS@cpan.org>
279 • Shoichi Kaji <skaji@cpan.org>
281 • Chase Whitener <capoeirab@cpan.org>
283 • Slaven Rezic <slaven@rezic.de>
285 • Petr Písař <ppisar@redhat.com>
287 • Zefram <zefram@fysh.org>
289 • Alexey Tourbin <at@altlinux.ru>
291 • Bron Gondwana <brong@fastmail.fm>
293 • Michal Josef Špaček <mspacek@redhat.com>
295 • Mike Schilli <mschilli@yahoo-inc.com>
297 • Tom Hukins <tom@eborcom.com>
299 • Adam Kennedy <adamk@cpan.org>
301 • Adam Sjogren <asjo@koldfront.dk>
303 • Alex Kapranoff <ka@nadoby.ru>
305 • amire80 <amir.aharoni@gmail.com>
307 • Andreas J. Koenig <andreas.koenig@anima.de>
309 • Bill Mann <wfmann@alum.mit.edu>
311 • Daniel Hedlund <Daniel.Hedlund@eprize.com>
313 • David E. Wheeler <david@justatheory.com>
315 • DAVIDRW <davidrw@cpan.org>
317 • Father Chrysostomos <sprout@cpan.org>
319 • Ferenc Erki <erkiferenc@gmail.com>
321 • FWILES <FWILES@cpan.org>
323 • Gavin Peters <gpeters@deepsky.com>
325 • Graeme Thompson <Graeme.Thompson@mobilecohesion.com>
327 • Hans-H. Froehlich <hfroehlich@co-de-co.de>
329 • Ian Kilgore <iank@cpan.org>
331 • Jacob J <waif@chaos2.org>
333 • jefflee <shaohua@gmail.com>
335 • john9art <john9art@yahoo.com>
337 • murphy <murphy@genome.chop.edu>
339 • Ondrej Hanak <ondrej.hanak@ubs.com>
341 • Perlover <perlover@perlover.com>
343 • Peter Rabbitson <ribasushi@cpan.org>
345 • phrstbrn <phrstbrn@gmail.com>
347 • Robert Stone <talby@trap.mtview.ca.us>
349 • Rolf Grossmann <rg@progtech.net>
351 • ruff <ruff@ukrpost.net>
353 • sasao <sasao@yugen.org>
355 • Sean M. Burke <sburke@cpan.org>
357 • Spiros Denaxas <s.denaxas@gmail.com>
359 • Steve Hay <SteveHay@planit.com>
361 • Todd Lipcon <todd@amiestreet.com>
363 • Tony Finch <dot@dotat.at>
365 • Toru Yamaguchi <zigorou@cpan.org>
367 • Yuri Karaban <tech@askold.net>
369
371 This software is copyright (c) 1995 by Gisle Aas.
372 This is free software; you can redistribute it and/or modify it under
374 the same terms as the Perl 5 programming language system itself.
375perl v5.36.0 2022-07-22 HTTP::Daemon(3)