|
|
HTTP::Daemon - a simple http server class
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);
}
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:
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:
$d = HTTP::Daemon->new(
LocalAddr => 'www.thisplace.com',
LocalPort => 80,
);
See the IO::Socket::INET manpage for a description of other arguments that can be used configure the daemon during construction.
This method works the same the one provided by the base class, but it
returns an HTTP::Daemon::ClientConn reference by default. If a
package name is provided as argument, then the returned object will be
blessed into the given class. It is probably a good idea to make that
class a subclass of HTTP::Daemon::ClientConn.
The accept method will return undef if timeouts have been enabled
and no connection is made within the given time. The timeout() method
is described in the IO::Socket manpage.
In list context both the client object and the peer address will be returned; see the description of the accept method the IO::Socket manpage for details.
Returns a URL string that can be used to access the server root.
Returns the name that this server will use to identify itself. This
is the string that is sent with the Server response header. The
main reason to have this method is that subclasses can override it if
they want to use another product name.
The default is the string ``libwww-perl-daemon/#.##'' where ``#.##'' is replaced with the version number of this module.
The HTTP::Daemon::ClientConn is a IO::Socket::INET
subclass. Instances of this class are returned by the accept() method
of HTTP::Daemon. The following methods are provided:
This method read data from the client and turns it into an
HTTP::Request object which is returned. It returns undef
if reading fails. If it fails, then the HTTP::Daemon::ClientConn
object ($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.
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 return the old buffer content and can optionally replace the buffer content if you pass it an argument.
When $c->get_request returns undef you can obtain a short string
describing why it happened by calling $c->reason.
Return TRUE if the client announced a protocol with version number greater or equal to the given argument. The $proto argument can be a string like ``HTTP/1.1'' or just ``1.1''.
Return TRUE if the client speaks the HTTP/0.9 protocol. No status code and no headers should be returned to such a client. This should be the same as !$c->proto_ge(``HTTP/1.0'').
Return TRUE if the last request was a HEAD request. No content
body must be generated for these requests.
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.
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 $HTTP::Daemon::PROTO variable is used.
Send the CRLF sequence to the client.
Send the status line and the ``Date:'' and ``Server:'' headers back to the client. This header is assumed to be continued and does not end with an empty CRLF line.
See the description of send_status_line() for the description of the
accepted arguments.
Write a HTTP::Response object to the
client as a response. We try hard to make sure that the response is
self delimiting so that the connection can stay persistent for further
request/response exchanges.
The content attribute of the HTTP::Response object can be a normal
string or a subroutine reference. If it is a subroutine, then
whatever this callback routine returns is written back to the
client as the response content. The routine will be called until it
return an undefined or empty value. If the client is HTTP/1.1 aware
then we will use chunked transfer encoding for the response.
Send a redirect response back to the client. The location ($loc) can be an absolute or relative URL. The $code must be one the redirect status codes, and defaults to ``301 Moved Permanently''
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.
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.
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.
Return a reference to the corresponding HTTP::Daemon object.
RFC 2616
the IO::Socket::INET manpage, the IO::Socket manpage
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.