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.\" ========================================================================
.\"
.IX Title "Net::HTTP 3"
.TH Net::HTTP 3 "2004-04-06" "perl v5.8.4" "User Contributed Perl Documentation"
.SH "NAME"
Net::HTTP \- Low\-level HTTP connection (client)
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 4
\& use Net::HTTP;
\& my $s = Net::HTTP->new(Host => "www.perl.com") || die $@;
\& $s->write_request(GET => "/", 'User-Agent' => "Mozilla/5.0");
\& my($code, $mess, %h) = $s->read_response_headers;
.Ve
.PP
.Vb 7
\& while (1) {
\&    my $buf;
\&    my $n = $s->read_entity_body($buf, 1024);
\&    die "read failed: $!" unless defined $n;
\&    last unless $n;
\&    print $buf;
\& }
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \f(CW\*(C`Net::HTTP\*(C'\fR class is a low-level \s-1HTTP\s0 client.  An instance of the
\&\f(CW\*(C`Net::HTTP\*(C'\fR class represents a connection to an \s-1HTTP\s0 server.  The
\&\s-1HTTP\s0 protocol is described in \s-1RFC\s0 2616.  The \f(CW\*(C`Net::HTTP\*(C'\fR class
support \f(CW\*(C`HTTP/1.0\*(C'\fR and \f(CW\*(C`HTTP/1.1\*(C'\fR.
.PP
\&\f(CW\*(C`Net::HTTP\*(C'\fR is a sub-class of \f(CW\*(C`IO::Socket::INET\*(C'\fR.  You can mix the
methods described below with reading and writing from the socket
directly.  This is not necessary a good idea, unless you know what you
are doing.
.PP
The following methods are provided (in addition to those of
\&\f(CW\*(C`IO::Socket::INET\*(C'\fR):
.ie n .IP "$s = Net::HTTP\->new( %options )" 4
.el .IP "$s = Net::HTTP\->new( \f(CW%options\fR )" 4
.IX Item "$s = Net::HTTP->new( %options )"
The \f(CW\*(C`Net::HTTP\*(C'\fR constructor method takes the same options as
\&\f(CW\*(C`IO::Socket::INET\*(C'\fR's as well as these:
.Sp
.Vb 7
\&  Host:            Initial host attribute value
\&  KeepAlive:       Initial keep_alive attribute value
\&  SendTE:          Initial send_te attribute_value
\&  HTTPVersion:     Initial http_version attribute value
\&  PeerHTTPVersion: Initial peer_http_version attribute value
\&  MaxLineLength:   Initial max_line_length attribute value
\&  MaxHeaderLines:  Initial max_header_lines attribute value
.Ve
.Sp
The \f(CW\*(C`Host\*(C'\fR option is also the default for \f(CW\*(C`IO::Socket::INET\*(C'\fR's
\&\f(CW\*(C`PeerAddr\*(C'\fR.  The \f(CW\*(C`PeerPort\*(C'\fR defaults to 80 if not provided.
.Sp
The \f(CW\*(C`Listen\*(C'\fR option provided by \f(CW\*(C`IO::Socket::INET\*(C'\fR's constructor
method is not allowed.
.Sp
If unable to connect to the given \s-1HTTP\s0 server then the constructor
returns \f(CW\*(C`undef\*(C'\fR and $@ contains the reason.  After a successful
connect, a \f(CW\*(C`Net:HTTP\*(C'\fR object is returned.
.IP "$s\->host" 4
.IX Item "$s->host"
Get/set the default value of the \f(CW\*(C`Host\*(C'\fR header to send.  The \f(CW$host\fR
must not be set to an empty string (or \f(CW\*(C`undef\*(C'\fR) for \s-1HTTP/1\s0.1.
.IP "$s\->keep_alive" 4
.IX Item "$s->keep_alive"
Get/set the \fIkeep-alive\fR value.  If this value is \s-1TRUE\s0 then the
request will be sent with headers indicating that the server should try
to keep the connection open so that multiple requests can be sent.
.Sp
The actual headers set will depend on the value of the \f(CW\*(C`http_version\*(C'\fR
and \f(CW\*(C`peer_http_version\*(C'\fR attributes.
.IP "$s\->send_te" 4
.IX Item "$s->send_te"
Get/set the a value indicating if the request will be sent with a \*(L"\s-1TE\s0\*(R"
header to indicate the transfer encodings that the server can choose to
use.  If the \f(CW\*(C`Compress::Zlib\*(C'\fR module is installed then this will
announce that this client accept both the \fIdeflate\fR and \fIgzip\fR
encodings.
.IP "$s\->http_version" 4
.IX Item "$s->http_version"
Get/set the \s-1HTTP\s0 version number that this client should announce.
This value can only be set to \*(L"1.0\*(R" or \*(L"1.1\*(R".  The default is \*(L"1.1\*(R".
.IP "$s\->peer_http_version" 4
.IX Item "$s->peer_http_version"
Get/set the protocol version number of our peer.  This value will
initially be \*(L"1.0\*(R", but will be updated by a successful
\&\fIread_response_headers()\fR method call.
.IP "$s\->max_line_length" 4
.IX Item "$s->max_line_length"
Get/set a limit on the length of response line and response header
lines.  The default is 4096.  A value of 0 means no limit.
.IP "$s\->max_header_length" 4
.IX Item "$s->max_header_length"
Get/set a limit on the number of headers lines that a response can
have.  The default is 128.  A value of 0 means no limit.
.ie n .IP "$s\->format_request($method, $uri\fR, \f(CW%headers, [$content])" 4
.el .IP "$s\->format_request($method, \f(CW$uri\fR, \f(CW%headers\fR, [$content])" 4
.IX Item "$s->format_request($method, $uri, %headers, [$content])"
Format a request message and return it as a string.  If the headers do
not include a \f(CW\*(C`Host\*(C'\fR header, then a header is inserted with the value
of the \f(CW\*(C`host\*(C'\fR attribute.  Headers like \f(CW\*(C`Connection\*(C'\fR and
\&\f(CW\*(C`Keep\-Alive\*(C'\fR might also be added depending on the status of the
\&\f(CW\*(C`keep_alive\*(C'\fR attribute.
.Sp
If \f(CW$content\fR is given (and it is non\-empty), then a \f(CW\*(C`Content\-Length\*(C'\fR
header is automatically added unless it was already present.
.ie n .IP "$s\->write_request($method, $uri\fR, \f(CW%headers, [$content])" 4
.el .IP "$s\->write_request($method, \f(CW$uri\fR, \f(CW%headers\fR, [$content])" 4
.IX Item "$s->write_request($method, $uri, %headers, [$content])"
Format and send a request message.  Arguments are the same as for
\&\fIformat_request()\fR.  Returns true if successful.
.ie n .IP "$s\->format_chunk( $data )" 4
.el .IP "$s\->format_chunk( \f(CW$data\fR )" 4
.IX Item "$s->format_chunk( $data )"
Returns the string to be written for the given chunk of data.  
.IP "$s\->write_chunk($data)" 4
.IX Item "$s->write_chunk($data)"
Will write a new chunk of request entity body data.  This method
should only be used if the \f(CW\*(C`Transfer\-Encoding\*(C'\fR header with a value of
\&\f(CW\*(C`chunked\*(C'\fR was sent in the request.  Note, writing zero-length data is
a no\-op.  Use the \fIwrite_chunk_eof()\fR method to signal end of entity
body data.
.Sp
Returns true if successful.
.ie n .IP "$s\->format_chunk_eof( %trailers )" 4
.el .IP "$s\->format_chunk_eof( \f(CW%trailers\fR )" 4
.IX Item "$s->format_chunk_eof( %trailers )"
Returns the string to be written for signaling \s-1EOF\s0 when a
\&\f(CW\*(C`Transfer\-Encoding\*(C'\fR of \f(CW\*(C`chunked\*(C'\fR is used.
.ie n .IP "$s\->write_chunk_eof( %trailers )" 4
.el .IP "$s\->write_chunk_eof( \f(CW%trailers\fR )" 4
.IX Item "$s->write_chunk_eof( %trailers )"
Will write eof marker for chunked data and optional trailers.  Note
that trailers should not really be used unless is was signaled
with a \f(CW\*(C`Trailer\*(C'\fR header.
.Sp
Returns true if successful.
.ie n .IP "($code, $mess\fR, \f(CW%headers\fR) = \f(CW$s\fR\->read_response_headers( \f(CW%opts )" 4
.el .IP "($code, \f(CW$mess\fR, \f(CW%headers\fR) = \f(CW$s\fR\->read_response_headers( \f(CW%opts\fR )" 4
.IX Item "($code, $mess, %headers) = $s->read_response_headers( %opts )"
Read response headers from server and return it.  The \f(CW$code\fR is the 3
digit \s-1HTTP\s0 status code (see HTTP::Status) and \f(CW$mess\fR is the textual
message that came with it.  Headers are then returned as key/value
pairs.  Since key letter casing is not normalized and the same key can
even occur multiple times, assigning these values directly to a hash
is not wise.  Only the \f(CW$code\fR is returned if this method is called in
scalar context.
.Sp
As a side effect this method updates the 'peer_http_version'
attribute.
.Sp
Options might be passed in as key/value pairs.  There are currently
only two options supported; \f(CW\*(C`laxed\*(C'\fR and \f(CW\*(C`junk_out\*(C'\fR.
.Sp
The \f(CW\*(C`laxed\*(C'\fR option will make \fIread_response_headers()\fR more forgiving
towards servers that have not learned how to speak \s-1HTTP\s0 properly.  The
\&\f(CW\*(C`laxed\*(C'\fR option is a boolean flag, and is enabled by passing in a \s-1TRUE\s0
value.  The \f(CW\*(C`junk_out\*(C'\fR option can be used to capture bad header lines
when \f(CW\*(C`laxed\*(C'\fR is enabled.  The value should be an array reference.
Bad header lines will be pushed onto the array.
.Sp
The \f(CW\*(C`laxed\*(C'\fR option must be specified in order to communicate with
pre\-HTTP/1.0 servers that don't describe the response outcome or the
data they send back with a header block.  For these servers
peer_http_version is set to \*(L"0.9\*(R" and this method returns (200,
\&\*(L"Assumed \s-1OK\s0\*(R").
.Sp
The method will raise an exception (die) if the server does not speak
proper \s-1HTTP\s0 or if the \f(CW\*(C`max_line_length\*(C'\fR or \f(CW\*(C`max_header_length\*(C'\fR
limits are reached.  If the \f(CW\*(C`laxed\*(C'\fR option is turned on and
\&\f(CW\*(C`max_line_length\*(C'\fR and \f(CW\*(C`max_header_length\*(C'\fR checks are turned off,
then no exception will be raised and this method will always
return a response code.
.ie n .IP "$n = $s\fR\->read_entity_body($buf, \f(CW$size);" 4
.el .IP "$n = \f(CW$s\fR\->read_entity_body($buf, \f(CW$size\fR);" 4
.IX Item "$n = $s->read_entity_body($buf, $size);"
Reads chunks of the entity body content.  Basically the same interface
as for \fIread()\fR and \fIsysread()\fR, but the buffer offset argument is not
supported yet.  This method should only be called after a successful
\&\fIread_response_headers()\fR call.
.Sp
The return value will be \f(CW\*(C`undef\*(C'\fR on read errors, 0 on \s-1EOF\s0, \-1 if no data
could be returned this time, otherwise the number of bytes assigned
to \f(CW$buf\fR.  The \f(CW$buf\fR set to "" when the return value is \-1.
.Sp
This method will raise exceptions (die) if the server does not speak
proper \s-1HTTP\s0.  This can only happen when reading chunked data.
.ie n .IP "%headers = $s\->get_trailers" 4
.el .IP "%headers = \f(CW$s\fR\->get_trailers" 4
.IX Item "%headers = $s->get_trailers"
After \fIread_entity_body()\fR has returned 0 to indicate end of the entity
body, you might call this method to pick up any trailers.
.IP "$s\->_rbuf" 4
.IX Item "$s->_rbuf"
Get/set the read buffer content.  The \fIread_response_headers()\fR and
\&\fIread_entity_body()\fR methods use an internal buffer which they will look
for data before they actually sysread more from the socket itself.  If
they read too much, the remaining data will be left in this buffer.
.IP "$s\->_rbuf_length" 4
.IX Item "$s->_rbuf_length"
Returns the number of bytes in the read buffer.  This should always be
the same as:
.Sp
.Vb 1
\&    length($s->_rbuf)
.Ve
.Sp
but might be more efficient.
.SH "SUBCLASSING"
.IX Header "SUBCLASSING"
The \fIread_response_headers()\fR and \fIread_entity_body()\fR will invoke the
\&\fIsysread()\fR method when they need more data.  Subclasses might want to
override this method to control how reading takes place.
.PP
The object itself is a glob.  Subclasses should avoid using hash key
names prefixed with \f(CW\*(C`http_\*(C'\fR and \f(CW\*(C`io_\*(C'\fR.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\s-1LWP\s0, IO::Socket::INET, Net::HTTP::NB
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2001\-2003 Gisle Aas.
.PP
This library is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.