NAME

Net::ICAP::Client - A client implementation of the ICAP (RFC 3507) protocol

VERSION

Version 0.08

SYNOPSIS

use Net::ICAP::Client;

my $icap = Net::ICAP::Client->new('icap://icap-proxy.example.com/');
my $request = HTTP::Request->new( 'POST' => 'https://www.example.com/path' );
my ( $headers, $body ) = $icap->request( $request );
if ($headers->isa('HTTP::Request') {
    # forward request to intended destination
} elsif ($headers->isa('HTTP::Response') {
    # return response to original requestor
}

DESCRIPTION

This module provides a client interface to an ICAP (RFC 3507) Server. ICAP Servers are designed to inspect and modify HTTP Request and Responses before the Request is passed to backend systems or the Response goes back to the user.

SUBROUTINES/METHODS

new

my $icap = Net::ICAP::Client->new('icap://icap-proxy.example.com/');
my $icap = Net::ICAP::Client->new('icaps://icap-proxy.example.com/', SSL_ca_path => '/path/to/ca-bundle.crt', %other_IO_SSL_Socket_options);

By default, the SSL_verifycn_scheme, SSL_verifycn_name and SSL_verify_mode parameters are automatically set for icaps URIs, but these parameters may be overridden.

debug

$icap->debug() accepts an optional debug value and returns the current debug value

allow_204

$icap->allow_204() accepts an optional value to set whether the client will send an Allow: 204 and returns the current setting

allow_preview

$icap->allow_preview() accepts an optional value to set whether the client will send an Preview and returns the current setting

agent

$icap->agent() accepts an optional User Agent string and returns the current User Agent string

server_allows_204

$icap->server_allows_204() returns true if the remote ICAP server can return a 204 (No modification needed) response. This method will issue an OPTIONS call to the remote server unless another OPTIONS call has been sent in the last ttl seconds.

is_tag

$icap->is_tag() returns the value of the remote ICAP server's ISTag header. This method will issue an OPTIONS call to the remote server unless another OPTIONS call has been sent in the last ttl seconds.

service

$icap->service() returns the value of the remote ICAP server's Service header. This method will issue an OPTIONS call to the remote server unless another OPTIONS call has been sent in the last ttl seconds.

ttl

$icap->ttl() returns the value of the remote ICAP server's Options-TTL header. This method will issue an OPTIONS call to the remote server unless another OPTIONS call has been sent in the last ttl seconds.

max_connections

$icap->max_connections() returns the value of the remote ICAP server's Max-Connections header. This method will issue an OPTIONS call to the remote server unless another OPTIONS call has been sent in the last ttl seconds.

preview_size

$icap->preview_size() returns the value of the remote ICAP server's Preview header. This method will issue an OPTIONS call to the remote server unless another OPTIONS call has been sent in the last ttl seconds.

uri

$icap->uri() returns the current URI of the remote ICAP server as a URI object.

request

my $icap = Net::ICAP::Client->new('icap://icap-proxy.example.com/');
my $request_headers = HTTP::Headers->new();
my $request = HTTP::Request->new( 'POST' => "https://www.example.com/path?name=value", $request_headers, "name2=value2" );
my ( $request_or_response_headers, $filehandle_containing_possibly_updated_body ) = $icap->request( $request, $filehandle_containing_request_body );

$icap->request() expects an HTTP::Request object and an optional filehandle. It will return an HTTP::Request or an HTTP::Response object containing the request or response without the body and a filehandle containing the body.

response

my $icap = Net::ICAP::Client->new('icap://icap-proxy.example.com/');
my $response = HTTP::Response->new( '200', 'OK' );
my ( $response_headers, $filehandle_containing_possibly_updated_body ) = $icap->response( $optional_request_or_undef, $response, $filehandle_containing_response_body );

$icap->response() expects an HTTP::Request object (if available), an HTTP::Response object and an optional filehandle. It will return an HTTP::Response object containing the response without the response body and a filehandle containing the response body.

AUTHOR

David Dick, <ddick at cpan.org>

DIAGNOSTICS

• Failed to write to icap server at %s

  Failed to write to the remote icap server. Check network status.

• Failed to write to STDERR

  Failed to write to STDERR. Check local machine settings.

• Incorrectly formatted debug line

  A debug call was made without being prefixed with a '>> ' or '<< '. This is a bug in Net::ICAP::Client

• Failed to connect to %s on port %s

  The connection to the remote icap server failed. Check network/SSL/TLS settings and status

• Failed to read from %s

  Failed to read from the remote icap server. Check network status

• Failed to seek to start of temporary file

  Failed to do a disk operation. Check disk settings for the mount point belonging to where temp files are being created

• Failed to seek to start of content handle

  Failed to do a disk operation. Check disk settings for the mount point belonging to the file that are passed into the request/response method

• ICAP Server returned a %s error

  The remote ICAP server returned an error. The TCP connection to the remote ICAP server will be automatically disconnected. Capture the network traffic and enter a bug report

• Failed to parse chunking length

  This is a bug in Net::ICAP::Client

• Unable to parse Encapsulated header

  The remote ICAP server did not return an Encapsulated header that could be understood by Net::ICAP::Client. Capture the network traffic and enter a bug report

• Unable to parse ICAP header

  The remote ICAP server did not return an ICAP header that could be understood by Net::ICAP::Client. Capture the network traffic and enter a bug report

• Failed to read from content handle

  Failed to do a disk operation. Check disk settings for the mount point belonging to the file that are passed into the request/response method

CONFIGURATION AND ENVIRONMENT

Net::ICAP::Client requires no configuration files or environment variables.

DEPENDENCIES

Net::ICAP::Client requires the following non-core modules

HTTP::Request
HTTP::Response
IO::Socket::INET
IO::Socket::SSL
URI

INCOMPATIBILITIES

None reported

BUGS AND LIMITATIONS

To report a bug, or view the current list of bugs, please visit https://github.com/david-dick/net-icap-client/issues

LICENSE AND COPYRIGHT

Copyright 2016 David Dick.

This program is free software; you can redistribute it and/or modify it under the terms of either: the GNU General Public License as published by the Free Software Foundation; or the Artistic License.

See http://dev.perl.org/licenses/ for more information.