A TRACE method HTTP request initiates a "loopback" diagnostic at the destination server. The destination server bounces back a TRACE response, with the virgin request message it received in the body of its response. A client can then check whether the original request correctly reached destination server or somewhere got changed by proxy or others.

The following diagram clearly explains the TRACE request :

The TRACE method is used primarily for diagnostics; i.e., verifying that requests are going through the request/response chain as intended. It's also a good tool for seeing the effects of proxies and other applications on your requests. For more click here

The simple perl program implementation of http TRACE method is as follows :
#!/usr/local/bin/perl -w
use strict;
use HTTP::Status;
use HTTP::Response;
use LWP::UserAgent;
use URI::URL;

sub sendandreceive( ) {

my ($method, $path) = @_;

# Create a User Agent object
my $ua = new LWP::UserAgent;

# Ask the User Agent object to request a URL.
# Results go into the response object (HTTP::Reponse).

my $request = new HTTP::Request($method,$path);
my $response = $ua->request($request);

# Parse/convert the response object for "easier reading"

my $code=$response->code;
my $desc = HTTP::Status::status_message($code);
my $headers=$response->headers_as_string;
my $body = $response->content;
$body = $response->error_as_HTML if ($response->is_error);
return ($code, $desc, $headers, $body);

print "Enter the url \n";
my $url=<STDIN>;
chomp $url;
my ($code, $desc, $headers, $body)=&sendandreceive('GET', $url);
print $code,"\n",$headers,"\n",$desc,"\n",$body,"\n";

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