But of course I can't use global variables in my real code, since it will end with complete mess. So I have another problem - I have no idea how to put "$outgoing_headers" in private variable (I'll post my pseudo code with sub below):

You can't get away from global variables, you're monkeypatching :) but ok 

#!/usr/bin/perl --
use strict; use warnings;
use LWP;
Main( @ARGV );
exit( 0 );

sub snoop {
    use Net::HTTP::Methods; ## important
    my( $url ) = @_;
    no warnings 'redefine';
    my $original = \&Net::HTTP::Methods::format_request;
    my $outgoing_headers = '';
    local *Net::HTTP::Methods::format_request = sub {
        $outgoing_headers = $original->(@_);
    };;
    my $ua = LWP::UserAgent->new;
    my $response = $ua->get($url);
    warn "[Headers Out Real]\n", $outgoing_headers, "\n\n";
    warn "[Headers Out]\n", $response->request()->as_string(), "\n\n";
    warn "[Headers In]:\n", $response->headers()->as_string, "\n\n";
}

sub Main {
    snoop( 'http://example.com' );
#~     snoop( 'https://example.com' );## duh, internal response doesn'
+t trigger format_request
    snoop( 'https://google.com' );
}
__END__

[download]

To not monkey patch you can always implement your own LWP::Protocol::Ahttp and LWP::Protocol::Ahttps where you save the format_request somewhere in the request/response/or/lwp object , and register them, but that's just a different kind of global :)

In reply to Re^3: LWP is there any way to get "real" outgoing headers? by Anonymous Monk
in thread LWP is there any way to get "real" outgoing headers? by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.