Says ichimunki:

Since you're being incredibly helpful, can I impose on you further than anon_monk did?
Um, no. Now you're asking me to read you the manual. If you read it and you don't understand, then I will try to answer. You could also try writing a few small example programs to test out your guesses about how it works.

is there a way to insert a last/return clause into the callback which aborts the request?

The general pattern for such things in Perl is: 

    eval { $ua->request($request, \&callback, 4096) };
    if ($@ =~ /^Request aborted/) {
      # handle aborted request
    } elsif ($@) {
      die;
    }
    
    sub callback {
      # ...
      die "Request aborted" if ...;
      # ...
    }

[download]

In reply to Re: Current download information.. by Dominus
in thread Current download information.. 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.