String concatenation: 
#!/usr/bin/env perl
use 5.12.0;
use warnings;
use LWP::Simple;
use Data::Dumper;

say Dumper({ map {
    $_ => eval { get 'http://example.com/'.$_ },
  } 0..1000
});

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In reply to Re: iitterator variable in a LWP-UA-code snippet by Anonymous Monk
in thread itterator variable in a LWP-UA-code snippet by Perlbeginner1

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