Fetching multiple documents uses the Keep-alive header, not pipelining. I do this with a current version of LWP with: 
  my $ua = LWP::UserAgent->new(keep_alive => 10)
      or die "Couldn't create LWP UserAgent\n";

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In reply to Re: HTTP/1.1 Pipelining with Perl? by sgifford
in thread HTTP/1.1 Pipelining with Perl? by Anonymous Monk

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