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Hello. Trying to use HTTP::Async to do some concurrent downloading, but it seems to take much longer than a traditional HTTP request made with LWP::UserAgent.

Minimal code below. I do a grab of a URL (I've replaced my internal URLs with a URL from the BBC website). When I run it I get:-

Doing it 1st way 1360837557 doing request 1360837557 done 1360837557 DEBUG: Status is: 200 OK 1360837557 LENGTH: 153421 1360837557 Doing it 2nd way 1360837557 NEWPOLL ADDED: 1 1360837557 DEBUG: Checking... 1360837558 DEBUG: Checking... 1360837559 DEBUG: Checking... 1360837561 DEBUG: Checking... 1360837562 DEBUG: Checking... 1360837563 DEBUG: Checking... 1360837564 DEBUG: Checking... 1360837565 DEBUG: Checking... 1360837566 DEBUG: Checking... 1360837567 DEBUG: Checking... 1360837568 DEBUG: Got response reqid=1 1360837568 DEBUG: Status is: 200 OK 1360837568 LENGTH: 151059

So the first attempt (via LWP) completes in a fraction of a second. The subsequent request (using HTTP::Async) takes 11 seconds or so. Looking at the tcpdump of the requests being sent I can't really see any difference between the two. And both are made by the same call to HTTP::Request anyway.

Code follows:-

#!/usr/bin/perl # Turn of auto flush for stdout $|=1; use HTTP::Async; use HTTP::Request::Common qw(POST); use LWP::UserAgent; use strict; binmode STDOUT, ":utf8"; my $http_async = HTTP::Async->new( poll_interval => 0.05 ); my $url="http://www.bbc.co.uk/sport/0/"; # $url="http://www.google.com/"; print "Doing it 1st way\n"; my $ua=LWP::UserAgent->new; print time()." doing request\n"; my $resp=$ua->request( HTTP::Request->new( "GET", $url ) ); print time()." done\n"; print time()." DEBUG: Status is: ".$resp->status_line."\n"; print time()." LENGTH: ".length($resp->as_string)."\n"; print time()." Doing it 2nd way\n"; my $reqid = $http_async->add( HTTP::Request->new( "GET", $url ) ); print time()." NEWPOLL ADDED: $reqid\n"; while( 1 ) { # Check for any results if( $http_async->empty() ) { print time()." DEBUG: to_send=".$http_async->to_send_c +ount." in_progress=".$http_async->in_progress_count." to_return=".$ht +tp_async->to_return_count." total=".$http_async->total_count."\n"; sleep(1); next; } print time()." DEBUG: Checking...\n"; my ( $resp, $reqid ) = $http_async->wait_for_next_response(1.0 +); if( !defined( $resp ) ) { next; } print time()." DEBUG: Got response reqid=$reqid\n"; print time()." DEBUG: Status is: ".$resp->status_line."\n"; print time()." LENGTH: ".length($resp->as_string)."\n"; last; }

Any ideas?


In reply to Slow HTTP::Async responses by alexkus

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