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Re: Re: Re: download part of remote files

by merlyn (Sage)
on Mar 08, 2001 at 02:50 UTC ( #62859=note: print w/ replies, xml ) Need Help??


in reply to Re: Re: download part of remote files
in thread download part of remote files

RFC2068 (HTTP/1.1) describes a partial-content protocol. If a response comes back with "Accept-Ranges: bytes" then you may ask for "Range: bytes=-128" in a request, and get just the last 128 bytes. That'd be like this:

my $url = "http://www.server.com/filename.mp3"; use LWP::UserAgent; my $ua = LWP::UserAgent->new; use HTTP::Request::Common; my $response = $ua->simple_request(GET $url, Range => 'bytes=-128'); if ($response->is_success) { print "last 128 bytes is: ", substr($response->content, -128), "\n"; print "(although entire content was retrieved)\n" if length ($respon +se->content) > 128; }
Note that if the range request is not honored, you'll get back the entire content instead. If you wanted, you can probe first to see if the "Accept-ranges" header is in the response for that particular URL.

-- Randal L. Schwartz, Perl hacker


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