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[Bug-wget] Support for long-haul high-bandwidth links

From: Andrew Daviel
Subject: [Bug-wget] Support for long-haul high-bandwidth links
Date: Wed, 9 Nov 2011 18:24:38 -0800 (PST)

When downloading a large file over a high-latency (e.g. long physical distance) high-bandwidth link, the download time is dominated by the round-trip time for TCP handshakes.

In the past tools such as bbftp have mitigated this effect by using multiple streams, but required both a special server and client.

Using the "range" header in HTTP/1.1, it is possible to start multiple simultaneous requests for different portions of a file using a standard Apache server, and achieve a significant speedup. I have a proof-of-principle Perl script using threads which was able to download a medium-sized file from Europe to Vancouver in half the normal time.

I wondered it this was of interest as an enhanscement for wget.

Andrew Daviel, TRIUMF, Canada

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