Re: Protocol design: the Gemini project

Joseph Touch <touch@strayalpha.com> Tue, 01 December 2020 18:27 UTC

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Subject: Re: Protocol design: the Gemini project
From: Joseph Touch <touch@strayalpha.com>
In-Reply-To: <CAMm+Lwj9ecWvdjbPBwtuYYSEWLnracXgOKjTbFar8PGueRtfug@mail.gmail.com>
Date: Tue, 01 Dec 2020 10:27:06 -0800
Cc: Stephane Bortzmeyer <bortzmeyer@nic.fr>, IETF Discussion Mailing List <ietf@ietf.org>
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To: Phillip Hallam-Baker <phill@hallambaker.com>
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Speaking of false...

> On Dec 1, 2020, at 8:40 AM, Phillip Hallam-Baker <phill@hallambaker.com> wrote:
> 
> ...
> Having (re)implemented FTP for LIBWWW, I can assure you that it was done for very good reason.
> 
> FTP is not really an independent protocol. It is actually designed as a feature add on for Telnet. As a result, FTP is vastly less efficient than HTTP because you have two socket creations and teardowns per connection. 

FTP needs only N+1 connections per set of N transfers from a given site.

You should never need to close and reopen the control connection unless you leave the site.

> FTP requires multiple control plane interactions where HTTP requires only one.

You can specify an entire transfer with one command.

> FTP has no provision for transfer of metadata.

FTP has both records and data structures.

> FTP doesn't support proxying or caching, both of which were essential in the early Web when bandwidth was severely constrained.

FTP has third party transfers, which are a much more powerful mechanism than simply proxying. It can cache just like HTTP can (that’s an implementation issue) - and can prefetch too:
Touch, J; Farber, D: An Experiment in Latency Reduction <>. In: Infocom, pp. 175-181, IEEE, 1994.

Joe