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Re: [Bug-wget] TCP Fast Open for HTTP

From: Hubert Tarasiuk
Subject: Re: [Bug-wget] TCP Fast Open for HTTP
Date: Thu, 28 May 2015 00:49:42 +0200
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I have talked with Giuseppe and he suggested that we might not do TCP
Fast Open support for FTP at this time (he argued that FTP is slow
either way :).

Instead I might focus on implementing some basics of Metalink protocol
for HTTP and FTP resources in Wget.

Do you have any thoughts about that?

W dniu 28.05.2015 o 00:41, Hubert Tarasiuk pisze:
> Hello Wget developers,
> I have prepared TCP Fast Open support for HTTP requests in Wget.
> I have prepared sample TCP segment dump to show how it works:
> https://github.com/jy987321/Wget/wiki/TCP-TFO
> The TFO is disabled by default and can be enabled using --tcp-fast-open
> option when running Wget.
> The support for TFO has been added only recently to Linux kernel (3.6
> for client and 3.7 for server) and is not supported on Winodws AFAIK.
> Therefore, it is added as conditional compilation code. In order to
> force the use of it, you can pass --enable-tcp-tfo (--disable-tcp-tfo)
> to ./configure script. The default is to include the code if possible
> (if required constants are defined in <sys/socket.h>).
> The support for TFO has been added to Python test suite. In order to
> make it work, you need to enable both client-side and server-side TFO
> support in your Linux kernel:
> $ echo 3 > /proc/sys/net/ipv4/tcp_fastopen
> If there is no server-side support, TCP will transparently fall back to
> using traditional 3-way handshake.
> Please let me know what do you think of this feature. Suggestions or
> comments about patches are more than welcome.
> The code is available as attachment and on Github.
> https://github.com/jy987321/Wget/commits/master-hubert
> PS
> I was hoping to do some performance tests, but have not found too many
> servers that support TFO (actually it is only google.com that I have
> found so far).

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