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From: Jeff King <peff@peff.net>
To: Jonathan Nieder <jrnieder@gmail.com>
Cc: "Max Kirillov" <max@max630.net>,
	git@vger.kernel.org, "Jelmer Vernooij" <jelmer@jelmer.uk>,
	"Florian Manschwetus" <manschwetus@cs-software-gmbh.de>
Subject: Re: [PATCH] http-backend: Treat empty CONTENT_LENGTH as zero
Date: Mon, 10 Sep 2018 22:30:25 -0400
Message-ID: <20180911023025.GA7739@sigill.intra.peff.net> (raw)
In-Reply-To: <20180911022028.GA20518@aiede.svl.corp.google.com>

On Mon, Sep 10, 2018 at 07:20:28PM -0700, Jonathan Nieder wrote:

> Jeff King wrote:
> > On Mon, Sep 10, 2018 at 02:22:21PM -0700, Jonathan Nieder wrote:
> 
> >> Thanks.  I am wondering if we should go all the way and do
> >>
> >> 	ssize_t val;
> >> 	const char *str = getenv("CONTENT_LENGTH");
> >>
> >> 	if (!str || !*str)
> >> 		return 0;
> >> 	if (!git_parse_ssize_t(str, &val))
> >> 		die(...);
> >> 	return val;
> >>
> >> That would match the RFC, but it seems to make t5510-fetch.sh hang,
> [...]
> >> Do you know why?
> >
> > Yes. :)
> >
> > It's due to this comment in the patch you are replying to:
> >
> > +       if (!str) {
> > +               /*
> > +                * RFC3875 says this must mean "no body", but in practice we
> > +                * receive chunked encodings with no CONTENT_LENGTH. Tell the
> > +                * caller to read until EOF.
> > +                */
> > +               val = -1;
> 
> Ah!  So "in practice" includes "in Apache".  An old discussion[1] on
> Apache's httpd-users list agrees.
> 
> The question then becomes: what does IIS do for zero-length requests?
> Does any other web server fail to support "read until EOF" in general?
> 
> The CGI standard does not cover chunked encoding so we can't lean on
> the standard for advice.  It's not clear to me yet whether this patch
> improves on what's in "master".

I'd note that the case in question (no CONTENT_LENGTH at all) is not
changed between this patch and master. It's only the case of
CONTENT_LENGTH set to an empty string. But I agree that it is not clear
to me whether it is actually improving anything in practice.

-Peff

  reply index

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-06  6:10 CONTENT_LENGTH can no longer be empty Jonathan Nieder
2018-09-06 19:35 ` [PATCH] http-backend: allow empty CONTENT_LENGTH Max Kirillov
2018-09-06 21:54   ` Junio C Hamano
2018-09-07  3:27     ` Max Kirillov
2018-09-07  3:38       ` Jeff King
2018-09-07  4:20         ` Max Kirillov
2018-09-07  4:59         ` Max Kirillov
2018-09-07  9:49           ` Junio C Hamano
2018-09-08  5:41             ` Max Kirillov
2018-09-09  4:40             ` Max Kirillov
2018-09-06 22:45   ` Jonathan Nieder
2018-09-07  3:36   ` [PATCH v2] " Max Kirillov
2018-09-09  4:10     ` [PATCH v4] " Max Kirillov
2018-09-10  5:25       ` Jonathan Nieder
2018-09-10 13:17         ` Jeff King
2018-09-10 16:37           ` Junio C Hamano
2018-09-10 18:46             ` Jeff King
2018-09-10 20:53         ` [PATCH] http-backend: Treat empty CONTENT_LENGTH as zero Max Kirillov
2018-09-10 21:22           ` Jonathan Nieder
2018-09-11  1:55             ` Jeff King
2018-09-11  2:20               ` Jonathan Nieder
2018-09-11  2:30                 ` Jeff King [this message]
2018-09-11  1:58           ` Jeff King
2018-09-11  3:42           ` [PATCH] http-backend: treat " Jonathan Nieder
2018-09-11  4:03             ` Jonathan Nieder
2018-09-11 18:15               ` Junio C Hamano
2018-09-11 18:27                 ` Junio C Hamano
2018-09-12  5:56                 ` Jeff King
2018-09-12  6:26                   ` Jonathan Nieder
2018-09-12 16:10                   ` Junio C Hamano
2018-09-11  4:18             ` Junio C Hamano
2018-09-11  4:29               ` Jonathan Nieder
2018-09-08  0:19 [PATCH v2] http-backend: allow empty CONTENT_LENGTH Jonathan Nieder
2018-09-08  5:35 ` Max Kirillov
2018-09-08  5:42 ` [PATCH v3] " Max Kirillov
2018-09-10  5:17   ` Jonathan Nieder
2018-09-10 20:36     ` Max Kirillov
2018-09-11  4:06 Jonathan Nieder
2018-09-11 20:33 ` [PATCH v2] http-backend test: make empty CONTENT_LENGTH test more realistic Max Kirillov

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