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From: Jonathan Nieder <jrnieder@gmail.com>
To: Jeff King <peff@peff.net>
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 19:20:28 -0700
Message-ID: <20180911022028.GA20518@aiede.svl.corp.google.com> (raw)
In-Reply-To: <20180911015553.GA5838@sigill.intra.peff.net>

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".

Thanks,
Jonathan

[1] http://mail-archives.apache.org/mod_mbox/httpd-users/200909.mbox/%3C4AAACC38.3070200@rowe-clan.net%3E

  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 [this message]
2018-09-11  2:30                 ` Jeff King
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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