Re: [PATCH v7 1/2] http-backend: respect CONTENT_LENGTH as specified by rfc3875

[Jeff King <peff@peff.net>]

On Sun, Jun 03, 2018 at 12:27:48AM +0300, Max Kirillov wrote:

> http-backend reads whole input until EOF. However, the RFC 3875 specifies
> that a script must read only as many bytes as specified by CONTENT_LENGTH
> environment variable. Web server may exercise the specification by not closing
> the script's standard input after writing content. In that case http-backend
> would hang waiting for the input. The issue is known to happen with
> IIS/Windows, for example.
> 
> Make http-backend read only CONTENT_LENGTH bytes, if it's defined, rather than
> the whole input until EOF. If the variable is not defined, keep older behavior
> of reading until EOF because it is used to support chunked transfer-encoding.
> 
> Signed-off-by: Florian Manschwetus <manschwetus@cs-software-gmbh.de>
> [mk: fixed trivial build failures and polished style issues]
> Helped-by: Junio C Hamano <gitster@pobox.com>
> Signed-off-by: Max Kirillov <max@max630.net>
> ---
>  config.c       |  2 +-
>  config.h       |  1 +
>  http-backend.c | 43 ++++++++++++++++++++++++++++++++++++++++++-
>  3 files changed, 44 insertions(+), 2 deletions(-)

This first patch looks good to me, though it may be worth mentioning in
the commit message that we're only handling the buffered-input side here
(that is obvious to anybody reading this whole series now, but it may
help out people digging in the history later).

-Peff