netdev - Re: TCP: orphans broken by RFC 2525 #2.17

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Message-ID: <20100927202013.GA12373@1wt.eu>
Date:	Mon, 27 Sep 2010 22:20:13 +0200
From:	Willy Tarreau <w@....eu>
To:	Rick Jones <rick.jones2@...com>
Cc:	Herbert Xu <herbert@...dor.hengli.com.au>, netdev@...r.kernel.org
Subject: Re: TCP: orphans broken by RFC 2525 #2.17

On Mon, Sep 27, 2010 at 01:08:13PM -0700, Rick Jones wrote:
> Willy Tarreau wrote:
> >Hi Herbert,
> >
> >On Mon, Sep 27, 2010 at 04:02:22PM +0800, Herbert Xu wrote:
> >
> >>Willy Tarreau <w@....eu> wrote:
> >>
> >>>Looking more closely, I noticed that in traces showing the issue,
> >>>the client was sending an additional CRLF after the data in a
> >>>separate packet (permitted eventhough not recommended).
> >>
> >>Where is this permitted? RFC2616 says:
> >>
> >>	Certain buggy HTTP/1.0 client implementations generate
> >>	extra CRLF's after a POST request. To restate what is
> >>	explicitly forbidden by the BNF, an HTTP/1.1 client MUST
> >>	NOT preface or follow a request with an extra CRLF. 
> >
> >
> >And the paragraph just before says :
> >
> >   In the interest of robustness, servers SHOULD ignore any empty
> >   line(s) received where a Request-Line is expected. In other words, if
> >   the server is reading the protocol stream at the beginning of a
> >   message and receives a CRLF first, it should ignore the CRLF.
> 
> It is the HTTP server code being addressed there, not the underlying TCP 
> stack is it not?

yes, precisely.

regards,
Willy
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