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Re: [#95] Multiple Content-Lengths

From: Adam Barth <w3c@adambarth.com>
Date: Wed, 22 Sep 2010 14:33:20 -0700
Message-ID: <AANLkTikUJXFueO4UGtkwEK08vMRgDO_jEpEtFGrspZU7@mail.gmail.com>
To: Bjoern Hoehrmann <derhoermi@gmx.net>
Cc: Julian Reschke <julian.reschke@gmx.de>, HTTP Working Group <ietf-http-wg@w3.org>
On Wed, Sep 22, 2010 at 1:22 PM, Bjoern Hoehrmann <derhoermi@gmx.net> wrote:
> * Julian Reschke wrote:
>>Agreed, but it makes the spec more complex, and it's not sure whether
>>it's worth the special case (that's why statistical data would be useful).
>
> Earlier this week I had http://cutycapt.sf.net/ load a bunch of URLs
> (random selection of pages linked from the german Wikipedia, at most
> three per host) resulting in about 125,000 requests. There was not a
> single response with both Transfer-Encoding and Content-Length, or two
> or more Content-Length headers, or Content-Length headers with any-
> thing but digits and white space (especially no commas). Neither does
> this happen for the Alexa 1000. Obviously this does not include certain
> things like responses resulting from user interaction (say, posting to
> a forum).
>
> It's a lot harder these days to get webservers send out messages with
> broken framing, thanks to improvements to script interpreters, web
> servers, and the interfaces between them, than it was a few years ago.
>
> (The usual strange things are included, like headers that end up as
> a reason phrase in the status line of the response ala "HTTP/1.0 200
> OKContent-Type: text/html; char..."; portugese appears to be the most
> popular language second to english in the reason phrase by the way,
> followed by german and serbian...)

As a control, did you look for multiple Content-Type headers?  I know
that these occur frequently enough that it's important to use the last
one if you're not IE (i.e., if you actually use the Content-Type
header for something).

Adam
Received on Wednesday, 22 September 2010 22:04:06 GMT

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