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Date: Wed, 25 Jul 2007 11:42:46 +0100
From: Nick Kew <nick@webthing.com>
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Subject: Re: [users@httpd] mod_rewrite, mod_proxy and content-length

On Wed, 25 Jul 2007 10:59:33 +0100
"Daniel JavaDev" <dan.javadev@googlemail.com> wrote:

> Unfortunately it's not my client, but Nokia's EAIF MMSC (emulator in
> this case).
> 
> Like I said, I've coded my application to the protocol (EAIF) and it
> works. I only need to add apache httpd in between in order to
> restrict access to the application (by IP address range).

Do you mean EAIF is a protocol that looks like something-over-HTTP
but is too poorly thought out to work over HTTP?

> As you can see, httpd is replacing Transfer-Encoding with C-L, which
> is breaking things.

AFAICT HTTP permits a proxy to do that.  If you think otherwise,
please point to the relevant section in RFC2616.

> I've used 'SetEnv proxy-sendchunked 1' in my httpd config, but it did
> not make a difference.

That's for requests, not responses.  An HTTP/1.0 server (or client)
is not required to accept chunked encoding.  That setting means Apache
can proxy HTTP/1.0 without having to sacrifice efficiency with HTTP/1.1.

> I'm tempted to hack the mod_proxy code but only has a last resort.
> Surely there must be some way to configure httpd to stick with the
> original headers.

I'm not sure: it's not something anyone's raised before (AFAIK).
If mod_headers doesn't help (and I suspect it won't, as it comes
before the protocol filter), then you'll have to hack the code.
The good news is: it's probably as simple as setting r->chunked = 1
at the right point, and perhaps removing the Content-Length filter,
if your environment variable is set to do that.

If you do that, you might want to contribute your patch back.
Under bugzilla, you could enter it as an enhancement request
something like "support EAIF protocol in the proxy".

-- 
Nick Kew

Application Development with Apache - the Apache Modules Book
http://www.apachetutor.org/

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