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From Stefan Fritsch>
Subject Re: svn commit: r1406719 - in /httpd/httpd/trunk: CHANGES docs/log-message-tags/next-number include/http_core.h server/core.c server/protocol.c
Date Thu, 08 Nov 2012 10:26:55 GMT
On Wed, 7 Nov 2012, Tim Bannister wrote:
> On 7 Nov 2012, at 18:12, Stefan Fritsch wrote:
>> On Wed, 7 Nov 2012, Graham Leggett wrote:
>>>> New directive HttpProtocol which allows to disable HTTP/0.9 support.
>>> It feels wrong targeting 0.9 only, would it be possible to do this in a generic
way, say by listing the ones accepted, or by specifying a minimum?
>> Any suggestions for a syntax? Maybe:
>> HttpProtocol 1.1	# only 1.1
>> HttpProtocol 1.0-	# 1.0 and above
>> HttpProtocol 1.0-1.1	# 1.0 and 1.1
>> HttpProtocol -1.0	# 1.0 and below
> Does it need its own directive? How about a new environment variable and Require:
> Require expr %{HTTP_PROTOCOL} -gt 1.1
> I realise that won't work as things stand, because -gt only handles integers. Maybe another
binary operator could allow decimals?
> NB. SERVER_PROTOCOL would not be suitable because the initial “HTTP/” makes it harder
to do math.

I would prefer a dedicated directive: If you use authorization for that, 
you have to take care that it is not overriden by per-directory authz 
directives. Also, while evaluating an ap_expr is faster than e.g. using 
mod_lua, it is still a relatively complex operation. And I expect a lot of 
admins would like to disable 0.9, so having a way that has only minimal 
impact on performance would be better. Finally, I am not 100% sure that 
there are no code paths that cause a HTTP/0.9 error response to be sent 
before the Requrire or <If> is executed. The dedicated directive is 
certain to catch all uses of HTTP/0.9.
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