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Date: Wed, 04 Jan 2012 20:17:42 +0100
From: Jeroen Geilman <jeroen@adaptr.nl>
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Subject: Re: [users@httpd] Invalid URI in request OPTIONS * HTTP/1.0

On 01/04/2012 12:36 PM, Szőts Ákos wrote:
> Hi All,
>
> There's a frequent error message in my Apache error_log (v2.2.21 under
> openSUSE 12.1):
> "Invalid URI in request OPTIONS * HTTP/1.0"
>
> I know this is an internal dummy connection to test if the server is alive
> or not. But every time, Apache tries to connect to itself, it writes
> instead of the error log.
>
> Here is the full request:
> OPTIONS * HTTP/1.0
> User-Agent: Apache (internal dummy connection)
>
> Response:
> HTTP/1.1 400 Bad Request
> Vary: accept-language,accept-charset,User-Agent
> Accept-Ranges: bytes
> Connection: close
> Content-Type: text/html; charset=iso-8859-1
> Content-Language: en
> Expires: Tue, 03 Jan 2012 19:31:04 GMT
>
> Here is the full "debug" log:
> [error] [client 194.38.104.110] Invalid URI in request OPTIONS * HTTP/1.0
> [debug] mod_headers.c(756): headers: ap_headers_output_filter()
> [debug] mod_headers.c(756): headers: ap_headers_output_filter()
> [debug] mod_headers.c(756): headers: ap_headers_output_filter()
> [debug] mod_headers.c(756): headers: ap_headers_output_filter()
> [error] [client 194.38.104.110] ModSecurity: Warning. String match "Invalid
> URI in request" at WEBSERVER_ERROR_LOG.
>
> I tried to telnet to my server on port 80, and when I write "OPTIONS *", I
> get a 400 error, but when I write "OPTIONS /", I got 200 OK.
> RFC says the * is acceptable, so I don't understand why the error.
>

An internal dummy connection will originate from localhost (127.0.0.1), 
not 194.138.104.110:

	[error] [client 194.38.104.110] ModSecurity: Warning. String match "Invalid URI in request" at WEBSERVER_ERROR_LOG.


As to the OPTIONS * request failing - make sure there are no hidden 
rewrite rules or other URI mangling going on.


-- 
J.


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