Forum: NGINX How can i block these requests

I am getting following access.log: and are significant in number
RequestMethod=- RequestURI=- HTTPStatus=400  BodyBytesSent=0
RequestTime=0.000  ResponseTime=-  HTTPReferrer="-" UserAgent="-"
X-Forwarded-For=- HTTPStatus=400

Does anyone know why i am getting these empty requests, and how to stop
them.

Posted at Nginx Forum: 
http://forum.nginx.org/read.php?2,232321,232321#msg-232321

On Oct 29, 2012 8:09 PM, "nilesh" <nginx-forum@nginx.us> wrote:
>
> I am getting following access.log: and are significant in number
> RequestMethod=- RequestURI=- HTTPStatus=400  BodyBytesSent=0
> RequestTime=0.000  ResponseTime=-  HTTPReferrer="-" UserAgent="-"
> X-Forwarded-For=- HTTPStatus=400
>
> Does anyone know why i am getting these empty requests, and how to stop
> them.
>

That's modern browser's keepalive

> Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,232321,232321#msg-232321

Thanks for the pointer Edho,
right now we are getting these log entries at a rate of 5000 per hour 
per
server, and we have multiple nginx installations, and this is almost
flooding our centralized logging system. Is there a way to disable 
logging
such requests, or lower the number of occurrences (like tweaking the 
keep
alive timeout value or number of requests)?

thanks in advance
ranjib

On Tue, Oct 30, 2012 at 12:13 PM, Ranjib Dey <dey.ranjib@gmail.com> 
wrote:
>
Maybe something like this will work (untested)

error_page 400 /400.html;
location = /400.html {
  access_log off;
}