Too many 400 bad request

[Maxim Dounin]

Hello!

On Wed, Aug 22, 2012 at 12:38:23PM +0800, Christopher Meng wrote:

> Hi everyone,
> 
> I've deployed a server for rsync public mirror,and I use nginx as web
> server to display some html for visitors.
> 
> Now the problem is, too many 400 errors.
> 
> I paste "only a small amount of them" below:
> 
> =================================
> 216.216.33.242 - - [21/Aug/2012:03:02:05 -0700] "-" 400 0 "-" "-" "-"
> 174.128.254.98 - - [21/Aug/2012:03:02:05 -0700] "-" 400 0 "-" "-" "-"
> 216.216.33.242 - - [21/Aug/2012:03:02:05 -0700] "-" 400 0 "-" "-" "-"

Try looking e.g. here for a possible cause:
http://mailman.nginx.org/pipermail/nginx/2011-September/029045.html

At least Chrome is known to cause such log entries if there aren't 
many resources on a page requested due to additional connections 
being open and then closed without sending any single request in 
them.

[...]

> Well,this really make me confused.And I've asked other mirror admins who
> use nginx,they all have this problem.
> 
> Is it caused by nginx?
> Do anyone know the solution?
> Thanks.

It's just a way how nginx logs connections which are just opened 
and then closed.  Confusing part is that some other web servers 
doesn't seem to log anything in this case.

Maxim Dounin