Nginx double requests for my upstreams?

[funkdoobiest]

Maxim Dounin Wrote:
-------------------------------------------------------
> Hello!
> 
> On Mon, Jun 22, 2009 at 10:19:54PM -0400,
> funkdoobiest wrote:
> 
> > Hi Maxim,
> > 
> > I have checked the nginx-access logs and I found
> following:
> > 
> > 84.72.240.XXX - - [03/Jun/2009:16:38:46 +0200]
> "POST /premium/paypremium HTTP/1.1" 499 0
> "http://www.host.com/premium/getpremium/"
> "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT
> 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)"
> > 84.72.240.XXX - - [03/Jun/2009:16:38:48 +0200]
> "POST /premium/paypremium HTTP/1.1" 200 2230
> "http://www.host.com/premium/getpremium/"
> "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT
> 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)"
> > 
> > 
> > 
> > What can I do or what do I wrong?
> 
> Error code 499 means that *client* closed
> connection before it got 
> response.  In this particular case it looks like
> duplicate form 
> submit, e.g. due to second click on submit
> button.
> 
> Maxim Dounin

I got this 499 error code for about 10% of all the connections. not just for form-submits.
It seems that "proxy_ignore_client_abort on;" fix that problem. But why? Is it ok to ignore client aborts?

Jan

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,2644,3293#msg-3293