Client closed keepalive connection

[Wilson Bilkovich]

On 4/27/07, Igor Sysoev <is at rambler-co.ru> wrote:
> On Fri, Apr 27, 2007 at 01:39:40PM -0400, Wilson Bilkovich wrote:
>
> > I am having some difficulty with nginx as a load balancer on MacOS X
> > (Intel).
> > I am running 0.5.19, but the problem occurs with recent earlier
> > versions as well.
> >
> > With "use kqueue"
> > 2007/04/26 22:26:15 [info] 4133#0: *3048 kevent() reported that client
> > 192.168.0.100 closed keepalive connection
> >
> > With "use poll"
> > 2007/04/26 22:59:48 [info] 10189#0: *375 client 192.168.0.100 closed
> > keepalive connection
> >
> > On the client side, I get a "Socket closed." error.  My HTTP client is
> > not configured to use keepalive, which makes the error message seem
> > very strange.
> > The only 'weird' thing I am doing is sending a '100 Continue' response
> > from the back-end server.
> > Does nginx have different behavior when I send back a 100?
>
> Does the client do POST and pass "Expect: continue" ?
> nginx does not support "Expect: continue/100 Continue" dialog because
> current browsers still do not support it (at least I never see).
>
> So the client askes "Expect: continue", nginx passes the request
> to backend, the backend responses "100 Continue". nginx sends it
> to the client and goes to keep-alive state.
>
>

The client is not passing Expect: continue. I'm mimicking the behavior
of a 3rd-party app that 'unexpectedly' sends a 100 Continue response
before the 'real' response code. These are POST requests though, yes.

In the nginx access log, '100' is the status code shown. Does nginx
enable keep-alive automatically when that happens?