Upstream with multiple request reply

[Bertrand Paquet]

Hi,

Arg, it's not a good news :)

Do you think I can do ngx_http_subrequest to do some additional request to
back end ?
How to say to nginx to wait for subrequest before calling create_request ?

Regards,

Bertrand


On Mon, Jan 16, 2012 at 22:20, Maxim Dounin <mdounin at mdounin.ru> wrote:

> Hello!
>
> On Mon, Jan 16, 2012 at 09:40:26PM +0100, Bertrand Paquet wrote:
>
> > Hi all,
> >
> > I'm trying to write an upstream which have to do multiple request / reply
> > with backend, for one frontend request.
> >
> > Currently,
> > - I'm writing first request to backend in create_request handler, write
> > data into r->upstream->request_bufs, and returning NGX_OK
> > - Nginx call me on process_header. I can read data from
> > r->upstream->buffer. I can loop on process_header if I return NGX_AGAIN.
> > But I'm not able to send more data to backend. I try to add buffer in
> > r->upstream->request_bufs, in r->upstream->request_bufs->next, nothing
> work.
> >
> > Anybody know how to send data to backend in the process_header callback ?
>
> The upstream module is designed to handle "single request - single
> response" model, it's not capable of sending multiple requests to
> backend.
>
> Maxim Dounin
>
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