Upstream: fixed handling of write event after sending request.
Upstream: fixed handling of write event after sending request.

The ngx_http_upstream_dummy_handler() must be set regardless of
the read event state.  This prevents possible additional call of
ngx_http_upstream_send_request_handler().

firebase/nginx,hy0kl/nginx,firebase/nginx,firebase/nginx,hy0kl/nginx,hy0kl/nginx,firebase/nginx