[ic] HTTP Connection header

[Grant]

I'm supposed to set the following when enabling keepalive connections
between nginx and apache2 in a reverse proxy config:

proxy_set_header Connection "";

This prevents "close" from passing through from the client and
disabling keepalive on this backend connection.  However when I set
this directive I only get a blank screen back from an IC request.  I
also use Odoo in a reverse proxy config behind nginx and the above
directive works fine.

Does anyone know why this happens with IC?

- Grant