DISPATCH-941: Router is returning incorrect files from http get

Bug in http-libwebsockets code. A partial HTTP handler such as we have needs to
call lws_callback_http_dummy() to fill in default HTTP behaviours. Without that
the LWS library was not properly informed of termination of HTTP transactions
causing confusion if a connection was re-used.

(cherry picked from commit c728d7f41c78ccc8db127b87c11470a5b9bc8c82)
1 file changed