Extra "Server" response header is appended when tornado worker processes receive SIGHUP

[bobunderson]

When tornado worker processes receive SIGHUP, extra "Server" response header is appended.
For example:

   (start process)
   $ curl -D - http://127.0.0.1:8080/foo
   HTTP/1.1 200 OK
   ...
   Server: TornadoServer/4.2 (Gunicorn/19.4.5)
   ...

   (send SIGHUP to gunicorn master process)
   $ curl -D - http://127.0.0.1:8080/foo
   HTTP/1.1 200 OK
   ...
   Server: TornadoServer/4.2 (Gunicorn/19.4.5) (Gunicorn/19.4.5)
   ...

[benoitc]

How do you launch the server?