Gunicorn python Klein

Question

Use Klein for the server and want to run it via Gunicorn.

from klein import Klein
app = Klein()

@app.route('/')
def hello(request):
    return "Hello, world!"

resource = app.resource

Working good in twistd -n web --class=twistdPlugin.resource but need add threads, how to do it?

Or how to start this with Gunicorn, now it's return me Application object must be callable.