'Base handler for OPTIONS requests
:param req: swob.Request object
:returns: swob.Response object'

@public
@timing_stats()
def OPTIONS(self, req):

    headers = {'Allow': ',    '.join(self.allowed_methods), 'Server': ('%s/%s' % (self.server_type, swift_version))}
    resp = Response(status=200, request=req, headers=headers)
    return resp
