accepting incoming requests.
 Conversely, the <code>stop</code> method can be used to stop
 accepting incoming requests and take the endpoint down.
 Once stopped, an endpoint cannot be published again.

 <p>An <code>Executor</code> may be set on the endpoint in order
 to gain better control over the threads used to dispatch incoming
 requests. For instance, thread pooling with certain parameters
 can be enabled by creating a <code>ThreadPoolExecutor</code> and
 registering it with the endpoint.

 <p>Handler