code: public final HttpServer handle(BiFunction<? super HttpServerRequest, ? super
  			HttpServerResponse, ? extends Publisher<Void>> handler) {
  		return new HttpServerHandle(this, handler);
  	}
docs: Attach an I/O handler to react on a connected client
  
  @param handler an I/O handler that can dispose underlying connection when {@link
  Publisher} terminates. Only the first registered handler will subscribe to the
  returned {@link Publisher} while other will immediately cancel given a same
  {@link Connection}
  
  @return a new {@link HttpServer}