Velocity has 3 headless mode:
- application = one headless for all requests,
- pool = a pool of headless answering requests,
- session = one headless per HTTP session.
And this per solution.
Now, to run asynchronously from Servoy, the problem would not be too much on the Velocity side, but that you would probably use the http plugin to send a call to your web service, whether a get or a post or put request, in any case, the call to executeRequest() would be a blocking one. So I’m afraid it will not fit your bill.