Question

Spring Web 3.2 comes with a DeferredResult class for asynchronous request processing. It has a setErrorResult for providing an alternative response if something goes wrong, but no option to supply a http error code.

Surely it must be possible to control the http response code for failed requests.. How do I do that using the new Spring api?

Answer 1

The doc for setErrorResult method says the following:

Set an error value for the DeferredResult and handle it. The value may
be an Exception or Throwable in which case it will be processed as if
a handler raised the exception.

I suppose by setting an Exception, you may trigger an exception handler that returns the code you desire.