In certain situations (for example, when the service or its consumers are behind an overzealous corporate firewall, or if the main consumer is a web page), only the GET and POST HTTP methods might be available. In such a case, it is possible to emulate the missing verbs by passing a custom header in the requests.

For example, resource updates can be handled using POST requests by setting a custom header (for example, X-HTTP-Method-Override) to PUT to indicate we are emulating a PUT request via a POST request. The following method will handle this scenario:

@RequestMapping(value = "/{roomId}", method = RequestMethod.POST, headers = {"X-HTTP-Method-Override=PUT"})
public ApiResponse updateRoomAsPost(@PathVariable("roomId") long id, @RequestBody RoomDTO updatedRoom) {
  return updateRoom(id, updatedRoom);
}

By setting the headers attribute on the mapping annotation, Spring request routing will intercept POST requests with our custom header and invoke this method. Normal...