Spring: ResponseEntity gives you full control of the response

@PostMapping("/orders")
ResponseEntity<Order> create(@RequestBody OrderRequest req) {
    Order saved = service.create(req);
    return ResponseEntity
            .created(URI.create("/orders/" + saved.id()))
            .header("X-Request-Id", MDC.get("requestId"))
            .body(saved);
}

HTTP/1.1 201 Created
Location: /orders/42
X-Request-Id: 8f2c...
{"id":42,...}