What methods can be used to handle and complete a request on the frontend with a 201 status when an orderNotFound error occurs in Spring?

If a 201 (Created) status is received from the frontend request but the response body contains an orderNotFound error, it can be handled as follows:

1. Check the response body: Despite the 201 status, analyze the response content for errors.
2. Handle the error on the frontend: For example, if the API returns a JSON with an error field, display an appropriate message to the user.
3. Complete the request: After handling the error, properly conclude the request, such as updating the UI state or redirecting the user.

Example in JavaScript using fetch:

fetch('/api/orders', { method: 'POST', body: JSON.stringify(orderData) })
  .then(response => response.json().then(data => ({ status: response.status, body: data })))
  .then(({ status, body }) => {
    if (status === 201 && body.error === 'orderNotFound') {
      // Handle error
      alert('Order not found');
      // Additional actions, e.g., reset form
    } else if (status === 201) {
      // Successful order creation
      console.log('Order created', body);
    } else {
      // Handle other statuses
    }
  })
  .catch(error => {
    console.error('Request error:', error);
  });

Thus, even with a 201 status, you can correctly handle errors if they are present in the response body.