Let's send a GET request to http://localhost:8080/non-existing-resource using a header (Content-Type:application/json).

The following screenshot shows the response when we execute the request:

The response is as shown in the following code snippet:

    {
      "timestamp": 1484027734491,
      "status": 404,
      "error": "Not Found",
      "message": "No message available",
      "path": "/non-existing-resource"
    }

Some important things to note are as follows:

• The response header has an HTTP status of 404 - Resource Not Found
• Spring Boot returns a valid JSON ;message as a ;response with the ;message stating that the resource is not found