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The other is to use debugging tools such as Postman to send a request for a non-existent url or when an exception occurs in server processing, Spring Boot will return Json format string information similar to the following

{"timestamp": "2018-05-12T06:11:45.209+0000", "status": 404, "error": "Not Found", "message": "No message available", "path": "/ index.html"}

The principle is also simple: Spring Boot provides the result mapping path / error for program errors by default. This / error request is processed in the BasicErrorController, which determines whether the content of the Accept in the request header is text/html to distinguish whether the request comes from the client browser (the browser usually automatically sends the request header content Accept:text/html by default) or the call from the client interface, so as to decide whether to return the page view or the JSON message content.

The code in the relevant BasicErrorController is as follows:

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