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This article mainly introduces "what are the rescue methods for invalid HTTP 400 error requests in web". In daily operation, I believe that many people have doubts about the invalid rescue methods of HTTP 400 error requests in web. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to you to answer the doubts of "what are the invalid rescue methods of HTTP 400 error requests in web?" Next, please follow the editor to study!

The HTTP400BadRequest response status code indicates that the server cannot understand the request because the syntax is invalid. The client should not repeat this request without modification. The invalid error message of this request indicates that the request has not entered the backend service.

Possible reasons for incorrect http400 requests:

First of all, determine whether the request interface connection is correct.

The field name or field type of the data submitted by the front end is not consistent with the entity class in the background.

The data submitted by the front end to the background should be of the json string type, while the front end does not convert the object to the string type.

Wrong request solution for http400:

For front-end and background interaction, it is best to have documentation and interface documentation to minimize low-level errors (after getting the background interface, use postman to run the interface and communicate with the background in time instead of waiting until you encounter problems after working on the project.)

When a user attempts to access content on a running host through the HTTP or FTP protocol, the Web server returns a numeric code indicating the status of the request.

The status code is recorded in the server log and may also be displayed in a Web browser or FTP client. That is, the error message code that the browser displays when we open the page. The status code can indicate whether a specific request was successful or not, and it can also reveal the exact reason why the request failed.

HTTP400 series error list:

1 、 401Unauthorized

The current request requires user authentication. The response must contain a WWW-Authenticate header for the requested resource to ask for user information. The client can repeatedly submit a request containing the appropriate Authorization header information. If the current request already contains Authorization certificates, the 401 response means that the server verifies that those certificates have been rejected.

If the 401 response contains the same authentication challenge as the previous response, and the browser has attempted authentication at least once, the browser should show the user the entity information contained in the response. because this entity information may contain relevant diagnostic information. See RFC2617.

2 、 402PaymentRequired

The status code is reserved for possible future requirements.

3 、 403Forbidden

The server has understood the request but refused to execute it. Unlike the 401 response, authentication does not provide any help, and the request should not be submitted repeatedly. If this is not an HEAD request and the server wants to be able to explain why the request cannot be executed, the reason for the rejection should be described within the entity. Of course, the server can also return a 404 response if it does not want the client to get any information.

4 、 404NotFound

The request failed and the desired resource was not found on the server. There is no information to tell the user whether the situation is temporary or permanent. If the server knows, the 410 status code should be used to inform the old resource that it is permanently unavailable due to some internal configuration mechanism problem, and there is no address to jump to.

At this point, the study on "what are the rescue methods for invalid HTTP 400 error requests in web" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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