What does http protocol status code 4xx mean?

The 4xx status code in the HTTP protocol indicates a client error, indicating that the request issued by the client has an error or cannot be completed. The status code can help developers determine the problem with the client request and take appropriate processing. measure. For example, the correctness of the request parameters can be checked based on the 400 status code, the resource cannot be found based on the 404 status code, and so on.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

4xx status codes in the HTTP protocol indicate client errors. This type of status code indicates that the request issued by the client has an error or cannot be completed.

The following are some common 4xx status codes and their meanings:

• 400 Bad Request: The server cannot understand the client's request, usually due to malformed request parameters or Missing.
• 401 Unauthorized: The client request required authentication, but no valid credentials were provided.
• 403 Forbidden: The client request was rejected by the server, usually because the client does not have permission to access the specific resource.
• 404 Not Found: The resource requested by the client does not exist on the server.
• 405 Method Not Allowed: The client used an HTTP method that is not supported by the server.
• 408 Request Timeout: The request sent by the client did not receive a response within the server waiting time.
• 429 Too Many Requests: The client sent too many requests, exceeding the server's limit.

These status codes can help developers determine the problem with the client request and take corresponding measures. For example, the correctness of request parameters can be checked based on the 400 status code, the resource not found situation can be handled based on the 404 status code, and so on.

The above is the detailed content of What does http protocol status code 4xx mean?. For more information, please follow other related articles on the PHP Chinese website!