How to use http status code

When using HTTP status codes, you usually need to pay attention to three points: "The client needs to check the status code", "The server needs to set the status code correctly" and "The status code has semantic meaning": 1. The client needs to check the server The returned status code is used to determine whether the request is successful and how to process the response data returned by the server; 2. The server needs to set the corresponding status code according to the processing result of the request and return the status code to the client as part of the response header; 3. , Developers need to understand the meaning of each status code in order to better understand the processing results of the request.

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

HTTP status code is used to indicate the processing result of the request. Developers can use the status code to understand the server's processing result of the request and take corresponding processing measures.

When using HTTP status codes, you usually need to pay attention to the following points:

1. The client needs to check the status code: The client needs to check the status code returned by the server to Determine whether the request was successful and what to do with the response data returned by the server.

2. The server needs to set the status code correctly: The server needs to set the corresponding status code according to the processing result of the request, and return the status code to the client as part of the response header.

3. Status code has semantic meaning: HTTP status code is not just a number, it also has certain semantic meaning. Therefore, developers need to understand the meaning of each status code in order to better understand the processing results of the request.

The following are some common HTTP status codes and their recommended handling methods:

• 200 OK: Indicates that the request is successful and the response returned by the server The body contains the requested resource. The client should perform subsequent processing based on the data returned by the server.

• 400 Bad Request: Indicates that the request sent by the client has an error or cannot be completed. The client needs to check the format and missingness of request parameters to ensure that the request is correct.

• 401 Unauthorized: Indicates that the client request requires authentication, but no valid credentials were provided. The client needs to provide correct authentication information in order to obtain the requested resource.

• 403 Forbidden: Indicates that the client request was rejected by the server, usually because the client does not have permission to access the specific resource. The client needs to contact the server administrator to obtain the appropriate permissions to access the required resources.

• 404 Not Found: Indicates that the resource requested by the client does not exist on the server. The client needs to confirm whether the resource's URL is correct or whether it has been removed from the server.

• 500 Internal Server Error: Indicates that the server encountered an unexpected situation and was unable to complete the request. Server administrators need to check the server logs to determine the root cause of the problem and take appropriate actions to resolve the issue.

• 503 Service Unavailable: Indicates that the server is temporarily unable to process the request, usually due to overload or maintenance. The client can retry the request, or try again later.

In short, understanding the HTTP status code can help developers better understand the processing results of the request and take corresponding processing measures.

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