How to set http status code

http status code setting method: 1. In Java, you can use the method provided by the Servlet API to set the status code; 2. In Python, you can use the method provided by the corresponding Web framework to set the status code; 3. In Node.js, you can use the method provided by the Express framework to set the status code; 4. In PHP, you can use the header function to set the status code.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

In the HTTP protocol, status codes are used to indicate the server's processing results of client requests. By setting appropriate status codes, the results of request processing and related information can be communicated to the client. The following are some common knowledge points about how to set HTTP status codes:

1. Classification of status codes:

HTTP status codes are divided into five categories, namely 1xx (Informational status code), 2xx (Success status code), 3xx (Redirect status code), 4xx (Client error status code) and 5xx (Server error status code). Each status code has a specific meaning and is used to represent different request processing results.

2. How to set the status code:

On the server side, you can set the HTTP status code programmatically. The exact method depends on the programming language and server framework used. The following are some common ways to set status codes:

In Java, you can use Servlet The API provides methods to set the status code. For example, you can use response.setStatus(200) in a Servlet to set the status code to 200.

In Python, you can use the methods provided by the corresponding web framework to set the status code. For example, in the Django framework, the status code can be set using the status_code attribute of the HttpResponse object.

In Node.js, you can use the methods provided by the Express framework to set the status code. For example, in Express you can use res.status(200) to set the status code to 200.

In PHP, you can use the header function to set the status code. For example, you can use header('HTTP/1.1 200 OK') to set the status code to 200.

3. Common status codes and their meanings:

The following lists some common HTTP status codes and their meanings, used to represent different request processing results:

200 OK: Indicates that the request has been successfully processed.

201 Created: Indicates that the request was successfully processed and a new resource was created on the server.

204 No Content: Indicates that the request was successfully processed, but there is no body part of the entity in the response.

301 Moved Permanently: Indicates that the requested resource has been permanently moved to a new URL.

400 Bad Request: Indicates that the server cannot understand the client's request, usually because the data format sent by the client is incorrect.

401 Unauthorized: Indicates that the request requires authentication.

403 Forbidden: Indicates that the server refuses to execute the request, usually due to insufficient permissions.

404 Not Found: Indicates that the requested resource does not exist.

500 Internal Server Error: Indicates that an error occurred when the server processed the request.

When setting the status code, you need to select the appropriate status code based on the specific request processing results and provide the corresponding information in the response.

4. Other status code-related information:

In addition to the status code itself, other status code-related information can also be provided in the response to help The client understands the results of request processing. Common status code-related information includes response headers (Response Headers) and response body (Response Body).

Response header: Various response header fields can be set in the response to convey information related to the status code. For example, you can use the Content-Type field to specify the data type of the response, the Location field to specify the redirected URL, etc.

Response body: You can include some text information or data related to the status code in the response. For example, you can include error information, prompt information, etc. in the response body.

It should be noted that setting the HTTP status code is the responsibility of the server, and the client can only read and parse the status code. When setting the status code, you need to select an appropriate status code based on specific business requirements and HTTP protocol specifications, and provide corresponding information so that the client can correctly understand the results of request processing.

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