What are HTTP status codes? What are the common HTTP status codes?

⭐ Column introduction

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⭐ What are HTTP status codes?

The HTTP status code is a three-digit code returned by the server in response to an HTTP request. This code represents the processing result of the request and is usually used to instruct the client how to handle the request it makes. HTTP status codes consist of three digits divided into five different categories, each with a different meaning.

Here are some common HTTP status codes and their meanings:

⭐ 1xx - Informational status code

  1. 100 Continue : Indicates that the server has received the initial part of the request and is waiting for the client to send the rest. Usually used when the client needs to send large data.

  2. 101 Switching Protocols : Indicates that the server has understood the client's request and will notify the client of switching protocols through the Upgrade message header.

⭐ 2xx - success status code

  1. 200 OK : Indicates that the server successfully processed the request and returned the requested data.

  2. 201 Created : Indicates that the request was successful and the server has created a new resource, usually returned after a POST request.

  3. 204 No Content : Indicates that the request was successfully processed, but the server does not need to return any response body. Usually returned after a DELETE request.

⭐ 3xx - redirect status code

  1. 301 Moved Permanently : Indicates that the requested resource has been permanently moved to a new URL.

  2. 302 Found (Temporary Redirect) : Indicates that the requested resource has been temporarily moved to a new URL. It is an HTTP/1.0 specification, but is often used to implement temporary redirects.

  3. 304 Not Modified : Indicates that the client's cached copy is still valid and can be used directly without obtaining new data from the server.

⭐ 4xx - Client error status code

  1. 400 Bad Request : Indicates that the server cannot understand the client's request, usually because the request syntax is incorrect.

  2. 401 Unauthorized : Indicates that the request requires user authentication. The client usually needs to provide a valid username and password.

  3. 403 Forbidden : Indicates that the server understands the request but refuses to execute it, usually due to permission issues.

  4. 404 Not Found : Indicates that the requested resource was not found on the server.

⭐ 5xx - Server error status code

  1. 500 Internal Server Error : Indicates that the server encountered an unexpected error and was unable to complete the request.

  2. 502 Bad Gateway : Indicates that the server, acting as a gateway or proxy, received an invalid response from the upstream server.

  3. 503 Service Unavailable : Indicates that the server is currently unable to handle the request, usually due to maintenance or overload.

These are some common examples of HTTP status codes, each status code has a specific meaning and helps the client understand the outcome of the request. In actual development, developers can debug and handle HTTP requests based on status codes.

⭐Write at the end

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