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What are HTTP status codes?

Started by grofee, February 02, 2023, 05:47:08 PM



grofee


Akshay_M

HTTP status codes are standardized three-digit numbers that are returned by a web server in response to a client's request made to a website or web application. These codes provide information about the status of the request and the outcome of the server's attempt to fulfill it. HTTP status codes are an essential part of the Hypertext Transfer Protocol (HTTP) used for communication on the World Wide Web. They help both clients (typically web browsers) and servers understand and handle web requests and responses effectively. HTTP status codes are divided into several classes, each with its own specific meaning:

Informational Responses (1xx):

These status codes indicate that the request was received and understood, and the server is continuing to process it. They are rarely used in practice.
Successful Responses (2xx):

These status codes indicate that the request was successfully received, understood, and processed by the server. Common status codes in this class include:
200 OK: The request was successful, and the server is returning the requested data.
201 Created: The request has resulted in the creation of a new resource.
204 No Content: The server successfully processed the request, but there is no content to return.
Redirection Messages (3xx):

These status codes indicate that the client must take additional action to complete the request. Common status codes in this class include:
301 Moved Permanently: The requested resource has been permanently moved to a new URL.
302 Found (or 303 See Other): The requested resource is temporarily located at a different URL.
304 Not Modified: The client's cached version of the resource is still valid, so there is no need to download it again.
Client Error Responses (4xx):

These status codes indicate that there was an error on the client's part, such as a malformed request or unauthorized access. Common status codes in this class include:
400 Bad Request: The server could not understand the client's request.
401 Unauthorized: Authentication is required to access the requested resource.
403 Forbidden: The client does not have permission to access the requested resource.
404 Not Found: The requested resource could not be found on the server.
Server Error Responses (5xx):

These status codes indicate that there was an error on the server's part when attempting to fulfill the client's request. Common status codes in this class include:
500 Internal Server Error: An unexpected error occurred on the server.
502 Bad Gateway: The server, acting as a gateway, received an invalid response from an upstream server.
503 Service Unavailable: The server is temporarily unable to handle the request due to overload or maintenance.
HTTP status codes play a critical role in web communication, as they provide information about the success or failure of a request and guide both clients and servers in handling various situations. They are a fundamental part of troubleshooting web-related issues and ensuring a smooth user experience on the web.