In HTTP, which status code indicates that a request was successful?

The status code that indicates a successful request in HTTP is 200. When a server returns this status code, it signifies that the request has been received, understood, and processed successfully. It is one of the most common responses in web communications, indicating that the client's request (such as for web pages or data) has been completed as expected.

In contrast, other codes serve different purposes. For example, 404 indicates that the requested resource could not be found, while 500 denotes an internal server error, suggesting that something went wrong on the server side while processing the request. The code 301 is used for permanent redirection, informing the client that the requested resource has been moved to a new URL. Thus, 200 is explicitly tied to a successful request, making it the most essential status code for confirming the completion of a request.