HTTPstatuskoodit

HTTP status codes are standardized codes used in the Hypertext Transfer Protocol (HTTP) to indicate the result of a client's request to a server. They are part of the HTTP response message and are divided into five classes, each with a specific range of codes. The first digit of the status code defines the class of response, while the last two digits do not have any classifying or categorization role. The five classes are:

1. Informational responses (100–199): These codes indicate that the request has been received and understood, and the process is continuing.

2. Successful responses (200–299): These codes indicate that the request was successfully received, understood, and accepted.

3. Redirection messages (300–399): These codes indicate that further action needs to be taken by the user agent in order to fulfill the request.

4. Client error responses (400–499): These codes indicate that the request contains bad syntax or cannot be fulfilled.

5. Server error responses (500–599): These codes indicate that the server failed to fulfill an apparently valid request.

Some commonly used HTTP status codes include:

- 200 OK: The request has succeeded.

- 301 Moved Permanently: The requested resource has been assigned a new permanent URI.

- 404 Not Found: The server cannot find the requested resource.

- 500 Internal Server Error: The server has encountered a situation it doesn't know how to handle.

HTTP status codes are essential for web development and debugging, as they provide a standardized way to communicate the outcome of a request. They help developers understand and troubleshoot issues, and they are used by web browsers and other user agents to determine how to handle a response.