1. HttpResponseMessage: This class allows developers to create and return HTTP responses with a customized status code, headers, and content.
2. IHttpActionResult: This interface provides a level of abstraction between the controller and the HTTP response, allowing developers to return a variety of response types that implement the interface.
3. JsonResult: This class is used to serialize an object to JSON format and return it as an HTTP response message.
XmlResult: This class is used to serialize an object to XML format and return it as an HTTP response message.
FileStreamResult: This class is used to return a file as an HTTP response message by reading the file as a stream.
EmptyResult: This class is used to return an empty HTTP response message with a specified status code.
StatusCodeResult: This class is used to return an HTTP response message with a specified status code and no content.
RedirectResult: This class is used to redirect the client to a different URL by returning an HTTP response message with a redirect status code.
