If the action returns an HttpResponseMessage, Web API converts the return value directly into an HTTP response message, using the properties of the HttpResponseMessage object to populate the response. This option gives you a lot of control over the response message. For example, the following controller action sets the Cache-Control header.
The Macchiato Defined. The macchiato (mah-key-AH-toe) is a cornerstone of Italian coffee culture, along with the espresso and cappuccino, among other coffee drinks. It's basically an espresso (served in a demitasse cup) with a small amount of foamed milk on top -- the name macchiato means marked.
In a latte macchiato, espresso is added to milk, rather than the reverse, and caffÃ¨ lattes have a stronger coffee flavour. The latte macchiato is milk steamed to microfoam, served in a glass with a half shot of espresso poured