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.
As with a caffÃ¨ macchiato, which is espresso with a spot of milk atop, indicating there's a hint of milk underneath the espresso foam, a latte macchiato is the opposite, to indicate there is espresso in the milk. The use of the term 'macchiato' has been widened to include a huge array of beverages and ice creams.