To retrieve complete information about a reply to a topic in a stand-alone forum, use the edit link found in the forum reply entry in the forum replies feed.
You can use this operation to obtain forum reply information that you want to preserve prior to performing an update. See Updating forum replies for more information. This method returns the Atom entry of a single reply entry as opposed to a feed of all the reply entries.
See Authenticating requests for information about how to authenticate the request.