Is it possible to access post or get parameters via the HttpActionContext object?
I have a set of sensors that loggs data to a web server that provides a REST api.
You should be able to get this information from actionContext.Request That is the way to get to the request data.
actionContext.Request
The posted data is in actionContext.Request.Content Or if it's a GET request you could get the querystring from actionContext.Request.RequestUri
actionContext.Request.Content
actionContext.Request.RequestUri