Two important terms:
- An *option* is a protocol-specific setting, e.g. "method" (get, post, put...) if you are using HTTP or "callback function to be called when inserting a document" in MongoDB.
- A *parameter* is a settings that's common to all protocols. As of 2015 only one parameter got implemented ("notification").
While these words might look vague they are used coherently throughout the stream feature, documentation included.