Turn Off or switch from Streaming to regular HTML

Hi I followed the instruction per below:

http://wiki.apache.org/tapestry/Tapestry5HowToCreateADynamicPDF

However, 1) I would like HTML version to be rendering (in parallel with streaming)
         2) subsequent reloads should render HTML, not stream unless requested.

Basically, how would the streaming aspect be threaded separately and controlled?