API search calls no longer work since "Roku Search feed 2.0" update

The "search" API call on my Roku Premiere no longer works after one of the recent updates (Oct. 5th I think).  The curl command (as laid out in the the External Control Protocol docs) sends me to the old search page which no longer returns any shows, movies, etc.  The new search feed only works when I access it directly through the Roku GUI.

Does anyone know how to access the new search feed through the API?