Add url parameters to suppress text and didyoumean

At this point these are primarily for load testing but I imagine they'll be
a useful place to start for things like turning off either one when the
api doesn't need it.

Change-Id: Ic0802b77be575a98c439bb842775e67489668490
(cherry picked from commit 67204bf5830d81b1d1fdddbe30494730f826c192)