As I cannot see any reference on how to use properly the sysparm_query_category, may I confirm on how did you append the sysparm_query_category in get request?
webfocus
flash-cs3
receipt-validation
geocoder
android-touch-event
chronoforms
tianshou
apache-james
payload
string.h
jenetics
cfml
cloud-object-storage
filenet
gets
postfix-operator
isometric
file-comparison
vmware-workstation
tableadapter
node-repl
amazon-elb
bitbucket-api
sphinx-napoleon
new-operator
node-mysql
onclick
kaitai-struct
in-memory-cache
basil.js