[batuhanicoz]

People on that thread also noticed more keywords and think it might be Akamai WAF. I don't know enough about it be sure.

You can't have some strings in the URL for the main NSA.gov domain as well. So https://nsa.gov/fakething?hey=traceroute will give you the same error.

[ehsankia]

Yeah it's clear that a system is just blindly grepping the request url for certain keywords and killing the query.