unable to catch an error originating from a request

trying to test out failure logic, i keep encountering
error: Uncaught (in promise) TypeError: error reading a body from connectionerror: Uncaught (in promise) TypeError: error reading a body from connection

with no further details. tried to look it up online with no success; i have .on("error", ...).on("error", ...) handlers setup everywhere where an error may occur.