Reference
HTTP_ERROR
The request could not be served
The request could not be served
HTTP status 400 Bad Request, code HTTP_ERROR.
What it means#
The HTTP layer itself rejected the request before any operation ran: an unsupported method, a malformed request line or a similar protocol-level problem. The status is whatever the HTTP layer chose, most often 400 or 405.
What to do#
Treat it as a client bug. Check the method and the URL and the way the request is being constructed; it is not a condition that clears on retry.
On the wire#
Every error response carrying this code names this page in error.moreInfo,
with the request id in the query string. See Error codes for
the response shape and the list of every code.