The goal is to ignore whatever the client sets for these headers, and
to pass our defined values on to the upstream cluster.
It appears that these values only get set if the client leaves them
out of the request. If the client sets X_SSL_VERIFIED to true, the
backend application sees 'true'.
I wanted to clarify that this is the expected behavior and that
proxy_set_header cannot be used to override the request header values
that a client sets. If this is the case, is there any way to