Horizon needs to know that the traffic is being redirected from HTTPS. Usually this is done using headers:
X-FORWARDED-PROTO: https or HTTP_X_FORWARDED_PROTO: https
Make sure the proxy sends some of these to Horizon.
Horizon needs to know that the traffic is being redirected from HTTPS. Usually this is done using headers:
X-FORWARDED-PROTO: https FORWARDED_ PROTO: https
or
HTTP_X_
Make sure the proxy sends some of these to Horizon.