Fix #4692, #4856 - stick with auto for scheme in db, change it to $scheme when rendering

backend/internal/nginx.js

@@ -216,6 +216,11 @@ const internalNginx = {
 				}
 			}
 
+			// For redirection hosts, if the scheme is not http or https, set it to $scheme
+			if (nice_host_type === "redirection_host" && ['http', 'https'].indexOf(host.forward_scheme.toLowerCase()) === -1) {
+				host.forward_scheme = "$scheme";
+			}
+
 			if (host.locations) {
 				//logger.info ('host.locations = ' + JSON.stringify(host.locations, null, 2));
 				origLocations = [].concat(host.locations);