Customer needs a possibility to determine the Product to log into based on the Host HTTP Header. This was not possible for clients using the USM, because the Host header is always localhost.

Therefore, USM passes the Host header as received from the client, in a custom X-Host header to the OX server. A new property has been introduced which enables/disables this functionality in usm.properties:

com.openexchange.usm.pass_client_host_header=true

The default value for this property is true.