= Hostname SPI The hostname SPI introduces a more flexible way to configure the hostname for {project_name}. There is two built-in providers. The first is request, which uses the request headers to determine the hostname. The second is fixed, which allows configuring a fixed hostname. The latter makes sure that only valid hostnames can be used and also allows internal applications to invoke {project_name} through an alternative URL. For more details refer to the threat mitigation section in the link:{adminguide_link}[{adminguide_name}].