Checks group membership according to an Apache htgroup file. Apache is a popular HTTP server, and supports flat group files for authenticating web access. With <AuthBy HTGROUP> Radiator can authenticate users against the same files that Apache uses, in order to provide a single source of authentication information for both Apache and Radiator.

In order to use <AuthBy HTGROUP>, the user record must specify an AuthBy check item naming the Identifier of the AuthBy HTGROUP to be used. See the example in goodies/htgroup.cfg for details. During authentication, the user's GroupList check items will be used to check for group membership against the Apache group file specified by the GroupFilename parameter.