[Auth_Prompt] alters the current HTTP response header with either a Basic or Digest authentication request. [Auth_Prompt] is used internally by the [Auth], [Auth_Admin], [Auth_Group], [Auth_User], and [Auth_Custom] tags.

The type of authentication can be selected using -Basic=True/False and -Digest=True/False. By default the authentication method selected in Site Administration is used. The realm for either type of authentication can be set using -Realm (defaults to Lasso Security).

Digest authentication has additional parameters: -Nonce which specifies a one-time value that is passed to the browser and back in the authentication response (defaults to [Lasso_UniqueID]). -Stale allows the digest authentication to be made stale so the browser re-prompts for authentication.

By default the [Auth_Prompt] tag issues an [Abort] after it constructs the new HTTP response header. The -NoAbort keyword instructs the tag not to [Abort] so tags that come after it can run.

By default the [Auth_Prompt] tag replaces the current HTML response with a simple HTML page saying that authentication has been requests. Most browsers do not display this HTML. The -ErrorResponse parameter allows the built-in response to over-ridden with any HTML.