Using a discovery service for a specific URL?

[Wessel, Keith]

Hi, all,

One of our SP admins wants to use our tri-campus discovery service for a virtualhost on his SP. His shibboleth2.xml is configured with our IDP's entityID and no discoveryURL for the server-wide defaults. I'd like to help him override these using Apache mod_shib settings instead of a shibboleth2.xml applicationOverride. But I can't find a way to set the entityID to blank in Apache. Thus, the system-wide entityID is always taking precedence over the discoveryURL set in the .htaccess file. I realize I could have him set a system-wide blank IDP entityID parameter and explicitly set it for each virtualHost. But is there a simpler way to do this?

The lines we're adding to .htaccess are:
ShibRequestSetting entityID "" (throws an error because of the "" 3rd parameter, so I've commented it out)
ShibRequestSetting discoveryURL https://discovery.url.goes.here

What's the best way to accomplish this?

Thanks,
Keith