Enable External Authentication Flow

[Peter Schober]

* José Ramalho <jramalho at ua.pt> [2016-05-03 16:30]:
> What i thought it would happen was if  add External to idp.authn.flows in
> idp.properties, another link would be added to the login form.
> 
> Instead, the user is automatically redirected to the external URL.

Guessing what the IDP should do based on the name of a parameter will
not get you far. Instead, read the documentation.

In this case:
https://wiki.shibboleth.net/confluence/display/IDP30/ExternalAuthnConfiguration

Linked from
https://wiki.shibboleth.net/confluence/display/IDP30/AuthenticationConfiguration
which in turn is referenced from
https://wiki.shibboleth.net/confluence/display/IDP30/Configuration

Best reagrds,
-peter