hostname only from entityID URL

[Peter Schober]

* Szerb, Tamas <toma at rulez.org> [2015-10-12 19:59]:
> I wonder, where would sit the URL in the metadata officially, because eg
> the Organization/OrganizationURL is not fully implemented by the saml sps,
> so it would be logical to store that info in entityid.

I don't understand what you're asking. What is "the URL" in your
question? If the question is "How do I get at the entityID from the
requesting SAML SP" then the tautologically answer is: yes, you store
the entityID info in the entityID.
I already pointed to you how to get at the entityID itself.

> but i have seen implementations that prohibit the entityid to be
> url, but has no such url for sp in sp metadata.

Since the entityID is of type "anyURI" in the schema an implementation
that didn't allow URLs there would have to be very badly broken
indeed. (So bad it wouldn't be able to interop with 99.99% of the SAML
entities I've seen.)
-peter