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the "Location" xml attribute specifies the URL at which the IdP will post the user info after a successful login:

    <md:AssertionConsumerService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Location="https://[your hostname]/Shibboleth.sso/SAML2/POST" index="1"/>
  </md:SPSSODescriptor>
</md:EntityDescriptor>