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Leveraging the IdP-initiated SSO feature of the Shibboleth IdP, an HTTP client will authenticate to the IdP via HTTP Basic Authentication and push a signed SAML2 Response to a SAML2 HTTP-POST endpoint at the SP. The client code will be a fork of the dead entity scripts, a set of bash scripts that probe endpoints in InCommon metadata. (Some sample code is provided so you can see where we're headed.)
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