How to get EntityID of SP with ExternalAuthnConfiguration

[Noriyuki TAKEI]

Is there any way to get the EntityID of the SP to be authenticated in the
Servlet that is first accessed when the ExternalAuthnConfiguration flow
starts?

For example, the following is the Servlet class, and I would like to obtain
the EntityID of the SP to be authenticated in the following service method.

public class ExternalAuthnFlowServlet extends HttpServlet {

    @Override
protected void service(final HttpServletRequest req, final
HttpServletResponse resp) throws ServletException {
        // get EntityID of SP.
        // here is the process to get EntityID of SP.

   }

Shibboleth IdP version is 5.0.0
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