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How can we bypass the login when hitting the saml web app addons to generate a saml response

My use case is, a user logged in the application and want to send the saml response to some external IDP, so when I initiated the saml call (https://{auth.domain}/samlp/{clientId}), is redirected to the login page but the user is already logged in the application. so how can I bypass the login and generate the saml response directly