github.com/crewjam/saml@v0.4.14/samlsp/testdata/expected_authn_request.xml

<samlp:AuthnRequest xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol" ID="id-00020406080a0c0e10121416181a1c1e20222426" Version="2.0" IssueInstant="2015-12-01T01:57:09.123Z" Destination="https://idp.testshib.org/idp/profile/SAML2/Redirect/SSO" AssertionConsumerServiceURL="http://15661444.ngrok.io/saml2/acs" ProtocolBinding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST"><saml:Issuer Format="urn:oasis:names:tc:SAML:2.0:nameid-format:entity">https://15661444.ngrok.io/saml2/metadata</saml:Issuer><samlp:NameIDPolicy Format="urn:oasis:names:tc:SAML:2.0:nameid-format:transient" AllowCreate="true"/></samlp:AuthnRequest>