github.com/crewjam/saml@v0.4.14/samlsp/testdata/authn_request.url

https://idp.testshib.org/idp/profile/SAML2/Redirect/SSO?RelayState=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1cmkiOiIvIn0.eoUmy2fQduAz--6N82xIOmufY1ZZeRi5x--B7m1pNIY&SAMLRequest=lJJBj9MwEIX%2FSuR7Yzt10sZKIpWtkCotsGqB%2B5BMW4vELp4JsP8et4DYE5Tr%2BPnN957dbGY%2B%2Bz1%2BmZE4%2Bz6NnloxR28DkCPrYUKy3NvD5s2jLXJlLzFw6MMosg0RRnbBPwRP84TxgPGr6%2FHD%2FrEVZ%2BYLWSl1WVXaGJP7UwyfcxckwTQWEnoS2TbtdB6uHn9uuOGSczqgs%2FuUh3i6DmTaenQjyitGIfc4uIg9y8Phnch221a4YVFjpVflcqgM1sUajiWsYGk01KujKVRfJyHRjDtPDJ5bUShdLrReLNX7QtmysrrMK6Pqem3MeqFKq5TInn6lfeX84PypFSL7iJFuwKkN0TU303hPc%2FC7L5G9DnEC%2Frv8OkmxjjepRc%2BOn0X3r14nZBiAoZE%2FwbrmbfLZbZ%2FC6Prn%2F3zgcQzfHiICYys4zii6%2B4E5gieXsBv5kqBr5Msf1%2F0IAAD%2F%2Fw%3D%3D