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by rb12345 697 days ago
That's true for SAML2, but not SAML1 - not that anything should be using SAML1 these days.
1 comments

Well that depends on the binding right? In case you use the "artifact binding" then theres also direct communication between SP and IdP. I havent seen it in the wild and I am also no professional, but I saw it in the 2.0 standard, e.g., see https://docs.oasis-open.org/security/saml/Post2.0/sstc-saml-...
It’s hard enough to debug SAML as it is, I can’t imagine debugging artifact binding without having full control of both the SP and IdP.