Clarify code_challenge_method
RFC requirement
#4464
Merged
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Reasoning 💡
RFC7636 specifies that clients MUST use the S256 method for code exchange, if able. This clarifies it in the docs, instead of just saying it's "not recommended" or "it's usually only for backwards compatibility".
Checklist 🧢
TestsAffected issues 🎟
#4459 is related by this comment.