Github user mike-tr-adamson commented on the pull request:
https://github.com/apache/incubator-tinkerpop/pull/291#issuecomment-211403744
@PommeVerte I'm not sure what prepending it or adding it makes any
difference to the negotiation. I prepended it so it was (potentially) the first
element in the payload that could be checked without having to read the whole
payload. As you said, it was a choice.
I believe that the RFC says that a negotiation can happen after
authentication but that doesn't provide any real protection against downgrade.
I'd prefer that this sort of protection was left to 3rd party implementations
in the form of additional authorization checks against mechanism usage.
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