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Some design decisions
Use 401 as return code during SASL handshake
Allow interleaving of authentication exchanges
Avoiding sending request body with every authentication step for POST/PUT methods
Currently suggest to use POST requests with no body
Use of persistent connections
required if negotiating a security layer
not required if only doing authentication, but recommended
New 2XX status codes to specify that "authentication is complete, please resubmit the original request”
Though adds additional round-trip
Use of OPTIONS method for requesting the list of supported mechanisms
PPT Version