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Re:JMAP: A modern, open email protocol by voidcommonstock on Monday May 06, 2019 @05:23PM (#19844025)
There is so much NIH going on in this protocol, it's as if the authors we're completely unaware of modern HTTP API design.

They're not just doing IMAP over http, they invented their own error bodies, schema's , negotiation and RPC.

Re:JMAP: A modern, open email protocol by greggyb on Monday May 06, 2019 @05:53PM (#19844293)
I think their goal is to have transport layer be a pluggable subsystem, divorced from their request-response protocol.

They even essentially say that HTTP is not necessary to their protocol, so I think it's pretty apparent that HTTP is a utilitarian choice, but they're not trying to build email-over-http.

Re:JMAP: A modern, open email protocol by specialist on Tuesday May 07, 2019 @05:12AM (#19847716)
”pluggable subsystem”

SOAP had same rationalization.