Oh right, now I see the: ["error", { type: "unknownMethod"}, "client-id"] -bit. Still, it sounds like you're reinventing HTTP verbs and statuscodes and embeddin

Oh right, now I see the: ["error", { type: "unknownMethod"}, "client-id"] -bit. Still, it sounds like you're reinventing HTTP verbs and statuscodes and embedding them inline in the JSON just to be able to multiplex the calls. Might as well use HTTP2 or SPDY, then. Also, caching JMAP may be easy on the client side, but not for any intermediate cache - unless it understands JMAP. I'm not saying RPC over HTTP is bad, mind, but you do seem to lose some of the benefits of HTTP.