I wanted to design Slack style HTTP RPC apis

Hi everyone,

I already have REST API endpoints in my server with Swagger API spec. now I want to design RPC api with JSON. I saw in Slack, they mentioned something "HTTP RPC style" APIs.

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I would like to read more about this style. Has anyone had experience with such style?

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It will be wonderful to use Swagger API doc kind of thing in which I can see all the inputs and outputs for each RPC call.

Thank you.