How to use gRPC

I’m having troubles to connect with my API. I have to connect it trough gRPC and I don’t know how. For the moment I have got this

What is gRPC?

When troubleshooting API calls, it’s necessary to have the full url or at least the full JSON response as text (not a screenshot). Without that, I really can’t suggest anything.

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Thank you very much, as far as I know gRPC is a new communcation sistem for APIs, gRPC is able to get several requests all at once. But I don’t really know how to use it.