How to implement file upload without start a HTTP servier?

[VetchM]

Hi, I just started using this framework, and I wonder how to implement an RPC that supports a file upload function. The example I found online requires starting an HTTP server. Is there a way to achieve this using just the RPC method? I mena something like this:

type Request struct {
}

type Response struct {
}

type FileServer struct{}

func (h *Helloworld) Upload(ctx context.Context, req *Request, rsp *Response) error {
}