You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: greeter.pb.gw.go
    path of file: ./repos/stack-rpc-tutorials/examples/deprecated/middle-practices/micro-grpc/proto/go/grpc-gw/greeter
    
    the code of the file until where you have to start completion: // Code generated by protoc-gen-grpc-gateway. DO NOT EDIT.
// source: greeter/greeter.proto

/*
Package greeter is a reverse proxy.

It translates gRPC into RESTful JSON APIs.
*/
package greeter

import (
	"context"
	"io"
	"net/http"

	"github.com/go
    
func request_Say_Hello_0(ctx context.Context, marshaler runtime.Marshaler, client SayClient, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
	var protoReq Request
	var metadata runtime.ServerMetadata

	newReader, berr := utilities.IOReaderFactory(req.Body)
	if berr != nil {
		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", berr)
	}
	if err := marshaler.NewDecoder(newReader()).Decode(&protoReq); err != nil && err != io.EOF {
		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", err)
	}

	msg, err := client.Hello(ctx, &protoReq, grpc.Header(&metadata.HeaderMD), grpc.Trailer(&metadata.TrailerMD))
	return msg, metadata, err

}