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: demo.pb.gw.go
    path of file: ./repos/easy-tips/docker/go-otel/src/grpc-demo/demo
    
    the code of the file until where you have to start completion: // Code generated by protoc-gen-grpc-gateway. DO NOT EDIT.
// source: demo.proto

/*
Package demo is a reverse proxy.

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

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

	"github.com/golang/protobuf/proto"
	"github.com/grpc-ecosystem/grpc-gateway/runtime"
	"github.com/grpc-ecosystem/grpc-gateway/utilities"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/grpclog"
	"google.golang.org/grpc/status"
)

var _ codes.Code
var _ io.Reader
var _ status.Status
var _ = runtime.String
var _ = utilities.NewDoubleArray

var (
	filter_Greeter_SayHello_0 = &utilities.DoubleArray{Encoding: map[string]int{}, Base: []int(nil), Check: []int(nil)}
)

func request_Greeter_SayHello_0(ctx context.Con
    
func RegisterGreeterHandlerClient(ctx context.Context, mux *runtime.ServeMux, client GreeterClient) error {

	mux.Handle("GET", pattern_Greeter_SayHello_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
		ctx, cancel := context.WithCancel(req.Context())
		defer cancel()
		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
		rctx, err := runtime.AnnotateContext(ctx, mux, req)
		if err != nil {
			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
			return
		}
		resp, md, err := request_Greeter_SayHello_0(rctx, inboundMarshaler, client, req, pathParams)
		ctx = runtime.NewServerMetadataContext(ctx, md)
		if err != nil {
			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
			return
		}

		forward_Greeter_SayHello_0(ctx, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)

	})

	return nil
}