func ExampleFromContext(ctx context.Context) (example.ExampleService, bool) {
	c, ok := ctx.Value(exampleKey{}).(example.ExampleService)
	return c, ok
}
FromContext retrieves the client from the Context
package client
import (
	"context"
	"github.com/micro/go-micro"
	"github.com/micro/go-micro/server"
	example "github.com/hb-go/micro-quick-start/example/srv/proto/example"
)
type exampleKey struct{}