param.go
func StoreParam(ctx context.Context, name string, value string) context.Context {
	n := paramName(name)
	return context.WithValue(ctx, n, Param(value))
}
func StoreParam(ctx context.Context, name string, value string) context.Context {
	n := paramName(name)
	return context.WithValue(ctx, n, Param(value))
}
//StoreParam stores a variable in a context