/// <summary>
/// 执行指定方法的请求，将返回内容保存在指定路径的文件中
/// </summary>
/// <param name="filePath">包含文件名的路径</param>
/// <param name="method">http Method</param>
/// <returns></returns>
public long ExecuteForFile(string filePath, Method method)
{
var stream = ExecutForStream(method);
long total = _response.ContentLength;
return(EasyHttpUtils.ReadAllAsFile(stream, total, filePath));
}