/// <summary>
/// 构造新的HttpClient实例
/// </summary>
/// <param name="url">要获取的资源的地址</param>
/// <param name="expect100Continue">是否使用100-continue行为（默认为false，对于非IIS服务器向其POST数据时可能会出现471错误，将该参数设置为false可以避免这个问题）</param>
/// <param name="context">Cookie及Referer</param>
/// <param name="keepContext">是否自动在不同的请求间保留Cookie, Referer</param>
public HttpClient(string url, bool expect100Continue, HttpClientContext context, bool keepContext)
{
ServicePointManager.Expect100Continue = expect100Continue;
this.url = url;
this.context = context;
this.keepContext = keepContext;
if (this.context == null)
this.context = new HttpClientContext();
}
/// <summary>
/// 构造新的HttpClient实例
/// </summary>
/// <param name="url">要获取的资源的地址</param>
/// <param name="expect100Continue">是否使用100-continue行为（默认为false，对于非IIS服务器向其POST数据时可能会出现471错误，将该参数设置为false可以避免这个问题）</param>
/// <param name="context">Cookie及Referer</param>
public HttpClient(string url, bool expect100Continue, HttpClientContext context)
: this(url, expect100Continue, context, false)
{
}