C＃优化HttpWebRequest

Question

我正在创建自己的HTTPWebRequest类，并且我正在尝试优化读取缓冲区和发出请求所需的时间，到目前为止它需要 800-1000ms 对于google.com的每个请求

C ++中的相同代码需要〜 200ms 任何建议我如何更好地优化它？

public class OWebReq
{
public string LastError;
public bool LastOK = false;
public OWebReq()
{

}
public static void Init()
{
    ServicePointManager.Expect100Continue = false;
    ServicePointManager.DefaultConnectionLimit = 9999;
    WebRequest.DefaultWebProxy = (WebProxy)null;
    ServicePointManager.ServerCertificateValidationCallback += (sender, certificate, chain, sslPolicyErrors) => true;
}
public string GET(string url, WebProxy proxy = null)
{
    LastOK = false;
    var req = (HttpWebRequest)WebRequest.Create(url);
    req.UserAgent = "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.114 Safari/537.36";
    req.Proxy = proxy;
    req.KeepAlive = false;
    req.Timeout = 5000;
    req.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
    try
    {
        using(var response=(HttpWebResponse)req.GetResponse())
        {
            var responseStream = response.GetResponseStream();
            if(responseStream!=null)
            {
                using (var sr = new StreamReader(responseStream))
                {
                    return sr.ReadToEnd();
                }

            }
        }

    }
    catch (Exception ex)
    {
        LastError = ex.Message;
        return null;
    }
     return null;
 }
}

执行代码直到var response=(HttpWebResponse)req.GetResponse()需要〜 350ms

Answer 1

尝试将ServicePointManager.Expect100Continue或req.ServicePoint.Expect100Continue设为 false 。

基本要点是，请求最初只发送标头并等待服务器响应代码100（继续）。这个上限为350毫秒。收到响应后，将发送请求正文。这样，当服务器无论如何都要拒绝请求（需要重定向或身份验证，或者标题中出现错误等）时，您不会在线路上发出非常大的请求（具有许多MB的主体）。 / p>

这link有一个非常详细的解释。