C# 维护与web服务器的会话

我有一个WCF服务正在使用一个网站。在任何人指出这种方法的明显缺陷和固有的不稳定性之前，请原谅我，我被迫对此进行研究

交易流程如下：

public HttpWebPostResponse PostStrOnUrlRandom(string url, string strPost, string Refer, CookieCollection cookieJarR)
    {

        log.Debug("Method Entery [PostStrOnUrl]");
        StreamWriter myWriter = null;
        string resultHtml = null;
        HttpWebResponse objResponse = null;
        HttpWebPostResponse hpr = null;

        HttpWebRequest objRequest = (HttpWebRequest)WebRequest.Create(url);
        objRequest.ProtocolVersion = HttpVersion.Version10;
        objRequest.Timeout = 90000;
        objRequest.CookieContainer = cookieJar;
        objRequest.Method = "POST";
        objRequest.ContentType = "application/x-www-form-urlencoded";
        objRequest.AllowAutoRedirect = true;
        objRequest.MaximumAutomaticRedirections = 100;
        objRequest.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0";
        objRequest.Referer = Refer;
        objRequest.Host = ConfigurationManager.AppSettings["Host"];
        objRequest.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
        objRequest.Headers.Add("Origin", ConfigurationManager.AppSettings["Origin"]);
        objRequest.Headers.Add("Cache-Control", "max-age=0");
        objRequest.Headers.Add("Accept-Encoding", "gzip, deflate, br");
        objRequest.Headers.Add("Accept-Language", "en-US,en;q=0.8");
        objRequest.KeepAlive = true;

        log.Debug("Making HttpWebRequest to" + url);

        Uri target = new Uri(url);
        log.Debug("Target Url : " + url.ToString());
        foreach (Cookie cookie in cookieJarR)
        {
            objRequest.CookieContainer.Add(cookie);
            cookieJar.Add(cookie);
            log.Debug(cookie.Name + "" + cookie.Value + "" + "" + cookie.Domain);

        }

        try
        {
            myWriter = new StreamWriter(objRequest.GetRequestStream());
            myWriter.Write(strPost);
            log.Debug("Posting on Url StrPost =" + strPost);
        }
        catch (Exception e)
        {
            log.Debug(e.Message);
        }
        finally
        {
            myWriter.Close();
        }

        log.Debug("Making Request.");

        try
        {
            objResponse = (HttpWebResponse)objRequest.GetResponse();
            using (StreamReader sr =
                new StreamReader(objResponse.GetResponseStream()))
            {
                resultHtml = sr.ReadToEnd();
                sr.Close();
            }
            hpr = new HttpWebPostResponse(objResponse.ResponseUri.ToString(), resultHtml, objResponse.StatusCode.ToString());
            return hpr;
        }


        catch (Exception e)
        {
            log.Error(e.Message);
            log.Error("Exception", e.InnerException);
            return null;
        }
    }

频道->WCF服务->（HTTP POST/GET）->网站

步骤： PostStrOnUrlRandom在循环中被调用，向其传递要发布的字符串（strPost）、url（url）和CookieJar（CookieJarR），其中包含来自上一篇文章的cookies

HTTP获取url（不在下面的代码中）

我得到HTML页面的响应，使用XPATH解析它，确认它是正确的页面并保存Cookies

在url上传递此方法的POST strPost

获取响应HTML页面，使用XPATH对其进行解析

从数据库获取下一个url和strPost

在下一个url上发布下一个strPost

我必须这样做5个网址。然后我必须将响应发送回频道。然后频道又给我发了一个请求，我必须再发一篇帖子。我使用与以前请求相同的cookies来实现这一点

这就是问题所在，我返回一个内部服务器错误500。如果我真的在这篇文章上退休了，使用相同的strPost、url和Cookies，它会在3-4个退休后工作。我不明白这是为什么。

代码如下：

public HttpWebPostResponse PostStrOnUrlRandom(string url, string strPost, string Refer, CookieCollection cookieJarR)
    {

        log.Debug("Method Entery [PostStrOnUrl]");
        StreamWriter myWriter = null;
        string resultHtml = null;
        HttpWebResponse objResponse = null;
        HttpWebPostResponse hpr = null;

        HttpWebRequest objRequest = (HttpWebRequest)WebRequest.Create(url);
        objRequest.ProtocolVersion = HttpVersion.Version10;
        objRequest.Timeout = 90000;
        objRequest.CookieContainer = cookieJar;
        objRequest.Method = "POST";
        objRequest.ContentType = "application/x-www-form-urlencoded";
        objRequest.AllowAutoRedirect = true;
        objRequest.MaximumAutomaticRedirections = 100;
        objRequest.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0";
        objRequest.Referer = Refer;
        objRequest.Host = ConfigurationManager.AppSettings["Host"];
        objRequest.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
        objRequest.Headers.Add("Origin", ConfigurationManager.AppSettings["Origin"]);
        objRequest.Headers.Add("Cache-Control", "max-age=0");
        objRequest.Headers.Add("Accept-Encoding", "gzip, deflate, br");
        objRequest.Headers.Add("Accept-Language", "en-US,en;q=0.8");
        objRequest.KeepAlive = true;

        log.Debug("Making HttpWebRequest to" + url);

        Uri target = new Uri(url);
        log.Debug("Target Url : " + url.ToString());
        foreach (Cookie cookie in cookieJarR)
        {
            objRequest.CookieContainer.Add(cookie);
            cookieJar.Add(cookie);
            log.Debug(cookie.Name + "" + cookie.Value + "" + "" + cookie.Domain);

        }

        try
        {
            myWriter = new StreamWriter(objRequest.GetRequestStream());
            myWriter.Write(strPost);
            log.Debug("Posting on Url StrPost =" + strPost);
        }
        catch (Exception e)
        {
            log.Debug(e.Message);
        }
        finally
        {
            myWriter.Close();
        }

        log.Debug("Making Request.");

        try
        {
            objResponse = (HttpWebResponse)objRequest.GetResponse();
            using (StreamReader sr =
                new StreamReader(objResponse.GetResponseStream()))
            {
                resultHtml = sr.ReadToEnd();
                sr.Close();
            }
            hpr = new HttpWebPostResponse(objResponse.ResponseUri.ToString(), resultHtml, objResponse.StatusCode.ToString());
            return hpr;
        }


        catch (Exception e)
        {
            log.Error(e.Message);
            log.Error("Exception", e.InnerException);
            return null;
        }
    }