如何使用HttpWebRequest创建一个C#应用程序就像fiddler一样

Question

我有一个控制台应用程序,使用20个左右的线程连接到远程Web服务器并发送相当小的大小的任意http请求,超过ssl 100%.远程Web服务器实际上是一个完整的负载平衡数据中心,其中包含高可用性系统,每秒可处理数十万个请求.这不是服务器或带宽问题.话虽如此,我没有运行它,也没有对它的配置有任何影响,所以即使我想,我也无法进行服务器端更改.

当使用fiddler运行应用程序时,应用程序执行速度惊人.当没有在小提琴手中运行时,它实际上要慢得多,以至于对于手头的任务毫无用处.它似乎也在某个时刻锁定在过程的早期,但这可能只是一个死锁问题,我还不确定.

无论如何,小提琴作为代理,无疑是以某种方式修改我的请求/连接,以确保良好的吞吐量,但我不知道它在做什么.我试图找出它,以便我可以强制我的.net应用程序模仿小提琴程序连接处理行为,而不必实际通过fiddler运行它

我已粘贴下面的连接代码.

     using System;
     using System.Collections.Generic;
     using System.Linq;
     using System.Text;
     using System.Net;
     using System.IO;

     namespace Redacted
     {
        public class HiveCommunicator
        {

           public static IResponse SendRequest(IRequest request) {

              ServicePointManager.DefaultConnectionLimit = 60;
              ServicePointManager.Expect100Continue = false;


              string hostUrlString = string.Empty;
              if (request.SiteID <= 0)
                 hostUrlString = string.Format("{0}://{1}{2}", request.UseSSL ? "https" : "http", DataCenters.GetCenter(request.DataCenter), request.Path);
              else
                 hostUrlString = string.Format("{0}://{1}{2}", request.UseSSL ? "https" : "http", DataCenters.GetCenter(request.DataCenter), string.Format(request.Path, request.SiteID));

              HttpWebRequest webRequest = (HttpWebRequest)HttpWebRequest.Create(hostUrlString);

              switch (request.ContentType)
              {
                 default:
                 case ContentTypes.XML:
                    webRequest.ContentType = "application/xml";
                    break;
                 case ContentTypes.JSON:
                    webRequest.ContentType = "application/json";
                    break;
                 case ContentTypes.BINARY:
                    webRequest.ContentType = "application/octet-stream";
                    break;
              }

              if (request.RequiresAuthorizationToken)
              {
                 AuthorizationToken tok = HiveAuthentication.GetToken(request.SiteID);
                 if (tok == null)
                 {
                    return null;
                 }
                 webRequest.Headers.Add(HttpRequestHeader.Authorization, tok.Token);
              }

              bool UsesRequestBody = true;

              switch (request.HttpVerb)
              {
                 case HttpVerbs.POST:
                    webRequest.Method = "POST";
                    break;
                 case HttpVerbs.DELETE:
                    webRequest.Method = "DELETE";
                    UsesRequestBody = false;
                    break;
                 case HttpVerbs.PUT:
                    webRequest.Method = "PUT";
                    break;
                 default:
                 case HttpVerbs.GET:
                    webRequest.Method = "GET";
                    UsesRequestBody = false;
                    break;
              }

              HttpWebResponse webResponse = null;
              Stream webRequestStream = null;

              byte[] webRequestBytes = null;
              if (UsesRequestBody)
              {
                 webRequestBytes = request.RequestBytes;
                 webRequest.ContentLength = webRequestBytes.Length;
                 webRequestStream = webRequest.GetRequestStream();
                 for (int i = 0; i < webRequest.ContentLength; i++)
                 {
                    webRequestStream.WriteByte(webRequestBytes[i]);
                 }
              }

              try
              {
                 webResponse = (HttpWebResponse)webRequest.GetResponse();
              }
              catch (WebException ex)
              {

                 webResponse = (HttpWebResponse)ex.Response;
              }

              if (UsesRequestBody)
              {
                 webRequestStream.Close();
                 webRequestStream.Dispose();
              }

              IResponse respReturn = request.ParseResponse(webResponse);
              webResponse.Close();

              return respReturn;
           }
        }
     }

Answer 1

我感谢那些试图提供帮助的人们.不幸的是,这需要致电Microsoft专业支持.

即使我正在使用ServicePointManager.Expect100Continue = false;它发生在应用程序生命周期的后期.查看System.Net.Trace日志,我们看到expect-100 continue标头仍在使用(除了使用fiddler时).解决方案是将其放入app启动(在Main()中)

我还试图在关闭请求流之前读取响应流.

修好之后,一切都很快就加快了.该应用程序运行速度快得多,没有提琴手,这是我所期望的.

有几个人说要在HttpWebResponse上调用dispose.该类没有公共Dispose方法.我假设.Close()在内部调用.Dispose().