我收到了一些非常奇怪的行为，与HttpWebRequest的我希望有人能帮助我。我有一个控制台应用程序，做一些聚集的工作由通过使用HttpWebRequest对象来检索目标网站的内容。由于要求的性质的应用程序是多线程的，并试图使10和30个并发连接（我一直在尝试用一个范围值）之间的任何地方。实际的Web请求的结构如下：

I'm getting some very strange behaviour with HttpWebRequest I hope someone can help me with. I have a console app which does some aggregation work by by using the HttpWebRequest object to retrieve the contents of a target website. Due to the nature of the requirement the app is multithreaded and attempts to make anywhere between 10 and 30 simultaneous connections (I've been experimenting with a range of values). The actual web request is structured as follows:

var req = (HttpWebRequest)WebRequest.Create(url);
WebResponse resp = req.GetResponse();
Stream s = resp.GetResponseStream();
var sr = new StreamReader(s, Encoding.ASCII);
string doc = sr.ReadToEnd();
sr.Close();
resp.Close();
return doc;

反正奇怪的现象是，在正常情况下的应用程序是实现每分钟大约120请求，但如果我打开提琴手它跳到约600。使用Windows 7资源监视器，我可以看到相应的网络活动增加。在控制台进程的TCP连接现在列出远程地址为IPv4的环回，而不是目标服务器的IP地址（预期）。我也想知道由机器允许的，但同时HTTP请求的最大数量在注册表中更改此似乎并没有有所作为。

Anyway, the strange behaviour is that under normal circumstances the app is achieving around 120 requests per minute but if I open up Fiddler it jumps to about 600. Using Windows 7 Resource Monitor I can see the network activity increase accordingly. The TCP connections for the console process now list the remote address as "IPv4 loopback" rather than the target server IP address (expected). I did wonder about the max number of simultaneous HTTP requests allowed by the machine but changing this in the registry does not seem to make a difference.

所以，问题是;它是什么有关运行提琴手这突然增加吞吐量五倍，我怎么能做到这一点的本地机器上，而无需启动另一个工具吗？

So the question is; what is it about running Fiddler which suddenly increases the throughput five-fold and how can I achieve this natively on the machine without needing to launch another tool?

谢谢！

推荐答案

看起来像我现在已经能够得到吞吐量直到通过设置最大连接数（增加一倍，我是越来越有小提琴手开放实际上） App.config中：

Looks like I've now been able to get the throughput right up (to double that I was getting with Fiddler open actually) by setting the max connections in the App.config:

<system.net>
  <connectionManagement>
    <add address="*" maxconnection="30" />
  </connectionManagement>
</system.net>

非常满意的结果，但我还是有点困惑，为什么有提琴手开放改变了结果，因此大幅提升。

Very happy with the result but am still a little mystified as to why having Fiddler open changed the results so dramatically.