我遇到了麻烦代理自动配置（PAC）在IE选项使用工作按预期净的WebRequest。

I'm having trouble getting Proxy Automatic Configuration (PAC) in IE options to work as expected using .Net WebRequest.

根据这篇文章：http://msdn.microsoft.com/en-gb/magazine/cc300743.aspx#S1 该系统代理默认情况下应设置为每个WebRequest的。

According to this article: http://msdn.microsoft.com/en-gb/magazine/cc300743.aspx#S1 The system proxy should be set by default with to each WebRequest.

这是怎么的proxy.js PAC文件是这样的：

That's how the proxy.js pac file looks like:

function FindProxyForURL(url, host)
{
  return "PROXY ProxyServerName:3118; DIRECT;";
}

我也看了看这个帖子：How我应该设置默认代理使用默认凭据？

这表明添加此在App.config：

Which suggests to add this in the app.config:

<system.net>
  <defaultProxy useDefaultCredentials="true" />
</system.net>

添加这并没有帮助。

Adding this did not help.

我创建了一个小型控制台应用程序只是在这里测试了这一点。它是：

I created a small console application just to test this out.. here it is:

static void Main(string[] args)
{
    HttpWebRequest request = null;
    try
    {               
        String resolvedAddress = WebRequest.DefaultWebProxy.GetProxy(new Uri("http://www.google.com")).ToString();
        Console.WriteLine("Proxy for address is: " + resolvedAddress);

        Uri m_URLToTest = new Uri("http://www.google.com");
        request = WebRequest.Create(m_URLToTest) as HttpWebRequest;
        request.Method = "GET";
        request.KeepAlive = false;
        request.Timeout = 5000;
        request.Proxy = WebRequest.DefaultWebProxy;
        WebResponse response = request.GetResponse();
        StreamReader reader = new StreamReader(response.GetResponseStream());
        string message = reader.ReadToEnd();
    }
    catch (Exception ex)
    {
        Console.Write("Exception");
    }

}

输出： 代理服务器的地址是 http://www.google.com

The output: Proxy for address is http://www.google.com

而不是代理服务器的地址是ProxyServerName：3118

instead of Proxy for address is ProxyServerName:3118

它仅使用自动配置脚本时发生......

It happens only when using auto configuration script...

我错过了什么？请帮帮忙！

Did I miss anything? Please help!

推荐答案

找到了解决办法！

这是非常重要的PAC文件的MIME类型是：内容类型：应用程序/ x-NS-代理自动配置]

It is really important that the mime type of the PAC file would be: [Content-type: application/x-ns-proxy-autoconfig]

其他MIME类型可能无法正常工作。

Other mime types might not work.

请确保使用fiddler2（含禁用缓存）的MIME类型是合适的。 有些配置可能显示的Content-Type：text / plain的是坏的。

Make sure using fiddler2 (with cache disabled) that the mime type is appropriate. Some configurations might show Content-Type: text/plain which is bad.