基本上，我试图抓住从CNET的Download.com

一个EXE

所以我创建的网络分析器，到目前为止，一切进展顺利。

下面是一个简单的链接直接拉到从他们的网站：

http://dw.com.com/redir?edId=3&siteId=4&oId=3001-20_4-10308491&ontId=20_4&spi=e6323e8d83a8b4374d43d519f1bd6757&lop=txt&tag=idl2&pid=10566981&mfgId=6250549&merId=6250549&pguid=PlvcGQoPjAEAAH5rQL0AAABv&destUrl=ftp%3A%2F%2F202.190.201.108%2Fpub%2Fryl2%2Fclient%2Finstaller-ryl2_v1673.exe

下面的问题是：当你尝试下载，它以HTTP开始，然后重定向到FTP站点。我曾尝试.NET的Web客户端和HttpWebRequest的对象，而且看起来也不能够支持重定向。

这code处的GetResponse（）失败;

  HttpWebRequest的REQ =（HttpWebRequest的）WebRequest.Create（http://dw.com.com/redir）;
WebResponse的响应= req.GetResponse（）;
 

现在，我也尝试过这样的：

  HttpWebRequest的REQ =（HttpWebRequest的）WebRequest.Create（http://dw.com.com/redir）;
req.AllowAutoRedirect = FALSE;
WebResponse的响应= req.GetResponse（）;
字符串s =新的StreamReader（response.GetResponseStream（））ReadToEnd（）。
 

和它不会抛出错误了，但是变量s原来是一个空字符串。

我不知所措！谁能帮帮忙？

解决方案

您可以得到的位置头球response.headers的值，然后创建一个新的FtpWebRequest下载该资源。

Basically, I'm trying to grab an EXE from CNet's Download.com

So i created web parser and so far all is going well.

Here is a sample link pulled directly from their site:

http://dw.com.com/redir?edId=3&siteId=4&oId=3001-20_4-10308491&ontId=20_4&spi=e6323e8d83a8b4374d43d519f1bd6757&lop=txt&tag=idl2&pid=10566981&mfgId=6250549&merId=6250549&pguid=PlvcGQoPjAEAAH5rQL0AAABv&destUrl=ftp%3A%2F%2F202.190.201.108%2Fpub%2Fryl2%2Fclient%2Finstaller-ryl2_v1673.exe

Here is the problem: When you attempt to download, it begins with HTTP, then redirects to an FTP site. I have tried .NET's WebClient and HttpWebRequest Objects, and it looks like Neither can support Redirects.

This Code Fails at GetResponse();

HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://dw.com.com/redir");
WebResponse response = req.GetResponse();

Now, I also tried this:

HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://dw.com.com/redir");
req.AllowAutoRedirect = false;
WebResponse response = req.GetResponse();
string s = new StreamReader(response.GetResponseStream()).ReadToEnd();

And it does not throw the error anymore, however variable s turns out to be an empty string.

I'm at a loss! Can anyone help out?

解决方案

You can get the value of the "Location" header from the response.headers, and then create a new FtpWebRequest to download that resource.