I call WebRequest.GetResponse() and encounter the error:

The server committed a protocol violation. Section=ResponseStatusLine

I google this error and add the following lines in web.config:

<configuration> 
 <system.net> 
  <settings> 
   <httpWebRequest useUnsafeHeaderParsing="true" /> 
  </settings> 
 </system.net> 
</configuration>

However, it doesn't work.

Here is my ASP.net code:

HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
request.Method = "HEAD"; 
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
......
}