How to request a permission of type System.Net.WebPermission in ASP.NET MVC?

Question

I created a small web service that creates a HttpWebRequest to another website using a proxy and after i used the proxies i got that error:

Request for the permission of type 'System.Net.WebPermission, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

I have no idea about how to fix it.

Here is my code,

HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://website.com");
req.CookieContainer = c;

req.Proxy = new WebProxy("IP:PORT");

req.UserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; GTB7.4; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; InfoPath.2)";
req.Accept = "application/x-ms-application, image/jpeg, application/xaml+xml, image/gif, image/pjpeg, application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*";
req.Headers.Add("Accept-Language", "en-US");
req.ServicePoint.Expect100Continue = false;
req.AllowAutoRedirect = false;
req.Timeout = 10000;
req.Method = "GET";
req.KeepAlive = true;
req.ProtocolVersion = HttpVersion.Version10;

Answer 1

It seems that you are running into a trust related issue. You might be able to work-around the issue by including in your Web.Config, under System.Web,

<trust level="Full" />

WebPermission is not available under a medium trust environment (and you can look at this article to modify this behavior and for the reasons why you shouldn't).

However, if you require full trust you might have to reconsider the requirements of your application.