How to Detect & Enable Proxy Settings using C#

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I am developing an application that extracts data from a webpage. the organization sometimes uses a proxy server for internet connection or sometimes it odes it simply, no authentication required

1) How do I detect whether proxy is enabled, if yes then how do I connect to the specific webpage

I used the following code to connect to the webpage using proxy, but it returns error 407.

C#

HttpWebRequest httpWReq = (HttpWebRequest)WebRequest.Create("http://www.google.com");

ASCIIEncoding encoding = new ASCIIEncoding();
string postData = "username=student";
postData += "&password=student";

webRequest.Proxy = new WebProxy("http://10.10.16.1:3434/", true); 
httpWReq.Proxy = WebRequest.DefaultWebProxy;
httpWReq.Credentials = new NetworkCredential("student", "student", "http://www.google.com");

Posted 31-Jul-13 4:48am

Member 8657306

Updated 31-Jul-13 4:52am

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 31-Jul-13 10:58am

Try to connect websites other than Google.

Member 8657306 31-Jul-13 11:08am

tried, same error

Dave Kreskowiak 31-Jul-13 11:52am

407 is "Proxy authentication required". SO, that request would be going through the proxy and your not authorized to do that using your default credentials.

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Srinivas Kalabarigi · Accepted Answer · 2013-07-31T08:33:00

The following can be used for proxy detection:

C#

HttpWebRequest httpWReq = (HttpWebRequest)WebRequest.Create("http://www.google.com");
WebProxy p = (WebProxy) WebRequest.DefaultWebProxy;

if (proxy.Address.AbsoluteUri != string.Empty)
{
    // If the proxy is mentioned in the browser
    httpWReq.Proxy = proxy;
}
else
{
    ICredentials cred;
    cred = new NetworkCredential("student", "student");
    p = new WebProxy("http://10.10.16.1:3434/", true, null, cred); 
    httpWReq.Proxy = p;
}


ASCIIEncoding encoding = new ASCIIEncoding();
string postData = "username=student";
postData += "&password=student";
// rest of your code