HttpWebRequest and proxy issues

[Imran Aziz]

Hello All,
I am using HttpWebRequest to fetch webpages in my ASP.net C#
application. The request works fine without the proxy, but on using the code
from within a network that uses proxy the request does not work. I tried to
use the MS code to get around it, but having problems using it. The first
thing is that the this conversion

myProxy=(WebPro xy)myWebRequest .Proxy;

does not work, and I get an error of cannot convert Webproxywrapper to
WebProxy.
The MS code is as under.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfSystemNetHttpWebRequestClassProxyTopic.asp

// Create a new request to the mentioned URL.
HttpWebRequest
myWebRequest=(H ttpWebRequest)W ebRequest.Creat e("http://www.microsoft.c om");
WebProxy myProxy=new WebProxy();
// Obtain the 'Proxy' of the Default browser.
myProxy=(WebPro xy)myWebRequest .Proxy;
// Print the Proxy Url to the console.
Console.WriteLi ne("\nThe actual default Proxy settings are
{0}",myProxy.Ad dress);
try
{
Console.WriteLi ne("\nPlease enter the new Proxy Address that is to be
set:");
Console.WriteLi ne("(Example:ht tp://myproxy.com:por t)");
string proxyAddress;
proxyAddress =Console.ReadLi ne();
if(proxyAddress .Length>0)

{
Console.WriteLi ne("\nPlease enter the Credentials ");
Console.WriteLi ne("Username:") ;
string username;
username =Console.ReadLi ne();
Console.WriteLi ne("\nPassword: ");
string password;
password =Console.ReadLi ne();
// Create a new Uri object.
Uri newUri=new Uri(proxyAddres s);
// Associate the newUri object to 'myProxy' object so that new
myProxy settings can be set.
myProxy.Address =newUri;
// Create a NetworkCredenti al object and associate it with the Proxy
property of request object.
myProxy.Credent ials=new NetworkCredenti al(username,pas sword);
myWebRequest.Pr oxy=myProxy;
}
Console.WriteLi ne("\nThe Address of the new Proxy settings are
{0}",myProxy.Ad dress);
HttpWebResponse
myWebResponse=( HttpWebResponse )myWebRequest.G etResponse();


Can anyone please help me with this?
thanks a lot.
Imran.

[Joerg Jooss]

Re: HttpWebRequest and proxy issues

Imran Aziz wrote:
[color=blue]
> Hello All,
> I am using HttpWebRequest to fetch webpages in my ASP.net C#
> application. The request works fine without the proxy, but on using
> the code from within a network that uses proxy the request does not
> work. I tried to use the MS code to get around it, but having
> problems using it. The first thing is that the this conversion
>
> myProxy=(WebPro xy)myWebRequest .Proxy;
>
> does not work, and I get an error of cannot convert Webproxywrapper
> to WebProxy. The MS code is as under.
> http://msdn.microsoft.com/library/de...ry/en-us/cpref
> /html/frlrfSystemNetH ttpWebRequestCl assProxyTopic.a sp[/color]

That cast is wrong. HttpWebRequest. Proxy is of type IWebProxy. There's
no guarantee that the class implementing this Interface is really a
WebProxy object.

There's really no point in reading the default proxy from the
HttpWebRequest if you want to use another one. Simply create a new
WebProxy object with the desired proxy URL, set the required
credentials and assign this object to the HttpWebRequest' s Proxy
property.

Cheers,

--

http://www.joergjooss.de

mailto:news-reply@joergjoos s.de