HttpWebRequest.Proxy HttpWebRequest.Proxy HttpWebRequest.Proxy HttpWebRequest.Proxy Property

Definition

Gets or sets proxy information for the request.

public:
 virtual property System::Net::IWebProxy ^ Proxy { System::Net::IWebProxy ^ get(); void set(System::Net::IWebProxy ^ value); };
public override System.Net.IWebProxy Proxy { get; set; }
member this.Proxy : System.Net.IWebProxy with get, set
Public Overrides Property Proxy As IWebProxy

Property Value

The IWebProxy object to use to proxy the request. The default value is set by calling the Select property.

Exceptions

The caller does not have permission for the requested operation.

Examples

The following code example uses the Proxy method to get the proxy information for the request.

// Create a new request to the mentioned URL.
HttpWebRequest ^ myWebRequest =
    (HttpWebRequest ^) (WebRequest::Create("http://www.microsoft.com"));

// Obtain the 'Proxy' of the  Default browser.  
IWebProxy ^ proxy = myWebRequest->Proxy;
// Print the Proxy Url to the console.
if (proxy) 
{
    Console::WriteLine("Proxy: {0}",
        proxy->GetProxy(myWebRequest->RequestUri));
} 
else 
{
    Console::WriteLine("Proxy is null; no proxy will be used");
}

WebProxy ^ myProxy = gcnew WebProxy;

Console::WriteLine("\nPlease enter the new Proxy Address that is to be set:");
Console::WriteLine("(Example:http://myproxy.example.com:port)");
String ^ proxyAddress;

try 
{
    proxyAddress = Console::ReadLine();
    if (proxyAddress->Length > 0) {
        Console::WriteLine("\nPlease enter the Credentials ");
        Console::WriteLine("Username:");
        String ^ username;
        username = Console::ReadLine();
        Console::WriteLine("\nPassword:");
        String ^ password;
        password = Console::ReadLine();
        // Create a new Uri object.
        Uri ^ newUri = gcnew Uri(proxyAddress);
        // Associate the newUri object to 'myProxy' object so that new myProxy settings can be set.
        myProxy->Address = newUri;
        // Create a NetworkCredential object and associate it with the Proxy property of request object.
        myProxy->Credentials =
            gcnew NetworkCredential(username, password);
        myWebRequest->Proxy = myProxy;
    }
    Console::WriteLine("\nThe Address of the  new Proxy settings are {0}",
                  myProxy->Address);
    HttpWebResponse ^ myWebResponse =
        (HttpWebResponse ^) (myWebRequest->GetResponse());
// Create a new request to the mentioned URL.				
HttpWebRequest myWebRequest=(HttpWebRequest)WebRequest.Create("http://www.microsoft.com");

// Obtain the 'Proxy' of the  Default browser.  
IWebProxy proxy = myWebRequest.Proxy;
// Print the Proxy Url to the console.
if (proxy != null)
{
    Console.WriteLine("Proxy: {0}", proxy.GetProxy(myWebRequest.RequestUri));
} 
else
{
    Console.WriteLine("Proxy is null; no proxy will be used");
}

WebProxy myProxy=new WebProxy();

Console.WriteLine("\nPlease enter the new Proxy Address that is to be set:");
Console.WriteLine("(Example:http://myproxy.example.com:port)");
string proxyAddress;

try
{
    proxyAddress =Console.ReadLine();
    if(proxyAddress.Length>0)
    {
        Console.WriteLine("\nPlease enter the Credentials (may not be needed)");
        Console.WriteLine("Username:");
        string username;
        username =Console.ReadLine();
        Console.WriteLine("\nPassword:");
        string password;
        password =Console.ReadLine();					
        // Create a new Uri object.
        Uri newUri=new Uri(proxyAddress);
        // Associate the newUri object to 'myProxy' object so that new myProxy settings can be set.
        myProxy.Address=newUri;
        // Create a NetworkCredential object and associate it with the 
        // Proxy property of request object.
        myProxy.Credentials=new NetworkCredential(username,password);
        myWebRequest.Proxy=myProxy;
    }
    Console.WriteLine("\nThe Address of the  new Proxy settings are {0}",myProxy.Address);
    HttpWebResponse myWebResponse=(HttpWebResponse)myWebRequest.GetResponse();
   ' Create a new request to the mentioned URL.				
   Dim myWebRequest As HttpWebRequest = CType(WebRequest.Create("http://www.microsoft.com"), HttpWebRequest)

' Obtain the 'Proxy' of the  Default browser.  
Dim proxy as IWebProxy = CType(myWebRequest.Proxy, IWebProxy)
' Print the Proxy Url to the console.
   If Not proxy Is Nothing Then
       Console.WriteLine("Proxy: {0}", proxy.GetProxy(myWebRequest.RequestUri))
   Else
       Console.WriteLine("Proxy is null; no proxy will be used")
   End If

   Dim myProxy As New WebProxy()

   Console.WriteLine(ControlChars.Cr + "Please enter the new Proxy Address that is to be set ")
   Console.WriteLine("(Example:http://myproxy.example.com:port)")
   Dim proxyAddress As String
   Try
       proxyAddress = Console.ReadLine()
       If proxyAddress.Length = 0 Then
           myWebRequest.Proxy = myProxy
       Else
           Console.WriteLine(ControlChars.Cr + "Please enter the Credentials (may not be needed)")
           Console.WriteLine("Username:")
           Dim username As String
           username = Console.ReadLine()
           Console.WriteLine(ControlChars.Cr + "Password:")
           Dim password As String
           password = Console.ReadLine()
           ' Create a new Uri object.
           Dim newUri As New Uri(proxyAddress)
           ' Associate the newUri object to 'myProxy' object so that new myProxy settings can be set.
           myProxy.Address = newUri
           ' Create a NetworkCredential object and associate it with the Proxy property of request object.
           myProxy.Credentials = New NetworkCredential(username, password)
           myWebRequest.Proxy = myProxy
       End If
       Console.WriteLine(ControlChars.Cr + "The Address of the  new Proxy settings are {0}", myProxy.Address)
       Dim myWebResponse As HttpWebResponse = CType(myWebRequest.GetResponse(), HttpWebResponse)

Remarks

The Proxy property identifies the WebProxy object to use to process requests to Internet resources. To specify that no proxy should be used, set the Proxy property to the proxy instance returned by the GlobalProxySelection.GetEmptyWebProxy method.

The local computer or application config file may specify that a default proxy be used. If the Proxy property is specified, then the proxy settings from the Proxy property override the local computer or application config file and the HttpWebRequest instance will use the proxy settings specified. If no proxy is specified in a config file and the Proxy property is unspecified, the HttpWebRequest class uses the proxy settings inherited from Internet Explorer on the local computer. If there are no proxy settings in Internet Explorer, the request is sent directly to the server.

The HttpWebRequest class parses a proxy bypass list with wildcard characters inherited from Internet Explorer the same as the bypass list is parsed directly by Internet Explorer. For example, the HttpWebRequest class will parse a bypass list of "nt*" from Internet Explorer as a regular expression of "nt.*". So a URL of "http://nt.com" would bypass the proxy using the HttpWebRequest class and using Internet Explorer.

The HttpWebRequest class supports local proxy bypass. The class considers a destination to be local if any of the following conditions are met:

  • The destination contains a flat name (no dots in the URL).

  • The destination contains a loopback address (Loopback or IPv6Loopback) or the destination contains an IPAddress assigned to the local computer.

  • The domain suffix of the destination matches the local computer's domain suffix (DomainName).

Changing the Proxy property after the request has been started by calling the GetRequestStream, BeginGetRequestStream, GetResponse, or BeginGetResponse method throws an InvalidOperationException. For information on the proxy element see <defaultProxy> Element (Network Settings).

Security

WebPermission
To get or set the Proxy property. Associated enumeration: Unrestricted

Applies to

See also