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WebProxy.IsBypassed Method

Indicates whether to use the proxy server for the specified host.

Namespace:  System.Net
Assembly:  System (in System.dll)

Public Function IsBypassed ( _
	host As Uri _
) As Boolean
Dim instance As WebProxy 
Dim host As Uri 
Dim returnValue As Boolean 

returnValue = instance.IsBypassed(host)


Type: System.Uri

The Uri instance of the host to check for proxy use.

Return Value

Type: System.Boolean
true if the proxy server should not be used for host; otherwise, false.



The IsBypassed method is used to determine whether to bypass the proxy server when accessing an Internet resource.

The BypassProxyOnLocal and BypassList properties control the return value of the IsBypassed method.

IsBypassed returns true under any of the following conditions:

  • If BypassProxyOnLocal is true and host is a local URI. Local requests are identified by the lack of a period (.) in the URI, as in "http://webserver/".

  • If host matches a regular expression in BypassList.

  • If Address is Nothing.

All other conditions return false.

The following code example creates a WebProxy object and calls this method to check whether the bypass list is properly set.

No code example is currently available or this language may not be supported.
WebProxy* CreateProxyAndCheckBypass(bool bypassLocal)
    // Do not use the proxy server for URIs.
    String* bypassList[] = {S";*"};
    WebProxy* proxy =  new WebProxy(S"http://contoso", 

    // Test the bypass list.
    if (!proxy->IsBypassed(new Uri(S"")))
        Console::WriteLine(S"Bypass not working!");
        return 0;
        Console::WriteLine(S"Bypass is working.");
        return proxy;

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0