The WebRequest.Create(Uri) method returns a descendant of the System.Net.WebRequest class determined at run time as the closest registered match for requestUri.

For example, if you create a System.Net.WebRequest descendant, Handler1, to handle requests to http://www.contoso.com/text/ and another named Handler2 to handle requests to http://www.contoso.com/code/, you can use WebRequest.Create(Uri) method to return the WebRequest descendant associated with either specified URI.

To return a descendant of the System.Net.WebRequest class based on only the scheme portion of a URI, use the WebRequest.CreateDefault(Uri) method.

For example, when a URI beginning with http:// or https:// is passed in requestUri, an System.Net.HttpWebRequest is returned by WebRequest.Create(Uri). If a URI beginning with ftp:// is passed instead, the WebRequest.Create(Uri) method will return a System.Net.FileWebRequest instance. If a URI beginning with file:// is passed instead, the WebRequest.Create(Uri) method will return a System.Net.FileWebRequest instance.

The pre-registered reserve types already registered include the following:

• http://

• https://

• ftp://

• file://

The .NET Framework includes support for the http://, https://, ftp://, and file:// URI schemes. Custom System.Net.WebRequest descendants to handle other requests are registered with the WebRequest.RegisterPrefix(string, IWebRequestCreate) method.

Namespace: System.Net
Assembly: System (in System.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0, 4.0.0.0