WebRequest.Create Method (Uri)

Initializes a new WebRequest instance for the specified URI scheme.

Namespace:  System.Net
Assemblies:   System (in System.dll)
  System.Net.Requests (in System.Net.Requests.dll)

public static WebRequest Create(
	Uri requestUri
)

Parameters

requestUri
Type: System.Uri

A Uri containing the URI of the requested resource.

Return Value

Type: System.Net.WebRequest
A WebRequest descendant for the specified URI scheme.

ExceptionCondition
NotSupportedException

The request scheme specified in requestUri is not registered.

ArgumentNullException

requestUri is null.

SecurityException

The caller does not have permission to connect to the requested URI or a URI that the request is redirected to.

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

For example, if you create a 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 Create method to return the WebRequest descendant associated with either specified URI.

To return a descendant of the WebRequest class based on only the scheme portion of a URI, use the CreateDefault method.

For example, when a URI beginning with http:// or https:// is passed in requestUri, an HttpWebRequest is returned by Create. If a URI beginning with ftp:// is passed instead, the Create method will return a FileWebRequest instance. If a URI beginning with file:// is passed instead, the Create method will return a 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 WebRequest descendants to handle other requests are registered with the RegisterPrefix method.

NoteNote

This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing in the .NET Framework.

The following example uses Create to instantiate an HttpWebRequest instance. A Uri representing the target URL is used as the constructor parameter.

			// Create a new 'Uri' object with the specified string.
			Uri myUri =new Uri("http://www.contoso.com");
			// Create a new request to the above mentioned URL.	
			WebRequest myWebRequest= WebRequest.Create(myUri);
			// Assign the response object of 'WebRequest' to a 'WebResponse' variable.
			WebResponse myWebResponse= myWebRequest.GetResponse();

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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