HttpMessageHandler.SendAsync Method (HttpRequestMessage, CancellationToken)

.NET Framework (current version)

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Send an HTTP request as an asynchronous operation.

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

protected internal abstract Task<HttpResponseMessage> SendAsync(
	HttpRequestMessage request,
	CancellationToken cancellationToken


Type: System.Net.Http.HttpRequestMessage

The HTTP request message to send.

Type: System.Threading.CancellationToken

The cancellation token to cancel operation.

Return Value

Type: System.Threading.Tasks.Task<HttpResponseMessage>

The task object representing the asynchronous operation.

Exception Condition

The request was null.

This operation will not block. The returned Task<TResult> object will complete once the entire response including content is read.

The SendAsync method is used primarily by the system. This method is called by the system one of the HttpClient.SendAsync methods is called. Most apps will never call this method.

Universal Windows Platform
Available since 8
.NET Framework
Available since 4.5
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1
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