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HttpClient Class

Provides a base class for sending HTTP requests and receiving HTTP responses from a resource identified by a URI.

Inheritance Hierarchy

System.Object
  System.Net.Http.HttpMessageInvoker
    System.Net.Http.HttpClient

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

Syntax

'Declaration
Public Class HttpClient _
    Inherits HttpMessageInvoker
'Usage
Dim instance As HttpClient
public class HttpClient : HttpMessageInvoker
public ref class HttpClient : public HttpMessageInvoker
type HttpClient =  
    class 
        inherit HttpMessageInvoker 
    end
public class HttpClient extends HttpMessageInvoker

The HttpClient type exposes the following members.

Constructors

  Name Description
Public method HttpClient() Initializes a new instance of the HttpClient class.
Public method HttpClient(HttpMessageHandler) Initializes a new instance of the HttpClient class with a specific handler.
Public method HttpClient(HttpMessageHandler, Boolean) Initializes a new instance of the HttpClient class with a specific handler and a value that indicates whether this instance is responsible for disposing the handler.

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Properties

  Name Description
Public property BaseAddress Gets or sets the base address of Uniform Resource Identifier (URI) of the Internet resource used when sending requests.
Public property DefaultRequestHeaders Gets the headers which should be sent with each request.
Public property MaxResponseContentBufferSize Gets or sets the maximum number of bytes to buffer when reading the response content.
Public property Timeout Gets or sets the number of milliseconds to wait before the request times out.

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Methods

  Name Description
Public method CancelPendingRequests Cancel all pending requests on this instance.
Public method DeleteAsync(String) Sends a DELETE request to the specified Uri as an asynchronous operation.
Public method DeleteAsync(Uri) Sends a DELETE request to the specified Uri as an asynchronous operation.
Public method DeleteAsync(String, CancellationToken) Sends a DELETE request to the specified Uri with a cancellation token as an asynchronous operation.
Public method DeleteAsync(Uri, CancellationToken) Sends a DELETE request to the specified Uri with a cancellation token as an asynchronous operation.
Public method Dispose() Releases the unmanaged resources and disposes of the managed resources used by the invoker. (Inherited from HttpMessageInvoker.)
Protected method Dispose(Boolean) Releases the unmanaged resources used by the HttpClient and optionally disposes of the managed resources. (Overrides HttpMessageInvoker.Dispose(Boolean).)
Public method Equals (Inherited from Object.)
Protected method Finalize (Inherited from Object.)
Public method GetAsync(String) Sends a GET request to the specified Uri as an asynchronous operation.
Public method GetAsync(Uri) Sends a GET request to the specified Uri as an asynchronous operation.
Public method GetAsync(String, HttpCompletionOption) Sends a GET request to the specified Uri with an HTTP completion option as an asynchronous operation.
Public method GetAsync(String, CancellationToken) Sends a GET request to the specified Uri with a cancellation token as an asynchronous operation.
Public method GetAsync(Uri, HttpCompletionOption) Sends a GET request to the specified Uri with an HTTP completion option as an asynchronous operation.
Public method GetAsync(Uri, CancellationToken) Sends a GET request to the specified Uri with a cancellation token as an asynchronous operation.
Public method GetAsync(String, HttpCompletionOption, CancellationToken) Sends a GET request to the specified Uri with an HTTP completion option and a cancellation token as an asynchronous operation.
Public method GetAsync(Uri, HttpCompletionOption, CancellationToken) Sends a GET request to the specified Uri with an HTTP completion option and a cancellation token as an asynchronous operation.
Public method GetByteArrayAsync(String) Sends a GET request to the specified Uri and returns the response body as a byte array in an asynchronous operation.
Public method GetByteArrayAsync(Uri) Sends a GET request to the specified Uri and returns the response body as a byte array in an asynchronous operation.
Public method GetHashCode (Inherited from Object.)
Public method GetStreamAsync(String) Sends a GET request to the specified Uri and returns the response body as a stream in an asynchronous operation.
Public method GetStreamAsync(Uri) Sends a GET request to the specified Uri and returns the response body as a stream in an asynchronous operation.
Public method GetStringAsync(String) Sends a GET request to the specified Uri and returns the response body as a string in an asynchronous operation.
Public method GetStringAsync(Uri) Sends a GET request to the specified Uri and returns the response body as a string in an asynchronous operation.
Public method GetType (Inherited from Object.)
Protected method MemberwiseClone (Inherited from Object.)
Public method PostAsync(String, HttpContent) Sends a POST request to the specified Uri as an asynchronous operation.
Public method PostAsync(Uri, HttpContent) Sends a POST request to the specified Uri as an asynchronous operation.
Public method PostAsync(String, HttpContent, CancellationToken) Sends a POST request with a cancellation token as an asynchronous operation.
Public method PostAsync(Uri, HttpContent, CancellationToken) Sends a POST request with a cancellation token as an asynchronous operation.
Public method PutAsync(String, HttpContent) Sends a PUT request to the specified Uri as an asynchronous operation.
Public method PutAsync(Uri, HttpContent) Sends a PUT request to the specified Uri as an asynchronous operation.
Public method PutAsync(String, HttpContent, CancellationToken) Sends a PUT request with a cancellation token as an asynchronous operation.
Public method PutAsync(Uri, HttpContent, CancellationToken) Sends a PUT request with a cancellation token as an asynchronous operation.
Public method SendAsync(HttpRequestMessage) Sends an HTTP request as an asynchronous operation.
Public method SendAsync(HttpRequestMessage, HttpCompletionOption) Sends an HTTP request with an HTTP completion option as an asynchronous operation.
Public method SendAsync(HttpRequestMessage, CancellationToken) Sends an HTTP request with a cancellation token as an asynchronous operation. (Overrides HttpMessageInvoker.SendAsync(HttpRequestMessage, CancellationToken).)
Public method SendAsync(HttpRequestMessage, HttpCompletionOption, CancellationToken) Sends an HTTP request with an HTTP completion option and cancellation token as an asynchronous operation.
Public method ToString (Inherited from Object.)

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Remarks

For a complete example of using the HttpClient class, see Calling a Web API From a .NET Client

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

See Also

Reference

System.Net.Http Namespace