HttpClient Class

Reference

Definition

Namespace:: System.Net.Http

Assembly:: System.Net.Http.dll

Assembly:: netstandard.dll

Source:: HttpClient.cs

Source:: HttpClient.cs

Source:: HttpClient.cs

Important

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

public ref class HttpClient : System::Net::Http::HttpMessageInvoker

public class HttpClient : System.Net.Http.HttpMessageInvoker

type HttpClient = class
    inherit HttpMessageInvoker

Public Class HttpClient
Inherits HttpMessageInvoker

Inheritance: Object

HttpMessageInvoker
HttpClient

Examples

// HttpClient is intended to be instantiated once per application, rather than per-use. See Remarks.
static readonly HttpClient client = new HttpClient();

static async Task Main()
{
    // Call asynchronous network methods in a try/catch block to handle exceptions.
    try
    {
        using HttpResponseMessage response = await client.GetAsync("http://www.contoso.com/");
        response.EnsureSuccessStatusCode();
        string responseBody = await response.Content.ReadAsStringAsync();
        // Above three lines can be replaced with new helper method below
        // string responseBody = await client.GetStringAsync(uri);

        Console.WriteLine(responseBody);
    }
    catch (HttpRequestException e)
    {
        Console.WriteLine("\nException Caught!");
        Console.WriteLine("Message :{0} ", e.Message);
    }
}

open System.Net.Http

// HttpClient is intended to be instantiated once per application, rather than per-use. See Remarks.
let client = new HttpClient()

let main =
    task {
        // Call asynchronous network methods in a try/catch block to handle exceptions.
        try
            use! response = client.GetAsync "http://www.contoso.com/"
            response.EnsureSuccessStatusCode() |> ignore
            let! responseBody = response.Content.ReadAsStringAsync()
            // Above three lines can be replaced with new helper method below
            // let! responseBody = client.GetStringAsync uri

            printfn $"{responseBody}"
        with
        | :? HttpRequestException as e ->
            printfn "\nException Caught!"
            printfn $"Message :{e.Message} "
    }

main.Wait()

' HttpClient is intended to be instantiated once per application, rather than per-use. See Remarks.
Shared ReadOnly client As HttpClient = New HttpClient()

Private Shared Async Function Main() As Task
    ' Call asynchronous network methods in a try/catch block to handle exceptions.
    Try
        Using response As HttpResponseMessage = Await client.GetAsync("http://www.contoso.com/")
            response.EnsureSuccessStatusCode()
            Dim responseBody As String = Await response.Content.ReadAsStringAsync()
            ' Above three lines can be replaced with new helper method below
            ' Dim responseBody As String = Await client.GetStringAsync(uri)

            Console.WriteLine(responseBody)
        End Using
    Catch e As HttpRequestException
        Console.WriteLine(Environment.NewLine & "Exception Caught!")
        Console.WriteLine("Message :{0} ", e.Message)
    End Try
End Function

Remarks

For more information about this API, see Supplemental API remarks for HttpClient.

Constructors

HttpClient()	Initializes a new instance of the HttpClient class using a HttpClientHandler that is disposed when this instance is disposed.
HttpClient(HttpMessageHandler, Boolean)	Initializes a new instance of the HttpClient class with the provided handler, and specifies whether that handler should be disposed when this instance is disposed.
HttpClient(HttpMessageHandler)	Initializes a new instance of the HttpClient class with the specified handler. The handler is disposed when this instance is disposed.

Properties

BaseAddress	Gets or sets the base address of Uniform Resource Identifier (URI) of the Internet resource used when sending requests.
DefaultProxy	Gets or sets the global HTTP proxy.
DefaultRequestHeaders	Gets the headers which should be sent with each request.
DefaultRequestVersion	Gets or sets the default HTTP version used on subsequent requests made by this HttpClient instance.
DefaultVersionPolicy	Gets or sets the default version policy for implicitly created requests in convenience methods, for example, GetAsync(String) and PostAsync(String, HttpContent).
MaxResponseContentBufferSize	Gets or sets the maximum number of bytes to buffer when reading the response content.
Timeout	Gets or sets the timespan to wait before the request times out.

Methods

CancelPendingRequests()	Cancel all pending requests on this instance.
DeleteAsync(String, CancellationToken)	Send a DELETE request to the specified Uri with a cancellation token as an asynchronous operation.
DeleteAsync(String)	Send a DELETE request to the specified Uri as an asynchronous operation.
DeleteAsync(Uri, CancellationToken)	Send a DELETE request to the specified Uri with a cancellation token as an asynchronous operation.
DeleteAsync(Uri)	Send a DELETE request to the specified Uri as an asynchronous operation.
Dispose()	Releases the unmanaged resources and disposes of the managed resources used by the HttpMessageInvoker. (Inherited from HttpMessageInvoker)
Dispose(Boolean)	Releases the unmanaged resources used by the HttpClient and optionally disposes of the managed resources.
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetAsync(String, CancellationToken)	Send a GET request to the specified Uri with a cancellation token as an asynchronous operation.
GetAsync(String, HttpCompletionOption, CancellationToken)	Send a GET request to the specified Uri with an HTTP completion option and a cancellation token as an asynchronous operation.
GetAsync(String, HttpCompletionOption)	Send a GET request to the specified Uri with an HTTP completion option as an asynchronous operation.
GetAsync(String)	Send a GET request to the specified Uri as an asynchronous operation.
GetAsync(Uri, CancellationToken)	Send a GET request to the specified Uri with a cancellation token as an asynchronous operation.
GetAsync(Uri, HttpCompletionOption, CancellationToken)	Send a GET request to the specified Uri with an HTTP completion option and a cancellation token as an asynchronous operation.
GetAsync(Uri, HttpCompletionOption)	Send a GET request to the specified Uri with an HTTP completion option as an asynchronous operation.
GetAsync(Uri)	Send a GET request to the specified Uri as an asynchronous operation.
GetByteArrayAsync(String, CancellationToken)	Sends a GET request to the specified Uri and return the response body as a byte array in an asynchronous operation.
GetByteArrayAsync(String)	Sends a GET request to the specified Uri and return the response body as a byte array in an asynchronous operation.
GetByteArrayAsync(Uri, CancellationToken)	Send a GET request to the specified Uri and return the response body as a byte array in an asynchronous operation.
GetByteArrayAsync(Uri)	Send a GET request to the specified Uri and return the response body as a byte array in an asynchronous operation.
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetStreamAsync(String, CancellationToken)	Send a GET request to the specified Uri and return the response body as a stream in an asynchronous operation.
GetStreamAsync(String)	Send a GET request to the specified Uri and return the response body as a stream in an asynchronous operation.
GetStreamAsync(Uri, CancellationToken)	Send a GET request to the specified Uri and return the response body as a stream in an asynchronous operation.
GetStreamAsync(Uri)	Send a GET request to the specified Uri and return the response body as a stream in an asynchronous operation.
GetStringAsync(String, CancellationToken)	Send a GET request to the specified Uri and return the response body as a string in an asynchronous operation.
GetStringAsync(String)	Send a GET request to the specified Uri and return the response body as a string in an asynchronous operation.
GetStringAsync(Uri, CancellationToken)	Send a GET request to the specified Uri and return the response body as a string in an asynchronous operation.
GetStringAsync(Uri)	Send a GET request to the specified Uri and return the response body as a string in an asynchronous operation.
GetType()	Gets the Type of the current instance. (Inherited from Object)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
PatchAsync(String, HttpContent, CancellationToken)	Sends a PATCH request with a cancellation token to a Uri represented as a string as an asynchronous operation.
PatchAsync(String, HttpContent)	Sends a PATCH request to a Uri designated as a string as an asynchronous operation.
PatchAsync(Uri, HttpContent, CancellationToken)	Sends a PATCH request with a cancellation token as an asynchronous operation.
PatchAsync(Uri, HttpContent)	Sends a PATCH request as an asynchronous operation.
PostAsync(String, HttpContent, CancellationToken)	Send a POST request with a cancellation token as an asynchronous operation.
PostAsync(String, HttpContent)	Send a POST request to the specified Uri as an asynchronous operation.
PostAsync(Uri, HttpContent, CancellationToken)	Send a POST request with a cancellation token as an asynchronous operation.
PostAsync(Uri, HttpContent)	Send a POST request to the specified Uri as an asynchronous operation.
PutAsync(String, HttpContent, CancellationToken)	Send a PUT request with a cancellation token as an asynchronous operation.
PutAsync(String, HttpContent)	Send a PUT request to the specified Uri as an asynchronous operation.
PutAsync(Uri, HttpContent, CancellationToken)	Send a PUT request with a cancellation token as an asynchronous operation.
PutAsync(Uri, HttpContent)	Send a PUT request to the specified Uri as an asynchronous operation.
Send(HttpRequestMessage, CancellationToken)	Sends an HTTP request with the specified request and cancellation token.
Send(HttpRequestMessage, CancellationToken)	Sends an HTTP request with the specified request and cancellation token. (Inherited from HttpMessageInvoker)
Send(HttpRequestMessage, HttpCompletionOption, CancellationToken)	Sends an HTTP request with the specified request, completion option and cancellation token.
Send(HttpRequestMessage, HttpCompletionOption)	Sends an HTTP request.
Send(HttpRequestMessage)	Sends an HTTP request with the specified request.
SendAsync(HttpRequestMessage, CancellationToken)	Send an HTTP request as an asynchronous operation.
SendAsync(HttpRequestMessage, HttpCompletionOption, CancellationToken)	Send an HTTP request as an asynchronous operation.
SendAsync(HttpRequestMessage, HttpCompletionOption)	Send an HTTP request as an asynchronous operation.
SendAsync(HttpRequestMessage)	Send an HTTP request as an asynchronous operation.
ToString()	Returns a string that represents the current object. (Inherited from Object)

Extension Methods

DeleteFromJsonAsync(HttpClient, String, Type, JsonSerializerOptions, CancellationToken)	Sends a DELETE request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
DeleteFromJsonAsync(HttpClient, String, Type, JsonSerializerContext, CancellationToken)	Sends a DELETE request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
DeleteFromJsonAsync(HttpClient, String, Type, CancellationToken)	Sends a DELETE request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
DeleteFromJsonAsync(HttpClient, Uri, Type, JsonSerializerOptions, CancellationToken)	Sends a DELETE request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
DeleteFromJsonAsync(HttpClient, Uri, Type, JsonSerializerContext, CancellationToken)	Sends a DELETE request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
DeleteFromJsonAsync(HttpClient, Uri, Type, CancellationToken)	Sends a DELETE request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
DeleteFromJsonAsync<TValue>(HttpClient, String, JsonSerializerOptions, CancellationToken)	Sends a DELETE request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
DeleteFromJsonAsync<TValue>(HttpClient, String, JsonTypeInfo<TValue>, CancellationToken)	Sends a DELETE request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
DeleteFromJsonAsync<TValue>(HttpClient, String, CancellationToken)	Sends a DELETE request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
DeleteFromJsonAsync<TValue>(HttpClient, Uri, JsonSerializerOptions, CancellationToken)	Sends a DELETE request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
DeleteFromJsonAsync<TValue>(HttpClient, Uri, JsonTypeInfo<TValue>, CancellationToken)	Sends a DELETE request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
DeleteFromJsonAsync<TValue>(HttpClient, Uri, CancellationToken)	Sends a DELETE request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
GetFromJsonAsAsyncEnumerable<TValue>(HttpClient, String, JsonSerializerOptions, CancellationToken)	Sends an `HTTP GET` request to the specified `requestUri` and returns the value that results from deserializing the response body as JSON in an async enumerable operation.
GetFromJsonAsAsyncEnumerable<TValue>(HttpClient, String, JsonTypeInfo<TValue>, CancellationToken)	Sends an `HTTP GET`request to the specified `requestUri` and returns the value that results from deserializing the response body as JSON in an async enumerable operation.
GetFromJsonAsAsyncEnumerable<TValue>(HttpClient, String, CancellationToken)	Sends an `HTTP GET`request to the specified `requestUri` and returns the value that results from deserializing the response body as JSON in an async enumerable operation.
GetFromJsonAsAsyncEnumerable<TValue>(HttpClient, Uri, JsonSerializerOptions, CancellationToken)	Sends an `HTTP GET`request to the specified `requestUri` and returns the value that results from deserializing the response body as JSON in an async enumerable operation.
GetFromJsonAsAsyncEnumerable<TValue>(HttpClient, Uri, JsonTypeInfo<TValue>, CancellationToken)	Sends an `HTTP GET`request to the specified `requestUri` and returns the value that results from deserializing the response body as JSON in an async enumerable operation.
GetFromJsonAsAsyncEnumerable<TValue>(HttpClient, Uri, CancellationToken)	Sends an `HTTP GET`request to the specified `requestUri` and returns the value that results from deserializing the response body as JSON in an async enumerable operation.
GetFromJsonAsync(HttpClient, String, Type, JsonSerializerOptions, CancellationToken)	Sends a GET request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
GetFromJsonAsync(HttpClient, String, Type, JsonSerializerContext, CancellationToken)	Sends a GET request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
GetFromJsonAsync(HttpClient, String, Type, CancellationToken)	Sends a GET request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
GetFromJsonAsync(HttpClient, Uri, Type, JsonSerializerOptions, CancellationToken)	Sends a GET request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
GetFromJsonAsync(HttpClient, Uri, Type, JsonSerializerContext, CancellationToken)	Sends a GET request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
GetFromJsonAsync(HttpClient, Uri, Type, CancellationToken)	Sends a GET request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
GetFromJsonAsync<TValue>(HttpClient, String, JsonSerializerOptions, CancellationToken)	Sends a GET request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
GetFromJsonAsync<TValue>(HttpClient, String, JsonTypeInfo<TValue>, CancellationToken)	Sends a GET request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
GetFromJsonAsync<TValue>(HttpClient, String, CancellationToken)	Sends a GET request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
GetFromJsonAsync<TValue>(HttpClient, Uri, JsonSerializerOptions, CancellationToken)	Sends a GET request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
GetFromJsonAsync<TValue>(HttpClient, Uri, JsonTypeInfo<TValue>, CancellationToken)	Sends a GET request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
GetFromJsonAsync<TValue>(HttpClient, Uri, CancellationToken)	Sends a GET request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation.
PatchAsJsonAsync<TValue>(HttpClient, String, TValue, JsonSerializerOptions, CancellationToken)	Sends a PATCH request to the specified Uri containing the `value` serialized as JSON in the request body.
PatchAsJsonAsync<TValue>(HttpClient, String, TValue, JsonTypeInfo<TValue>, CancellationToken)	Sends a PATCH request to the specified Uri containing the `value` serialized as JSON in the request body.
PatchAsJsonAsync<TValue>(HttpClient, String, TValue, CancellationToken)	Sends a PATCH request to the specified Uri containing the `value` serialized as JSON in the request body.
PatchAsJsonAsync<TValue>(HttpClient, Uri, TValue, JsonSerializerOptions, CancellationToken)	Sends a PATCH request to the specified Uri containing the `value` serialized as JSON in the request body.
PatchAsJsonAsync<TValue>(HttpClient, Uri, TValue, JsonTypeInfo<TValue>, CancellationToken)	Sends a PATCH request to the specified Uri containing the `value` serialized as JSON in the request body.
PatchAsJsonAsync<TValue>(HttpClient, Uri, TValue, CancellationToken)	Sends a PATCH request to the specified Uri containing the `value` serialized as JSON in the request body.
PostAsJsonAsync<TValue>(HttpClient, String, TValue, JsonSerializerOptions, CancellationToken)	Sends a POST request to the specified Uri containing the `value` serialized as JSON in the request body.
PostAsJsonAsync<TValue>(HttpClient, String, TValue, JsonTypeInfo<TValue>, CancellationToken)	Sends a POST request to the specified Uri containing the `value` serialized as JSON in the request body.
PostAsJsonAsync<TValue>(HttpClient, String, TValue, CancellationToken)	Sends a POST request to the specified Uri containing the `value` serialized as JSON in the request body.
PostAsJsonAsync<TValue>(HttpClient, Uri, TValue, JsonSerializerOptions, CancellationToken)	Sends a POST request to the specified Uri containing the `value` serialized as JSON in the request body.
PostAsJsonAsync<TValue>(HttpClient, Uri, TValue, JsonTypeInfo<TValue>, CancellationToken)	Sends a POST request to the specified Uri containing the `value` serialized as JSON in the request body.
PostAsJsonAsync<TValue>(HttpClient, Uri, TValue, CancellationToken)	Sends a POST request to the specified Uri containing the `value` serialized as JSON in the request body.
PutAsJsonAsync<TValue>(HttpClient, String, TValue, JsonSerializerOptions, CancellationToken)	Send a PUT request to the specified Uri containing the `value` serialized as JSON in the request body.
PutAsJsonAsync<TValue>(HttpClient, String, TValue, JsonTypeInfo<TValue>, CancellationToken)	Send a PUT request to the specified Uri containing the `value` serialized as JSON in the request body.
PutAsJsonAsync<TValue>(HttpClient, String, TValue, CancellationToken)	Send a PUT request to the specified Uri containing the `value` serialized as JSON in the request body.
PutAsJsonAsync<TValue>(HttpClient, Uri, TValue, JsonSerializerOptions, CancellationToken)	Send a PUT request to the specified Uri containing the `value` serialized as JSON in the request body.
PutAsJsonAsync<TValue>(HttpClient, Uri, TValue, JsonTypeInfo<TValue>, CancellationToken)	Send a PUT request to the specified Uri containing the `value` serialized as JSON in the request body.
PutAsJsonAsync<TValue>(HttpClient, Uri, TValue, CancellationToken)	Send a PUT request to the specified Uri containing the `value` serialized as JSON in the request body.

Applies to

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