SocketsHttpHandler Class

Definition

Namespace:

System.Net.Http

Assembly:

System.Net.Http.dll

Provides the default message handler used by HttpClient in .NET Core 2.1 and later.

public ref class SocketsHttpHandler sealed : System::Net::Http::HttpMessageHandler

[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public sealed class SocketsHttpHandler : System.Net.Http.HttpMessageHandler

public sealed class SocketsHttpHandler : System.Net.Http.HttpMessageHandler

[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
type SocketsHttpHandler = class
    inherit HttpMessageHandler

type SocketsHttpHandler = class
    inherit HttpMessageHandler

Public NotInheritable Class SocketsHttpHandler
Inherits HttpMessageHandler

Inheritance

Object

HttpMessageHandler

SocketsHttpHandler

Attributes

UnsupportedOSPlatformAttribute

Remarks

Starting with .NET Core 2.1, the SocketsHttpHandler class provides the implementation used by higher-level HTTP networking classes such as HttpClient. The use of SocketsHttpHandler offers a number of advantages:

• A significant performance improvement when compared with the previous implementation.

• The elimination of platform dependencies, which simplifies deployment and servicing. For example, libcurl is no longer a dependency on .NET Core for macOS and .NET Core for Linux.

• Consistent behavior across all .NET platforms.

If this change is undesirable and you are on .NET Core 2.1-3.1, you can configure your application to use the older System.Net.Http.HttpClientHandler class instead in a number of ways:

• By calling the AppContext.SetSwitch method as follows:

  AppContext.SetSwitch("System.Net.Http.UseSocketsHttpHandler", false);
  

  AppContext.SetSwitch("System.Net.Http.UseSocketsHttpHandler", False)
  

• By defining the System.Net.Http.UseSocketsHttpHandler switch in the .netcore.runtimeconfig.json configuration file:

  "runtimeOptions": {
    "configProperties": {
        "System.Net.Http.UseSocketsHttpHandler": false
    }
  }
  

• By defining an environment variable named DOTNET_SYSTEM_NET_HTTP_USESOCKETSHTTPHANDLER and setting it to either false or 0.

These configuration options are not available starting with .NET 5.

Constructors

SocketsHttpHandler()

Creates an instance of a SocketsHttpHandler class.

Properties

ActivityHeadersPropagator	Gets or sets the DistributedContextPropagator to use when propagating the distributed trace and context. Use null to disable propagation. Defaults to Current.
AllowAutoRedirect	Gets or sets a value that indicates whether the handler should follow redirection responses.
AutomaticDecompression	Gets or sets the type of decompression method used by the handler for automatic decompression of the HTTP content response.
ConnectCallback	Gets or sets a custom callback used to open new connections.
ConnectTimeout	Gets or sets the timespan to wait before the connection establishing times out.
CookieContainer	Gets or sets the managed cookie container object.
Credentials	Gets or sets authentication information used by this handler.
DefaultProxyCredentials	When the default (system) proxy is used, gets or sets the credentials used to submit to the default proxy server for authentication.
EnableMultipleHttp2Connections	Gets or sets a value that indicates whether additional HTTP/2 connections can be established to the same server when the maximum number of concurrent streams is reached on all existing connections.
Expect100ContinueTimeout	Gets or sets the time-out value for server HTTP 100 Continue response.
InitialHttp2StreamWindowSize	Defines the initial HTTP2 stream receive window size for all connections opened by the this SocketsHttpHandler.
IsSupported	Gets a value that indicates whether the handler is supported on the current platform.
KeepAlivePingDelay	Gets or sets the keep alive ping delay.
KeepAlivePingPolicy	Gets or sets the keep alive ping behaviour.
KeepAlivePingTimeout	Gets or sets the keep alive ping timeout.
MaxAutomaticRedirections	Gets or sets the maximum number of allowed HTTP redirects.
MaxConnectionsPerServer	Gets or sets the maximum number of simultaneous TCP connections allowed to a single server.
MaxResponseDrainSize	Gets or sets the maximum amount of data that can be drained from responses in bytes.
MaxResponseHeadersLength	Gets or sets the maximum length, in kilobytes (1024 bytes), of the response headers.
PlaintextStreamFilter	Gets or sets a custom callback that provides access to the plaintext HTTP protocol stream.
PooledConnectionIdleTimeout	Gets or sets how long a connection can be idle in the pool to be considered reusable.
PooledConnectionLifetime	Gets or sets how long a connection can be in the pool to be considered reusable.
PreAuthenticate	Gets or sets a value that indicates whether the handler sends an Authorization header with the request.
Properties	Gets a writable dictionary (that is, a map) of custom properties for the HttpClient requests. The dictionary is initialized empty; you can insert and query key-value pairs for your custom handlers and special processing.
Proxy	Gets or sets the custom proxy when the UseProxy property is true.
RequestHeaderEncodingSelector	Gets or sets a callback that selects the Encoding to encode request header values.
ResponseDrainTimeout	Gets or sets the timespan to wait for data to be drained from responses.
ResponseHeaderEncodingSelector	Gets or sets a callback that selects the Encoding to decode response header values.
SslOptions	Gets or sets the set of options used for client TLS authentication.
UseCookies	Gets or sets a value that indicates whether the handler should use cookies.
UseProxy	Gets or sets a value that indicates whether the handler should use a proxy.

Methods

Dispose()	Releases the unmanaged resources and disposes of the managed resources used by the HttpMessageHandler. (Inherited from HttpMessageHandler)
Dispose(Boolean)	Releases the unmanaged resources used by the HttpMessageHandler and optionally disposes of the managed resources. (Inherited from HttpMessageHandler)
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetType()	Gets the Type of the current instance. (Inherited from Object)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
Send(HttpRequestMessage, CancellationToken)	When overridden in a derived class, sends an HTTP request with the specified request and cancellation token. Otherwise, throws a NotSupportedException. (Inherited from HttpMessageHandler)
SendAsync(HttpRequestMessage, CancellationToken)	Send an HTTP request as an asynchronous operation. (Inherited from HttpMessageHandler)
ToString()	Returns a string that represents the current object. (Inherited from Object)