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WebRequest.xml
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WebRequest.xml
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<Type Name="WebRequest" FullName="System.Net.WebRequest">
<TypeSignature Language="C#" Value="public abstract class WebRequest" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi abstract beforefieldinit WebRequest extends System.Object" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1" />
<TypeSignature Language="DocId" Value="T:System.Net.WebRequest" />
<TypeSignature Language="VB.NET" Value="Public MustInherit Class WebRequest" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1" />
<TypeSignature Language="F#" Value="type WebRequest = class" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1" />
<TypeSignature Language="C++ CLI" Value="public ref class WebRequest abstract" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1" />
<TypeSignature Language="C#" Value="public abstract class WebRequest : MarshalByRefObject, System.Runtime.Serialization.ISerializable" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi abstract beforefieldinit WebRequest extends System.MarshalByRefObject implements class System.Runtime.Serialization.ISerializable" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="VB.NET" Value="Public MustInherit Class WebRequest
Inherits MarshalByRefObject
Implements ISerializable" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="F#" Value="type WebRequest = class
 inherit MarshalByRefObject
 interface ISerializable" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="C++ CLI" Value="public ref class WebRequest abstract : MarshalByRefObject, System::Runtime::Serialization::ISerializable" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi abstract serializable beforefieldinit WebRequest extends System.MarshalByRefObject implements class System.Runtime.Serialization.ISerializable" FrameworkAlternate="netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
<AssemblyInfo>
<AssemblyName>System.Net.Requests</AssemblyName>
<AssemblyVersion>4.0.10.0</AssemblyVersion>
<AssemblyVersion>4.1.0.0</AssemblyVersion>
<AssemblyVersion>4.1.1.0</AssemblyVersion>
<AssemblyVersion>4.1.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Net</AssemblyName>
</AssemblyInfo>
<TypeForwardingChain>
<TypeForwarding From="System" FromVersion="4.0.0.0" To="System.Net.Requests" ToVersion="0.0.0.0" FrameworkAlternate="dotnet-uwp-10.0" />
<TypeForwarding From="System.Net" FromVersion="4.0.0.0" To="System.Net.Requests" ToVersion="0.0.0.0" FrameworkAlternate="dotnet-uwp-10.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Net.Requests" ToVersion="5.0.0.0" FrameworkAlternate="net-5.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Net.Requests" ToVersion="6.0.0.0" FrameworkAlternate="net-6.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Net.Requests" ToVersion="7.0.0.0" FrameworkAlternate="net-7.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Net.Requests" ToVersion="8.0.0.0" FrameworkAlternate="net-8.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Net.Requests" ToVersion="9.0.0.0" FrameworkAlternate="net-9.0" />
<TypeForwarding From="System.Net" FromVersion="4.0.0.0" To="System" ToVersion="4.0.0.0" FrameworkAlternate="netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
</TypeForwardingChain>
<Base>
<BaseTypeName>System.Object</BaseTypeName>
<BaseTypeName FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">System.MarshalByRefObject</BaseTypeName>
</Base>
<Interfaces>
<Interface FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
<InterfaceName>System.Runtime.Serialization.ISerializable</InterfaceName>
</Interface>
</Interfaces>
<Attributes>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(0)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.Nullable(0)>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.NullableContext(1)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.NullableContext(1)>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1">
<AttributeName Language="C#">[System.Serializable]</AttributeName>
<AttributeName Language="F#">[<System.Serializable>]</AttributeName>
</Attribute>
</Attributes>
<Docs>
<summary>Makes a request to a Uniform Resource Identifier (URI). This is an <see langword="abstract" /> class.</summary>
<remarks>
<format type="text/markdown"><]
<xref:System.Net.WebRequest> is the `abstract` base class for .NET's request/response model for accessing data from the Internet. An application that uses the request/response model can request data from the Internet in a protocol-agnostic manner, in which the application works with instances of the <xref:System.Net.WebRequest> class while protocol-specific descendant classes carry out the details of the request.
Requests are sent from an application to a particular URI, such as a Web page on a server. The URI determines the proper descendant class to create from a list of <xref:System.Net.WebRequest> descendants registered for the application. <xref:System.Net.WebRequest> descendants are typically registered to handle a specific protocol, such as HTTP or FTP, but can be registered to handle a request to a specific server or path on a server.
The <xref:System.Net.WebRequest> class throws a <xref:System.Net.WebException> when errors occur while accessing an Internet resource. The <xref:System.Net.WebException.Status%2A> property is one of the <xref:System.Net.WebExceptionStatus> values that indicates the source of the error. When <xref:System.Net.WebException.Status%2A> is <xref:System.Net.WebExceptionStatus.ProtocolError?displayProperty=nameWithType>, the <xref:System.Net.WebException.Response%2A> property contains the <xref:System.Net.WebResponse> received from the Internet resource.
Because the <xref:System.Net.WebRequest> class is an `abstract` class, the actual behavior of <xref:System.Net.WebRequest> instances at run time is determined by the descendant class returned by <xref:System.Net.WebRequest.Create%2A> method. For more information about default values and exceptions, see the documentation for the descendant classes, such as <xref:System.Net.HttpWebRequest> and <xref:System.Net.FileWebRequest>.
> [!NOTE]
> Use the <xref:System.Net.WebRequest.Create%2A> method to initialize new <xref:System.Net.WebRequest> instances. Do not use the <xref:System.Net.WebRequest> constructor.
> [!NOTE]
> If the application that creates the WebRequest object runs with the credentials of a Normal user, the application will not be able to access certificates installed in the local machine store unless permission has been explicitly given to the user to do so.
## Examples
The following example shows how to create a <xref:System.Net.WebRequest> instance and return the response.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_Remoting/NCLWebRequestSimple/CPP/webrequestget.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System.Net/WebRequest/Overview/webrequestget.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Remoting/NCLWebRequestSimple/VB/webrequestget.vb" id="Snippet1":::
]]></format>
</remarks>
<block subset="none" type="overrides">
<para>When you inherit from <see cref="T:System.Net.WebRequest" />, you must override the following members: <see cref="P:System.Net.WebRequest.Method" />, <see cref="P:System.Net.WebRequest.RequestUri" />, <see cref="P:System.Net.WebRequest.Headers" />, <see cref="P:System.Net.WebRequest.ContentLength" />, <see cref="P:System.Net.WebRequest.ContentType" />, <see cref="P:System.Net.WebRequest.Credentials" />, <see cref="P:System.Net.WebRequest.PreAuthenticate" />, <see cref="M:System.Net.WebRequest.GetRequestStream" />, <see cref="M:System.Net.WebRequest.BeginGetRequestStream(System.AsyncCallback,System.Object)" />, <see cref="M:System.Net.WebRequest.EndGetRequestStream(System.IAsyncResult)" />, <see cref="M:System.Net.WebRequest.GetResponse" />, <see cref="M:System.Net.WebRequest.BeginGetResponse(System.AsyncCallback,System.Object)" />, and <see cref="M:System.Net.WebRequest.EndGetResponse(System.IAsyncResult)" />. In addition, you must provide an implementation of the <see cref="T:System.Net.IWebRequestCreate" /> interface, which defines the <see cref="M:System.Net.IWebRequestCreate.Create(System.Uri)" /> method used when you call <see cref="M:System.Net.WebRequest.Create(System.Uri)" />. You must register the class that implements the <see cref="T:System.Net.IWebRequestCreate" /> interface, using the <see cref="M:System.Net.WebRequest.RegisterPrefix(System.String,System.Net.IWebRequestCreate)" /> method or the configuration file.</para>
</block>
<altmember cref="T:System.Net.HttpWebRequest" />
<related type="Article" href="/dotnet/framework/network-programming/requesting-data">Requesting Data</related>
<related type="Article" href="/dotnet/framework/network-programming/programming-pluggable-protocols">Programming Pluggable Protocols</related>
</Docs>
<Members>
<MemberGroup MemberName=".ctor">
<AssemblyInfo>
<AssemblyName>System.Net.Requests</AssemblyName>
<AssemblyVersion>4.0.10.0</AssemblyVersion>
<AssemblyVersion>4.1.0.0</AssemblyVersion>
</AssemblyInfo>
<Docs>
<summary>Initializes a new instance of the <see cref="T:System.Net.WebRequest" /> class.</summary>
</Docs>
</MemberGroup>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="protected WebRequest ();" />
<MemberSignature Language="ILAsm" Value=".method familyhidebysig specialname rtspecialname instance void .ctor() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Net.WebRequest.#ctor" />
<MemberSignature Language="VB.NET" Value="Protected Sub New ()" />
<MemberSignature Language="C++ CLI" Value="protected:
 WebRequest();" />
<MemberType>Constructor</MemberType>
<AssemblyInfo>
<AssemblyName>System.Net.Requests</AssemblyName>
<AssemblyVersion>4.0.10.0</AssemblyVersion>
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<AttributeName Language="C#">[System.Obsolete("WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete. Use HttpClient instead.", DiagnosticId="SYSLIB0014", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]</AttributeName>
<AttributeName Language="F#">[<System.Obsolete("WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete. Use HttpClient instead.", DiagnosticId="SYSLIB0014", UrlFormat="https://aka.ms/dotnet-warnings/{0}")>]</AttributeName>
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<Docs>
<summary>Initializes a new instance of the <see cref="T:System.Net.WebRequest" /> class.</summary>
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<format type="text/markdown"><![CDATA[
## Remarks
Use the <xref:System.Net.WebRequest.Create%2A> method to initialize new <xref:System.Net.WebRequest> instances. Do not use the constructor.
## Examples
The following example shows how to create a <xref:System.Net.WebRequest> instance by calling the <xref:System.Net.WebRequest.Create%2A> method on the <xref:System.Net.WebRequest> class.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_Remoting/Classic WebRequest.WebRequest Example/CPP/source.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System.Net/WebRequest/.ctor/source.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Remoting/Classic WebRequest.WebRequest Example/VB/source.vb" id="Snippet1":::
]]></format>
</remarks>
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<Parameters>
<Parameter Name="serializationInfo" Type="System.Runtime.Serialization.SerializationInfo" Index="0" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
<Parameter Name="streamingContext" Type="System.Runtime.Serialization.StreamingContext" Index="1" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netstandard-2.0;netstandard-2.1;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
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<Docs>
<param name="serializationInfo">The information required to serialize the new <see cref="T:System.Net.WebRequest" /> instance.</param>
<param name="streamingContext">A <see cref="T:System.Runtime.Serialization.StreamingContext" /> that indicates the source of the serialized stream associated with the new <see cref="T:System.Net.WebRequest" /> instance.</param>
<summary>Initializes a new instance of the <see cref="T:System.Net.WebRequest" /> class from the specified instances of the <see cref="T:System.Runtime.Serialization.SerializationInfo" /> and <see cref="T:System.Runtime.Serialization.StreamingContext" /> classes.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
When implemented by a descendant class, this constructor implements the <xref:System.Runtime.Serialization.ISerializable> interface for the <xref:System.Net.WebRequest> descendant.
> [!NOTE]
> An application must run in full trust mode when using serialization.
]]></format>
</remarks>
<exception cref="T:System.NotImplementedException">Any attempt is made to access the constructor, when the constructor is not overridden in a descendant class.</exception>
<related type="Article" href="/dotnet/standard/serialization/xml-and-soap-serialization">XML and SOAP Serialization</related>
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<Member MemberName="Abort">
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<summary>Aborts the request.</summary>
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<format type="text/markdown"><]
The <xref:System.Net.WebRequest.Abort%2A> method cancels asynchronous requests to Internet resources started with the <xref:System.Net.WebRequest.BeginGetResponse%2A> method.
> [!NOTE]
> The <xref:System.Net.WebRequest> class is an `abstract` class. The actual behavior of <xref:System.Net.WebRequest> instances at run time is determined by the descendant class returned by the <xref:System.Net.WebRequest.Create%2A?displayProperty=nameWithType> method. For more information about default values and exceptions, see the documentation for the descendant classes, such as <xref:System.Net.HttpWebRequest> and <xref:System.Net.FileWebRequest>.
]]></format>
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<exception cref="T:System.NotImplementedException">Any attempt is made to access the method, when the method is not overridden in a descendant class.</exception>
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 property System::Net::Security::AuthenticationLevel AuthenticationLevel { System::Net::Security::AuthenticationLevel get(); void set(System::Net::Security::AuthenticationLevel value); };" />
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<Attribute FrameworkAlternate="netframework-4.0">
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<ReturnType>System.Net.Security.AuthenticationLevel</ReturnType>
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<summary>Gets or sets values indicating the level of authentication and impersonation used for this request.</summary>
<value>A bitwise combination of the <see cref="T:System.Net.Security.AuthenticationLevel" /> values. The default value is <see cref="F:System.Net.Security.AuthenticationLevel.MutualAuthRequested" />.
In mutual authentication, both the client and server present credentials to establish their identity. The <see cref="F:System.Net.Security.AuthenticationLevel.MutualAuthRequired" /> and <see cref="F:System.Net.Security.AuthenticationLevel.MutualAuthRequested" /> values are relevant for Kerberos authentication. Kerberos authentication can be supported directly, or can be used if the Negotiate security protocol is used to select the actual security protocol. For more information about authentication protocols, see <see href="/dotnet/framework/network-programming/internet-authentication">Internet Authentication</see>.
To determine whether mutual authentication occurred, check the <see cref="P:System.Net.WebResponse.IsMutuallyAuthenticated" /> property.
If you specify the <see cref="F:System.Net.Security.AuthenticationLevel.MutualAuthRequired" /> authentication flag value and mutual authentication does not occur, your application will receive an <see cref="T:System.IO.IOException" /> with a <see cref="T:System.Net.ProtocolViolationException" /> inner exception indicating that mutual authentication failed.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Examples
The following code example sets the value of this property.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_Remoting/NCLCredPolicy/CPP/NCLCredPolicy.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/Microsoft.Win32/IntranetZoneCredentialPolicy/Overview/websample.cs" id="Snippet1":::
]]></format>
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<ReturnValue>
<ReturnType>System.IAsyncResult</ReturnType>
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<Parameter Name="state" Type="System.Object" />
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<Docs>
<param name="callback">The <see cref="T:System.AsyncCallback" /> delegate.</param>
<param name="state">An object containing state information for this asynchronous request.</param>
<summary>When overridden in a descendant class, provides an asynchronous version of the <see cref="M:System.Net.WebRequest.GetRequestStream" /> method.</summary>
<returns>An <see cref="T:System.IAsyncResult" /> that references the asynchronous request.</returns>
<remarks>
<format type="text/markdown"><]
The <xref:System.Net.WebRequest.BeginGetRequestStream%2A> method starts an asynchronous request for a stream used to send data to an Internet resource. The callback method that implements the <xref:System.AsyncCallback> delegate uses the <xref:System.Net.WebRequest.EndGetRequestStream%2A> method to return the request stream.
> [!NOTE]
> The <xref:System.Net.WebRequest> class is an `abstract` class. The actual behavior of <xref:System.Net.WebRequest> instances at run time is determined by the descendant class returned by the <xref:System.Net.WebRequest.Create%2A?displayProperty=nameWithType> method. For more information about default values and exceptions, see the documentation for the descendant classes, such as <xref:System.Net.HttpWebRequest> and <xref:System.Net.FileWebRequest>.
## Examples
The following example uses the <xref:System.Net.WebRequest.BeginGetRequestStream%2A> to asynchronously obtain the request stream.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_Remoting/WebRequest_BeginGetRequest/CPP/webrequest_begingetrequest.cpp" id="Snippet3":::
:::code language="csharp" source="~/snippets/csharp/System.Net/WebRequest/BeginGetRequestStream/webrequest_begingetrequest.cs" id="Snippet3":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Remoting/WebRequest_BeginGetRequest/VB/webrequest_begingetrequest.vb" id="Snippet3":::
]]></format>
</remarks>
<exception cref="T:System.NotImplementedException">Any attempt is made to access the method, when the method is not overridden in a descendant class.</exception>
<altmember cref="M:System.Net.WebRequest.EndGetRequestStream(System.IAsyncResult)" />
<related type="Article" href="/dotnet/framework/network-programming/making-asynchronous-requests">Making Asynchronous Requests</related>
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<Docs>
<param name="callback">The <see cref="T:System.AsyncCallback" /> delegate.</param>
<param name="state">An object containing state information for this asynchronous request.</param>
<summary>When overridden in a descendant class, begins an asynchronous request for an Internet resource.</summary>
<returns>An <see cref="T:System.IAsyncResult" /> that references the asynchronous request.</returns>
<remarks>
<format type="text/markdown"><]
The <xref:System.Net.WebRequest.BeginGetResponse%2A> method starts an asynchronous request for a response. The callback method that implements the <xref:System.AsyncCallback> delegate uses the <xref:System.Net.WebRequest.EndGetResponse%2A> method to return the <xref:System.Net.WebResponse> from the Internet resource.
> [!NOTE]
> The <xref:System.Net.WebRequest> class is an `abstract` class. The actual behavior of <xref:System.Net.WebRequest> instances at run time is determined by the descendant class returned by the <xref:System.Net.WebRequest.Create%2A?displayProperty=nameWithType> method. For more information about default values and exceptions, see the documentation for the descendant classes, such as <xref:System.Net.HttpWebRequest> and <xref:System.Net.FileWebRequest>.
> [!NOTE]
> If a WebException is thrown, use the <xref:System.Net.WebException.Response%2A> and <xref:System.Net.WebException.Status%2A> properties of the exception to determine the response from the server.
## Examples
The following example uses <xref:System.Net.WebRequest.BeginGetResponse%2A> to asynchronously request the target resource. When the resource has been obtained, the specified callback method will be executed.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_Remoting/WebRequest_BeginGetResponse/CPP/webrequest_begingetresponse.cpp" id="Snippet2":::
:::code language="csharp" source="~/snippets/csharp/System.Net/WebRequest/BeginGetResponse/webrequest_begingetresponse.cs" id="Snippet2":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Remoting/WebRequest_BeginGetResponse/VB/webrequest_begingetresponse.vb" id="Snippet2":::
]]></format>
</remarks>
<exception cref="T:System.NotImplementedException">Any attempt is made to access the method, when the method is not overridden in a descendant class.</exception>
<altmember cref="M:System.Net.WebRequest.EndGetResponse(System.IAsyncResult)" />
<altmember cref="M:System.Net.WebRequest.GetResponse" />
<related type="Article" href="/dotnet/framework/network-programming/making-asynchronous-requests">Making Asynchronous Requests</related>
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<Docs>
<summary>Gets or sets the cache policy for this request.</summary>
<value>A <see cref="T:System.Net.Cache.RequestCachePolicy" /> object that defines a cache policy.</value>
<remarks>
<format type="text/markdown"><]
The current cache policy and the presence of the requested resource in the cache determine whether a response can be retrieved from the cache. Using cached responses usually improves application performance, but there is a risk that the response in the cache does not match the response on the server.
Default cache policy can be specified in the Machine.config configuration file or by setting the <xref:System.Net.HttpWebRequest.DefaultCachePolicy%2A> property for requests that use the Hypertext Transfer Protocol (HTTP) or Secure Hypertext Transfer Protocol (HTTPS) URI scheme.
A copy of a resource is only added to the cache if the response stream for the resource is retrieved and read to the end of the stream. So another request for the same resource could use a cached copy, depending on the cache policy level for this request.
## Examples
The following code example demonstrates setting the cache policy for a Web request.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_Remoting/NCLSimpleCache/CPP/NCLSimpleCache.cpp" id="Snippet2":::
:::code language="csharp" source="~/snippets/csharp/System.Net/WebRequest/CachePolicy/example.cs" id="Snippet2":::
]]></format>
</remarks>
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<altmember cref="P:System.Net.WebRequest.DefaultCachePolicy" />
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<summary>When overridden in a descendant class, gets or sets the name of the connection group for the request.</summary>
<value>The name of the connection group for the request.</value>
<remarks>
<format type="text/markdown"><]
The <xref:System.Net.WebRequest.ConnectionGroupName%2A> property associates specific requests within an application to one or more connection pools.
> [!NOTE]
> The <xref:System.Net.WebRequest> class is an `abstract` class. The actual behavior of <xref:System.Net.WebRequest> instances at run time is determined by the descendant class returned by the <xref:System.Net.WebRequest.Create%2A?displayProperty=nameWithType> method. For more information about default values and exceptions, see the documentation for the descendant classes, such as <xref:System.Net.HttpWebRequest> and <xref:System.Net.FileWebRequest>.
]]></format>
</remarks>
<exception cref="T:System.NotImplementedException">Any attempt is made to get or set the property, when the property is not overridden in a descendant class.</exception>
<block subset="none" type="overrides">
<para>The <see cref="P:System.Net.WebRequest.ConnectionGroupName" /> property typically associates a group of requests that share a set of credentials with a connection to an Internet resource to avoid potential security failures.</para>
</block>
<altmember cref="P:System.Net.Configuration.ConnectionManagementElement.MaxConnection" />
<altmember cref="P:System.Net.HttpWebRequest.ConnectionGroupName" />
<related type="Article" href="/dotnet/framework/network-programming/connection-grouping">Connection Grouping</related>
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<summary>When overridden in a descendant class, gets or sets the content length of the request data being sent.</summary>
<value>The number of bytes of request data being sent.</value>
<remarks>
<format type="text/markdown"><]
The <xref:System.Net.WebRequest.ContentLength%2A> property contains the number of bytes of data sent to the Internet resource by the <xref:System.Net.WebRequest> instance.
> [!NOTE]
> The <xref:System.Net.WebRequest> class is an `abstract` class. The actual behavior of <xref:System.Net.WebRequest> instances at run time is determined by the descendant class returned by the <xref:System.Net.WebRequest.Create%2A?displayProperty=nameWithType> method. For more information about default values and exceptions, see the documentation for the descendant classes, such as <xref:System.Net.HttpWebRequest> and <xref:System.Net.FileWebRequest>.
## Examples
The following example sets the <xref:System.Net.WebRequest.ContentLength%2A> property to the amount of bytes in the outgoing byte buffer.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_Remoting/WebRequest_ContentType/CPP/webrequest_contenttype.cpp" id="Snippet4":::
:::code language="csharp" source="~/snippets/csharp/System.Net/WebRequest/ContentLength/webrequest_contenttype.cs" id="Snippet4":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Remoting/WebRequest_ContentType/VB/webrequest_contenttype.vb" id="Snippet4":::
]]></format>
</remarks>
<exception cref="T:System.NotImplementedException">Any attempt is made to get or set the property, when the property is not overridden in a descendant class.</exception>
<altmember cref="P:System.Net.HttpWebRequest.ContentLength" />
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 virtual property System::String ^ ContentType { System::String ^ get(); void set(System::String ^ value); };" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
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<summary>When overridden in a descendant class, gets or sets the content type of the request data being sent.</summary>
<value>The content type of the request data.</value>
<remarks>
<format type="text/markdown"><]
The <xref:System.Net.WebRequest.ContentType%2A> property contains the media type of the request. This is typically the MIME encoding of the content.
> [!NOTE]
> The <xref:System.Net.WebRequest> class is an `abstract` class. The actual behavior of <xref:System.Net.WebRequest> instances at run time is determined by the descendant class returned by the <xref:System.Net.WebRequest.Create%2A?displayProperty=nameWithType> method. For more information about default values and exceptions, see the documentation for the descendant classes, such as <xref:System.Net.HttpWebRequest> and <xref:System.Net.FileWebRequest>.
## Examples
The following example sets the <xref:System.Net.WebRequest.ContentType%2A> property to the appropriate media type.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_Remoting/WebRequest_ContentType/CPP/webrequest_contenttype.cpp" id="Snippet4":::
:::code language="csharp" source="~/snippets/csharp/System.Net/WebRequest/ContentLength/webrequest_contenttype.cs" id="Snippet4":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Remoting/WebRequest_ContentType/VB/webrequest_contenttype.vb" id="Snippet4":::
]]></format>
</remarks>
<exception cref="T:System.NotImplementedException">Any attempt is made to get or set the property, when the property is not overridden in a descendant class.</exception>
<altmember cref="P:System.Net.HttpWebRequest.ContentType" />
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<summary>Initializes a new <see cref="T:System.Net.WebRequest" />.</summary>
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<ReturnType>System.Net.WebRequest</ReturnType>
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<Parameter Name="requestUriString" Type="System.String" />
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<Docs>
<param name="requestUriString">The URI that identifies the Internet resource.</param>
<summary>Initializes a new <see cref="T:System.Net.WebRequest" /> instance for the specified URI scheme.</summary>
<returns>A <see cref="T:System.Net.WebRequest" /> descendant for the specific URI scheme.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Net.WebRequest.Create%2A> method returns a descendant of the <xref:System.Net.WebRequest> class determined at run time as the closest registered match for `requestUri`.
For example, when a URI beginning with `http://` or `https://` is passed in `requestUri`, an <xref:System.Net.HttpWebRequest> is returned by <xref:System.Net.WebRequest.Create%2A>. If a URI beginning with `ftp://` is passed instead, the <xref:System.Net.WebRequest.Create%2A> method will return a <xref:System.Net.FtpWebRequest> instance. If a URI beginning with `file://` is passed instead, the <xref:System.Net.WebRequest.Create%2A> method will return a <xref:System.Net.FileWebRequest> instance.
The pre-registered reserve types already registered include the following:
- `http://`
- `https://`
- `ftp://`
- `file://`
.NET includes support for the `http://`, `https://`, `ftp://`, and `file://` URI schemes. Custom <xref:System.Net.WebRequest> descendants to handle other requests are registered with the <xref:System.Net.WebRequest.RegisterPrefix%2A> method.
The <xref:System.Net.WebRequest.Create%2A> method uses the `requestUriString` parameter to create a <xref:System.Uri> instance that it passes to the new <xref:System.Net.WebRequest>.
> [!NOTE]
> This member outputs trace information when you enable network tracing in your application. For more information, see [Network Tracing in the .NET Framework](/dotnet/framework/network-programming/network-tracing).
## Examples
The following example uses <xref:System.Net.WebRequest.Create%2A> to instantiate an <xref:System.Net.HttpWebRequest> instance. A string representing the target URL is used as the constructor parameter.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_Remoting/WebResponse_ResponseUri/CPP/webresponse_responseuri.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System.Net/WebRequest/Create/webresponse_responseuri.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Remoting/WebResponse_ResponseUri/VB/webresponse_responseuri.vb" id="Snippet1":::
]]></format>
</remarks>
<exception cref="T:System.NotSupportedException">The request scheme specified in <paramref name="requestUriString" /> has not been registered.</exception>
<exception cref="T:System.ArgumentNullException">
<paramref name="requestUriString" /> is <see langword="null" />.</exception>
<exception cref="T:System.Security.SecurityException">The caller does not have <see cref="T:System.Net.WebPermissionAttribute" /> permission to connect to the requested URI or a URI that the request is redirected to.</exception>
<exception cref="T:System.UriFormatException">The URI specified in <paramref name="requestUriString" /> is not a valid URI.
Note: In <see href="https://go.microsoft.com/fwlink/?LinkID=247912">.NET for Windows Store apps</see> or the <see href="https://learn.microsoft.com/dotnet/standard/cross-platform/cross-platform-development-with-the-portable-class-library">Portable Class Library</see>, catch the base class exception, <see cref="T:System.FormatException" />, instead.
</exception>
<related type="Article" href="/dotnet/framework/network-programming/programming-pluggable-protocols">Programming Pluggable Protocols</related>
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