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SYSLIB0014 warning
Learn about the System.Net obsoletions that generate compile-time warning SYSLIB0014.
04/24/2021
syslib0014

SYSLIB0014: WebRequest, HttpWebRequest, ServicePoint, WebClient are obsolete

The following APIs are marked as obsolete, starting in .NET 6. Using them in code generates warning SYSLIB0014 at compile time.

  • xref:System.Net.WebRequest.%23ctor
  • xref:System.Net.WebRequest.Create%2A?displayProperty=fullName
  • xref:System.Net.WebRequest.CreateHttp%2A?displayProperty=fullName
  • xref:System.Net.WebRequest.CreateDefault(System.Uri)?displayProperty=fullName
  • xref:System.Net.HttpWebRequest.%23ctor(System.Runtime.Serialization.SerializationInfo,System.Runtime.Serialization.StreamingContext)
  • xref:System.Net.ServicePointManager
  • xref:System.Net.WebClient.%23ctor

To reduce the number of analyzer warnings, the xref:System.Net.ServicePoint class is not marked as obsolete, but all ways of obtaining its instances are.

Settings on xref:System.Net.ServicePointManager and xref:System.Net.ServicePoint no longer affect xref:System.Net.Security.SslStream or xref:System.Net.Http.HttpClient.

Workarounds

Use xref:System.Net.Http.HttpClient instead.

See the HttpWebRequest to HttpClient migration guide for more info.

Suppress a warning

If you must use the obsolete APIs, you can suppress the warning in code or in your project file.

To suppress only a single violation, add preprocessor directives to your source file to disable and then re-enable the warning.

// Disable the warning.
#pragma warning disable SYSLIB0014

// Code that uses obsolete API.
// ...

// Re-enable the warning.
#pragma warning restore SYSLIB0014

To suppress all the SYSLIB0014 warnings in your project, add a <NoWarn> property to your project file.

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
   ...
   <NoWarn>$(NoWarn);SYSLIB0014</NoWarn>
  </PropertyGroup>
</Project>

For more information, see Suppress warnings.

See also