netcoreapp3.1 
namespace Microsoft.AspNetCore.Builder
{
    public static class ConnectionsAppBuilderExtensions
    {
        [Obsolete("This method is obsolete and will be removed in a future version. The recommended alternative is to use MapConnections or MapConnectionHandler<TConnectionHandler> inside Microsoft.AspNetCore.Builder.UseEndpoints(...).")]
        public static IApplicationBuilder UseConnections(this IApplicationBuilder app, Action<ConnectionsRouteBuilder> configure);
    }
}
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Reference this API
.NET Core
3.03.1
Information specific to netcoreapp3.1
Assembly

Microsoft.AspNetCore.Http.Connections , Version=3.1.0.0, PublicKeyToken=adb9793829ddae60

Referencing

Requires any:

  • Your project needs to use SDK Microsoft.NET.Sdk.Web.

  • Your project needs a framework reference to Microsoft.AspNetCore.App.

Obsolete This method is obsolete and will be removed in a future version. The recommended alternative is to use MapConnections or MapConnectionHandler<TConnectionHandler> inside Microsoft.AspNetCore.Builder.UseEndpoints(...).
Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API