ASP.NET Request using connection transport capable of "inherent keep-alive"

• 1 - Can inform the client whether connection is still active.
• 0 = inherent keep-alive not available.

The most common example of this feature is the Long Polling HTTP transport

Platforms Supported: Limited (Only supported in Asp.NetCore)

Introduced with NLog.Web.AspNetCore v5.1.0

${aspnet-request-inherent-keep-alive}