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Showing content from https://github.com/dotnet/aspnetcore/issues/34124 below:

[Annoucement] ClientCertificate property no longer triggers renegotiation for HttpSys · Issue #34124 · dotnet/aspnetcore · GitHub

The HttpContext.Connection.ClientCertificate property will no longer trigger TLS renegotiations for HttpSys.

Version introduced

6.0

Old behavior

Setting HttpSysOptions.ClientCertificateMethod = ClientCertificateMethod.AllowRenegotation allowed renegotiation to be triggered by both HttpContext.Connection.ClientCertificate and HttpContext.Connection.GetClientCertifiateAsync.

See aspnet/Announcements#422 for related changes in 5.0.

New behavior

Setting HttpSysOptions.ClientCertificateMethod = ClientCertificateMethod.AllowRenegotation will allow renegotiation to be triggered only by HttpContext.Connection.GetClientCertifiateAsync. HttpContext.Connection.ClientCertificate will return the current certificate if available, but will not renegotiate with the client to request one.

Reason for change

When implementing the same features for Kestrel it became clear that applications needed to be able to check the state of the client certificate before triggering a renegotiation. This enables the following usage pattern to deal with issues like the request body conflicting with the renegotiation:

if (connection.ClientCertificate == null)
{
  await BufferRequestBodyAsync();
  await connection.GetClientCertificateAsync();
}

Recommended action

Applications that use delayed client certificate negotiation need to call GetClientCertificateAsync() to trigger that.