HTTP-based GSS-Negotiate authentication, as defined by RFC 4559
.
[class@Session]s do not support this type by default; if you want to enable support for it, call [method@Session.add_feature_by_type],
passing soup_type_auth_negotiate.
This auth type will only work if libsoup was compiled with GSSAPI support; you can check [func@AuthNegotiate.supported] to see if it was.