Updating HubProtocol spec to account for using VarInt to encode length prefix
Updating HubProtocol spec to account for using VarInt to encode length prefix

aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore