Background: Trying to chase a bug where resources occasionally won't load. Only happens on mobile devices.
Last five columns in IIS logs are cs(User-Agent) sc-status sc-substatus sc-win32-status time-taken
What I don't understand is we have entries like:
{..user agent..} 590 0 0 15
If we map it, appears that some images return HTTP "590". Is there such a thing? I'm probably missing something here, any ideas?