Correct HTTP error code to return to iTunes on error?

Does iTunes support an HTTP error to return when the RSS feed is unavailable? We have an update window which we need to take the server down and report an error to anyone hitting the feed. I thought Error 503 - Service Unavailable would be appropriate, but anything I add iTunes just responds with the exclamation point of death.
Is there any correct way to do this?
  Mac OS X (10.4.5)  

Be proactive: go on the offensive. For example, the famous Mykonos web security software chooses to:
Warn the attacker
Block the user
Force a CAPTCHA
Slow the connection
Simulate a broken application
Force log-out

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