check_http and time to first byte (#1346)

[jeffadams]

I'd like the ability to alert on time to first byte. I've worked with more
than one heavy weight application where TTFB was the most reliable way to
know if the app was up. I understand that this use case might be relatively
limited, but it could be very useful in these cases. 

A patch for this looks pretty simple. I'll be glad to submit it if there's
interest.  

-- 
Reply to this email on GitHub:
https://github.com/monitoring-plugins/monitoring-plugins/issues/1346
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