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"Up" is an ill-defined concept

by pbeckingham (Parson)
on Apr 05, 2004 at 19:42 UTC ( #342721=note: print w/replies, xml ) Need Help??

in reply to Re: How to check if a website is up?
in thread How to check if a website is up?

There is a whole continuum of remote server "up" detection - from mere connectivity, through to accurate and timely responses. A machine may be in several states and conditions, and depending on quite what you are looking for, some of which can be:

  • single-user
  • multi-user
  • port 80 accepting
  • http://domain responding
  • http://domain/file responding
  • http://domain/file responding quickly enough
It may also be that the site content is unpredictable, so a specific URL may not be something you want to check.

Then there is a question of whether one of the unacceptable conditions might change if you retry. For example, instantaneous loads may indicate a very poor response time, but with a perfectly acceptable average.

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