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Re: How to check if a website is up?

by nmcfarl (Pilgrim)
on Apr 05, 2004 at 04:14 UTC ( #342567=note: print w/replies, xml ) Need Help??

in reply to How to check if a website is up?

This simplest solution is LWP::Simple
use LWP::Simple; my $url=""; if (! head($url)) { die "The Server is DOWN!!!!" }
an alternative is using a get:
if (! get($url)) {
but that would fetch the content of the page. A head call uses the least resources, just telling you weather the machine is responding to that url.

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"Up" is an ill-defined concept
by pbeckingham (Parson) on Apr 05, 2004 at 19:42 UTC

    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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