in reply to How do I tell if a remote site is up?

Either ping it (using something like Net::Ping), or create a timeout wrapper around LWP: 
local $SIG{ALRM} = sub { die };
eval {
    alarm(10);
    # LWP request
    alarm(0);
};

[download]
-s.

Replies are listed 'Best First'.
Re: Re: How do I tell if a remote site is up?
by Elliott (Pilgrim) on Nov 11, 2003 at 18:21 UTC
    Sounds great - now what am I doing wrong?

    #!/usr/bin/perl
use LWP::Simple;

print "Content-type: text/html\n\n<html><body bgcolor=white>\n";

local $SIG{ALRM} = sub { die "alarm\n" }; # NB: \n required
eval {
    alarm 4;
    $content = get("http://select.worldpay.com/wcc/info?op=rates&instI
+d=36128");
    alarm 0;
};
    
if ($@) {
    die unless $@ eq "alarm\n";   # propagate unexpected errors
        # timed out
        print "timed out<BR>";
    }
    else {
        # didn't
        print "succeeded<BR>";
        
    } 
        
if($content) {
    print $content;
}
else {
    print "Durrr";
}

    [download]

    It's still hanging.

    I haven't really understood how to use SIGALARM - I am just coding-by-numbers at the moment hoping that understanding will dawn.

[reply]
[d/l]
      Ah.. I've tried it on a different server and it works perfectly. I wonder what the difference is.
[reply]

In Section Seekers of Perl Wisdom