[Nagiosplug-devel] Feature request: check_http follow relative HTTP redirects

Andrew Pollock andrew-netsaint at andrew.net.au
Sat Aug 3 04:52:01 CEST 2002


I made a feature request on the SourceForge website and was asked to elaborate
on this list, so here I am.

I'd like the check_http plugin to be able to handle HTTP redirects that aren't
absolute. I'm not sure that they're strictly legal, but they are out there, and
there's one particular host that I want to monitor with this plugin that's
giving me grief.


caesar:/usr/local/bin# nc webserver 80
GET / HTTP/1.0

HTTP/1.1 302 Object moved
Server: Microsoft-IIS/5.0
Date: Sat, 03 Aug 2002 11:42:33 GMT
Location: home/p_home.asp
Connection: Keep-Alive
Content-Length: 136
Content-Type: text/html
Cache-control: private

<head><title>Object moved</title></head>
<body><h1>Object Moved</h1>This object may be found <a

Notice the lack of a leading forwardslash.

Using the -f option of check_http to follow the redirect results in a

HTTP WARNING: HTTP/1.1 400 Bad Request

because check_http is doing a 

GET home/p_home.asp HTTP/1.0

Arguably the redirect itself is being done incorrectly, but the fact is, the two
main web browsers can handle it, so I don't see how I'm going to be able to
convince the powers that be to rework their website just so my monitoring works

So consider this my elaboration on request 577235


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