What happened to my check_http all of the sudden?

[Morris, Patrick]

> From: steve f [mailto:a31modela at hotmail.com]
> Sent: Thursday, November 03, 2011 11:34 AM
> Subject: [Nagios-users] What happened to my check_http all of the sudden?

> The check was check_http -L www.somesite.com -c 30 -w 15, which was running 
> with no problem. Today we switched over
> content to Akamai and as soon as we did, this check starting alerting a 
> warning as follows :
> <A HREF="http://www.somesite.com:80/" target="_blank">HTTP WARNING: HTTP/1.0 
> 400
> Bad Request - 402 bytes in 0.061 second response time 
> </A>|time=0.061278s;15.000
> 000;30.000000;0.000000 size=402B;;;0

> I switched the check to the following check_http -H www.somesite.com -c 
> 30 -w 15
> and everything went back to green
> HTTP OK: HTTP/1.1 200 OK - 40004 bytes in 0.247 second response time 
> |time=0.246
> 539s;15.000000;30.000000;0.000000 size=40004B;;;0

-H and -L are not even remotely related to each other. -H is followed by the 
hostname you're checking and specifies a virtual hostname to check. It is used 
to generate the "Host" header in the HTTP request, and in the absence of a 
"-I" parameter it is also used to determine the address to send your request 
to.

-L is a standalone parameter.  In your original config, -L and 
"www.somesite.com" have no relationship to each other, becaus -L does not take 
a parameter.  It is used to wrap your URL in HTML to make it a clickable link 
in your plugin output. It is a strictly cosmetic option that does not affect 
how your check is run in any way.

Since you had not included a hostname to check in your configuration, your 
HTTP requests probably never had a valid "Host" header, and Akamai barfed on 
those requests in a way your local server did not.

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