Nagios4 check_http -I vs -H

`--> /usr/local/nagios/libexec/check_http -I ghs64reunion.org -v | head -20
GET / HTTP/1.0
User-Agent: check_http/v2.0 (nagios-plugins 2.0)
Connection: close


http://ghs64reunion.org:80/ is 481 characters
STATUS: HTTP/1.1 404 Not Found
**** HEADER ****
Date: Wed, 08 Jul 2015 00:59:48 GMT
Server: Apache
Content-Length: 317
Connection: close
Content-Type: text/html; charset=iso-8859-1
**** CONTENT ****
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>404 Not Found</title>
</head><body>
<h1>Not Found</h1>
<p>The requested URL / was not found on this server.</p>

`--> /usr/local/nagios/libexec/check_http -H ghs64reunion.org -v | head -20
GET / HTTP/1.1
User-Agent: check_http/v2.0 (nagios-plugins 2.0)
Connection: close
Host: ghs64reunion.org


http://ghs64reunion.org:80/ is 46455 characters
STATUS: HTTP/1.1 200 OK
**** HEADER ****
Date: Wed, 08 Jul 2015 01:00:03 GMT
Server: Apache
X-Powered-By: PHP/5.5.26
X-Pingback: http://ghs64reunion.org/xmlrpc.php
Connection: close
Transfer-Encoding: chunked
Content-Type: text/html; charset=UTF-8
**** CONTENT ****
2f
<!DOCTYPE html>
<!--[if IE 6]> <html id="ie6"