<p>This seems to work with the lastest stable release (1.5):</p>

<p>$ /usr/lib/nagios/plugins/check_http -I 127.0.0.1 -p 8888 -H 'domain.org:80' -v | head -4<br>
GET / HTTP/1.1<br>
User-Agent: check_http/v1.5 (nagios-plugins 1.5)<br>
Connection: close<br>
Host: domain.org:80</p>

<p>So I'm closing this issue.</p>

<p style="font-size:small;-webkit-text-size-adjust:none;color:#666;">—<br><a href="https://github.com/monitoring-plugins/monitoring-plugins/issues/1026#issuecomment-46850782">Reply to this email on GitHub</a>.<img alt="" height="1" src="https://github.com/notifications/beacon/5514713__eyJzY29wZSI6Ik5ld3NpZXM6QmVhY29uIiwiZXhwaXJlcyI6MTcxOTE1MjM2NywiZGF0YSI6eyJpZCI6MTcyNzc5NTd9fQ==--5ae156fb7d5233ef35f35cd82d1a5d38bcd86cd1.gif" width="1" /></p>