Comment 1 for bug 381246

Well, adding port to the "Host" header isn't an RFC violation.

RFC2616 says in 14.23 Host
   The Host request-header field specifies the Internet host and port
   number of the resource being requested, as obtained from the original
   URI given by the user or referring resource (generally an HTTP URL,
   as described in section 3.2.2). The Host field value MUST represent
   the naming authority of the origin server or gateway given by the
   original URL. This allows the origin server or gateway to
   differentiate between internally-ambiguous URLs, such as the root "/"
   URL of a server for multiple host names on a single IP address.
       Host = "Host" ":" host [ ":" port ] ; Section 3.2.2

Nagios plugins 1.4.13 fixed it in its 2053 revision so that if it's default port 80 the port part is omitted, which the RFC allows to do. It was done to workaround buggy servers (see
http://sourceforge.net/tracker/?func=detail&aid=2082501&group_id=29880&atid=397597 for details) that don't support the "Host:" header correctly.

I'm not sure support for buggy servers should be considered a bug, and this will definitely not trigger a hardy SRU. We should move to 1.4.13 though, so I'm keeping this as a wishlist item.

Note: there is a RFC violation in this plugin, though: the "Host" header shouldn't even be present if you make a HTTP/1.0 request, as it is a HTTP/1.1 thing.