> From: Caldarale, Charles R
> Subject: RE: Tomcat 6.0 always uses default host in multi-host config
>
> > 1) If useIPVHosts=false (default), then the host header name
> > determines <Host> for processing, or default host of the Engine.
> > 2) If useIPVHosts=true, then IP address of request determines <Host>
> > for processing, providing the IP is provided as the host name, or
> > <Alias>. If not found, then default host of Engine applies.
> > 3) Nothing external to server.xml matters to Tomcat in resolving
> > <Host> for processing.
> >
> > Does that sound accurate?
>
> I think so, but will have to verify by looking at current code.
I was mistaken about #3: there is a lookup done to convert the IP address of
the socket the request arrived on to a name; this is done by the following code
in org.apache.coyote.http11.Http11Processor (and equivalents for other
connector types):
if ((localName == null) && (socket != null)) {
InetAddress inetAddr = socket.getLocalAddress();
if (inetAddr != null) {
localName = inetAddr.getHostName();
}
}
Since the JVM caches DNS entries, I would think this will cause only one
external DNR request for the lifetime of Tomcat. Note that this is done for
the _request_, not the <Host>, and if the name is not resolvable, the symbolic
form of the IP address is returned (so watch out for mixed IPv4/IPv6 networks).
The value of the <Host> name or <Alias> elements must match that returned by
InetAddress.getHostName() to get a successful match.
- Chuck
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