HTTP 400. Bad request! Sit! Stay!

[nickarls]

I have a 4.2.2.GA running with -b 0.0.0.0 and no virtual hosts.

http://localhost (locally) works
http://hostname (locally) works
http://ip (locally) works
http://ip (remotely) works
http://hostname (remotely) works

but

http://<DNS entry that resolves to hostname/ip>

fails with a blank page or HTTP 400 Bad Request

What checks does JBoss/Tomcat do to see if there is some hostname mixup?

Thanks in advance,
Nik

[nickarls]

It turns out that telnetting to the DNS name port 80 and doing a "GET /" returns the page just fine.

Is it some conspiracy amongst all browsers to consider a response as bad if it comes from a hostname it didn't expect? And if so, what is the remedy? Some alias or virtual host in JBoss?

Thanks in advance,
- Nik

[nickarls]

More specifically, dumping the reponse headers gives

null:
 HTTP/1.1 400 No Host matches server name thehost.thedomain.com
Transfer-Encoding:
 chunked
Date:
 Mon, 01 Dec 2008 12:11:43 GMT
Connection:
 close
Server:
 Apache-Coyote/1.1

ping thehost.thedomain.com does lead back to the correct host

[nickarls]

I tried using virtual hosts and it seems to be working when used from the internal network but the above mentioned error still occurs when coming from an external network.

Network configurations aside, how can this error anyways be related to where the request is originating from?