HTTP Conformance Testing

[Trevor Russ]

Are there any tools for testing the conformance of a server to the HTTP 1.1 
specification?  I've spent a while prowling for such things (yes, even 
searching the list archives), but it looks like most conformance testing is 
either for HTTP clients, or for HTML documents.  I even found 
http://www.w3.org/Test/ after some digging, but that looks like it is 
geared towards testing client applications.

Specifically, we want to test how well-formed the HTTP responses of a 
server are.

Thanks,
Trevor Russ