[jetty-user] Best way to serve resources from arbitrary location?

In our app we'd like to serve static resources from different locations 
depending on some rules. For example, if the request is for 
http://foo.example.com/bar.html, we might want to serve that request 
from the /path/to/foo directory and not from the webapp directory.

In some cases, we'll want to serve the resource from a URL. For example, 
if the request is for http://foo.example.com/myimage.jpg, we might want 
to serve it from Amazon S3: 
http://images.foo.com.s3.amazonaws.com/myimage.jpg

I've been struggling with how best to do this. I could just implement 
all the rules in a servlet or servlet filter, and write each file 
directly to the response object, but then I lose the benefit of all the 
things that the default Jetty handlers do, like deal with compressed 
files, caching, setting content length, deal with HEAD requests, etc..

I don't want to reinvent the wheel. What, in general, is the best way to 
get Jetty's default resource serving mechanism to load resources from 
arbitrary locations?


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