Rails - Dec 2005 - Getting the content-type of an incoming js file.

In a controller I''d like to distinguish between a request initiated by
a client script tag ... eg

<script src="/content/pages/my_page"
type="text/javascript"></script>

In other words, is there a way, from within the controller to tell if
it was being called from a client script tag like above...rather than
from within the controller itself?

I don''t mean request.xhr? - the controller being called from the client
w/Ajax.

I''ve looked at request.content_type,
headers[''content-type''],
request.env[''CONTENT_TYPE''].

Using a litle routing(to the same class) and changing the path above
to /js/pages/my_page I''ve managed but i''d like to keep the
path the
same. Am I missing something?

Thank you lots. :Paul