[SVN] [215] - do not overwrite an existing Last-Modified header in serve_file

Revision: 215
          http://trac.axkit.org/axkit2/changeset/215
Author:   jwalt
Date:     2006-09-26 15:45:32 +0000 (Tue, 26 Sep 2006)

Log Message:
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 - do not overwrite an existing Last-Modified header in serve_file
 - implement HTTP Digest auth (qop=auth only for now)

Modified Paths:
--------------
    trunk/lib/AxKit2/HTTPHeaders.pm
    trunk/plugins/aio/serve_file
    trunk/plugins/authenticate
    trunk/plugins/serve_file