Index: modpython_frontend.py
===================================================================
--- modpython_frontend.py	(revision 7)
+++ modpython_frontend.py	(working copy)
@@ -122,6 +122,7 @@
         self.req.content_type = mimetype
         self.req.set_content_length(stat.st_size)
         self.req.headers_out.add('Last-Modified', http_date(stat.st_mtime))
+        self.req.headers_out.add('Cache-Control', 'no-store')
 
         self.req.sendfile(path)
         raise RequestDone
Index: main.py
===================================================================
--- main.py	(revision 7)
+++ main.py	(working copy)
@@ -190,6 +190,7 @@
         self.send_header('Content-Type', mimetype)
         self.send_header('Content-Length', stat.st_size)
         self.send_header('Last-Modified', last_modified)
+        self.send_header('Cache-Control', 'no-store')
         self.end_headers()
 
         if self.method != 'HEAD':