REVISED: After some other tests - there must be encoding ONLY on unicode strings, otherwise binary file transfer fails (try nevow/examples/image_uploader) Paul Reznicek Necessary patch: =================================================================== --- appserver.py (Revision 1126) +++ appserver.py (local) @@ -170,6 +170,9 @@ if isinstance(html, str): self.write(html) server.Request.finish(self) + elif isinstance(html, unicode): + self.write(html.encode('utf8')) + server.Request.finish(self) elif html is errorMarker: ## Error webpage has already been rendered and finish called pass I believe, the wsgi.py can have similar problem: =================================================================== --- wsgi.py (Revision 1126) +++ wsgi.py (local) @@ -86,6 +86,8 @@ result = p.renderHTTP(pctx) if isinstance(result, str): request.write(result) + elif isinstance(result, unicode): + request.write(result.encode('utf8')) else: ## Exhaust the generator list(result)