Hi. I have written this code to write custom "resource handlers" for exceptions. Using adapters directly avoids the use of the context. class DefaultExceptionHandler(object): # TODO catch all error handling implements(inevow.ICanHandleException) def renderHTTP_exception(self, ctx, reason): def cb(html): request.write(html) request.finishRequest(False) log.err(reason) request = inevow.IRequest(ctx) error = reason.value # make error available to the adapter request.error = error rend = inevow.IResource(error) rend.renderHTTP(ctx).addCallback(cb) # replace the default one appserver.DefaultExceptionHandler = DefaultExceptionHandler class ExceptionResource(Adapter, rend.Page): docFactory = loaders.stan( t.html[ t.head[ t.title["Oops"] ], t.body[ t.p(render=t.directive("string")) ] ] ) class ZeroDivisionResource(Adapter, rend.Page): implements(inevow.IRenderer) docFactory = loaders.stan( t.html[ t.head[ t.title["Oops"] ], t.body[ t.p[ t.xml("∞") ] ] ] ) registerAdapter(ExceptionResource, Exception, inevow.IResource) registerAdapter(ZeroDivisionResource, ZeroDivisionError, inevow.IResource) Example: class OopsPage(rend.Page): def exception(self, ctx, data): 1/0 # cause an exception on purpose docFactory = loaders.stan(exception) Regards Manlio Perillo