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In my GAE app I have the following handler in app.yaml: - url: /lang/strings.js script: js_lang.py So a call to /lang/strings.js will actually map to the js_lang.py request handler which populates the response as application/javascript . I want this response to be cached in the browser so that the request handler only gets called once in a while (for example when I "invalidate" the cache by importing /lang/strings.js?v=xxxx when I deploy a new version of the app. For normal static content, there is the default_expiration element, which is very handy. And results in http response headers like this: Expires: Fri, 01 Apr 2011 09:54:56 GMT Cache-Control: public, max-age=600 Ok, the question: is there an easy way for me to return headers such as this, without having to explicitly set them? Alternatively, is there a code snippet out there that accepts a few basic parameters such as "days" and produces the expected http-headers? Edit 12 April 2011 I solved this very by simply setting the two headers Expires and Cache-Control like this: import datetime thirty_days_in_seconds = 4320000 expires_date = datetime.datetime.now() + datetime.timedelta(days=30) HTTP_HEADER_FORMAT = "%a, %d %b %Y %H:%M:00 GMT" self.response.headers["Expires"] = expires_date.strftime(HTTP_HEADER_FORMAT) self.response.headers["Cache-Control"] = "public, max-age=%s" % thirty_days_in_seconds

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