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copied!<p>You access a back end with a url like <a href="http://instance.backend.appid.appspot.com" rel="nofollow">http://instance.backend.appid.appspot.com</a> (see <a href="http://code.google.com/appengine/docs/python/backends/overview.html#Addressing_Backends" rel="nofollow">the docs</a>). Since you can't make an XHR to a page like this from an page rendered on <a href="http://appid.appspot.com" rel="nofollow">http://appid.appspot.com</a>, you have basically two options:</p> <p>You can marshal the request to your backend via a servlet on your frontend. So you could do something like:</p> <pre><code>class MarshalServlet(RequestHandler): """ This class is part of your frontend. """ def post(self, instance, backend): # generate an urlfetch request to http[s]?://instance.backend.appid.appspot.com # and return its result. # (left as an exercise for the reader) # add a "dashboard" handler to your frontend application. app = webapp.WSGIApplication([('/dashboard/', MarshalServlet), # other servlets etc. ], debug=True) </code></pre> <p>Or you could use JSONP to do a cross-domain request, which is easy with <a href="http://api.jquery.com/jQuery.getJSON/" rel="nofollow">jQuery's getJSON method</a>:</p> <pre><code>$.getJSON("http://instance.backend.appid.appspot.com/dashboard/", function() { alert("success"); }); </code></pre> <p>It's not clear to me what your /dashboard/ handler does, so I'm not sure if it can/should return JSON or if you care about the headers and so on.</p> <p>Also note that using the getJSON method won't send along cookies, but you could do that with a marshaling servlet.</p>

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