In the dynamically serving images section
http://code.google.com/appengine/docs/python/images/usingimages.html#Serving
the documentation says:
> In the Image Handler we get the img_id
> from the request. We'll need to update the HTML
> of the Guestbook to pass the key of the greeting
> to the Image handler...
But the following code
self.response.out.write("<div><img src='img?img_id=%s'></img>" %
greeting.key())
self.response.out.write(' %s</div>' %
cgi.escape(greeting.content))
goes into MainHandler not the Guestbook Handler.
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