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import Image, cStringIO
def response(context, flow):
if flow.response.headers["content-type"] == ["image/png"]:
s = cStringIO.StringIO(flow.response.content)
img = Image.open(s)
img = img.rotate(180)
s2 = cStringIO.StringIO()
img.save(s2, "png")
flow.response.content = s2.getvalue()
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