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    <p>Middleware is the preferred way to do things like this on an "every request" basis. For instance, here is a simple bit of middleware to add the same (example) P3P header to every response Django generates:</p> <p>In settings.py:</p> <pre><code>P3P_COMPACT = 'policyref="http://www.example.com/p3p.xml", CP="NON DSP COR CURa TIA"' MIDDLEWARE_CLASSES += ('myapp.middleware.P3PHeaderMiddleware',) </code></pre> <p>In myapp/middleware.py:</p> <pre><code>from django.conf import settings class P3PHeaderMiddleware(object): def process_response(self, request, response): response['P3P'] = getattr(settings, 'P3P_COMPACT', None) return response </code></pre> <p>You could also get a similar effect in a single view by setting the P3P header in the response:</p> <pre><code>def my_view(request): response = render_to_response('my_template.html') response['P3P'] = 'CP="NON DSP COR CURa TIA"' return response </code></pre> <p>To expand on the topic a little bit, cookies and headers such as the P3P header are both sent at the same time, as part of the response; in fact, under the hood, cookies are set with another response header. You can see the cookie header using curl:</p> <pre><code>$ curl --head http://www.google.com/ HTTP/1.1 200 OK Date: Wed, 13 Jan 2010 00:04:59 GMT Expires: -1 Cache-Control: private, max-age=0 Content-Type: text/html; charset=ISO-8859-1 Set-Cookie: PREF=ID=d2c09762c479f94e:TM=1263341099:LM=1263341099:S=oJby3NpU4RsRfuYa; expires=Fri, 13-Jan-2012 00:04:59 GMT; path=/; domain=.google.com Set-Cookie: NID=30=kdKrd5e-u6Xs7cUe3p4eaNDtv6SO88uBL5v6_M1XMTSRmkh7okxrWLOm-l_uZdN37PxQIe4dBlekFFVCpTFXGyIDlUrz1hEwhgVLvXfIik_VeVWGmWzKbA5qu_Zq0sOi; expires=Thu, 15-Jul-2010 00:04:59 GMT; path=/; domain=.google.com; HttpOnly Server: gws X-XSS-Protection: 0 Transfer-Encoding: chunked </code></pre>
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