diff -r eaec839ad3fe -r 1dea6e0fdfc1 etwist/http.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/etwist/http.py	Tue Apr 06 16:50:53 2010 +0200
@@ -0,0 +1,71 @@
+"""twisted server for CubicWeb web instances
+
+:organization: Logilab
+:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
+:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
+:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
+"""
+
+__docformat__ = "restructuredtext en"
+
+from cubicweb.web.http_headers import Headers
+
+class HTTPResponse(object):
+    """An object representing an HTTP Response to be sent to the client.
+    """
+    def __init__(self, twisted_request, code=None, headers=None, stream=None):
+        self._headers_out = headers
+        self._twreq = twisted_request
+        self._stream = stream
+        self._code = code
+
+        self._init_headers()
+        self._finalize()
+
+    def _init_headers(self):
+        if self._headers_out is None:
+            return
+
+        # initialize cookies
+        cookies = self._headers_out.getHeader('set-cookie') or []
+        for cookie in cookies:
+            self._twreq.addCookie(cookie.name, cookie.value, cookie.expires,
+                                  cookie.domain, cookie.path, #TODO max-age
+                                  comment = cookie.comment, secure=cookie.secure)
+        self._headers_out.removeHeader('set-cookie')
+
+        # initialize other headers
+        for k, v in self._headers_out.getAllRawHeaders():
+            self._twreq.setHeader(k, v[0])
+
+        # add content-length if not present
+        if (self._headers_out.getHeader('content-length') is None
+            and self._stream is not None):
+           self._twreq.setHeader('content-length', len(self._stream))
+
+
+    def _finalize(self):
+        if self._stream is not None:
+            self._twreq.write(str(self._stream))
+        if self._code is not None:
+            self._twreq.setResponseCode(self._code)
+        self._twreq.finish()
+
+    def __repr__(self):
+        return "<%s.%s code=%d>" % (self.__module__, self.__class__.__name__, self._code)
+
+
+def not_modified_response(twisted_request, headers_in):
+    headers_out = Headers()
+
+    for header in (
+        # Required from sec 10.3.5:
+        'date', 'etag', 'content-location', 'expires',
+        'cache-control', 'vary',
+        # Others:
+        'server', 'proxy-authenticate', 'www-authenticate', 'warning'):
+        value = headers_in.getRawHeaders(header)
+        if value is not None:
+            headers_out.setRawHeaders(header, value)
+    return HTTPResponse(twisted_request=twisted_request,
+                        headers=headers_out)