diff -r 058bb3dc685f -r 0b59724cb3f2 cubicweb/etwist/http.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cubicweb/etwist/http.py	Sat Jan 16 13:48:51 2016 +0100
@@ -0,0 +1,43 @@
+"""twisted server for CubicWeb web instances
+
+:organization: Logilab
+:copyright: 2001-2011 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"
+
+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 headers
+        for k, values in self._headers_out.getAllRawHeaders():
+            self._twreq.responseHeaders.setRawHeaders(k, values)
+        # 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):
+        # we must set code before writing anything, else it's too late
+        if self._code is not None:
+            self._twreq.setResponseCode(self._code)
+        if self._stream is not None:
+            self._twreq.write(str(self._stream))
+        self._twreq.finish()
+
+    def __repr__(self):
+        return "<%s.%s code=%d>" % (self.__module__, self.__class__.__name__, self._code)