def finalize(self):
        """Transform headers (and cookies) into self.header_list.

        (Core)
        """
        try:
            code, reason, _ = httputil.valid_status(self.status)
        except ValueError:
            raise cherrypy.HTTPError(500, sys.exc_info()[1].args[0])

        headers = self.headers

        self.status = '%s %s' % (code, reason)
        self.output_status = (
            ntob(str(code), 'ascii') + b' ' + headers.encode(reason)
        )

        if self.stream:
            # The upshot: wsgiserver will chunk the response if
            # you pop Content-Length (or set it explicitly to None).
            # Note that lib.static sets C-L to the file's st_size.
            if dict.get(headers, 'Content-Length') is None:
                dict.pop(headers, 'Content-Length', None)
        elif code < 200 or code in (204, 205, 304):
            # "All 1xx (informational), 204 (no content),
            # and 304 (not modified) responses MUST NOT
            # include a message-body."
            dict.pop(headers, 'Content-Length', None)
            self._flush_body()
            self.body = b''
        else:
            # Responses which are not streamed should have a Content-Length,
            # but allow user code to set Content-Length if desired.
            if dict.get(headers, 'Content-Length') is None:
                content = self.collapse_body()
                dict.__setitem__(headers, 'Content-Length', len(content))

        # Transform our header dict into a list of tuples.
        self.header_list = h = headers.output()

        cookie = self.cookie.output()
        if cookie:
            for line in cookie.split('\r\n'):
                name, value = line.split(': ', 1)
                if isinstance(name, str):
                    name = name.encode('ISO-8859-1')
                if isinstance(value, str):
                    value = headers.encode(value)
                h.append((name, value))
Transform headers (and cookies) into self.header_list.

        (Core)
        
cherrypy/_cprequest.py