human
I wrote the below code

    if (headers is None):
        headers = []
    else:
        headers = list(headers)
    headers.append(('Vary', 'X-Auth-Token'))
    if (body is None):
        body = ''
        status = (status or (http_client.NO_CONTENT, http_client.responses[http_client.NO_CONTENT]))
    else:
        content_types = [v for (h, v) in headers if (h == 'Content-Type')]
        if content_types:
            content_type = content_types[0]
        else:
            content_type = None
        if ((content_type is None) or (content_type in JSON_ENCODE_CONTENT_TYPES)):
            body = jsonutils.dump_as_bytes(body, cls=utils.SmarterEncoder)
            if (content_type is None):
                headers.append(('Content-Type', 'application/json'))
        status = (status or (http_client.OK, http_client.responses[http_client.OK]))
    def _convert_to_str(headers):
        str_headers = []
        for header in headers:
            str_header = []
            for value in header:
                if (not isinstance(value, str)):
                    str_header.append(str(value))
                else:
                    str_header.append(value)
            str_headers.append(tuple(str_header))
        return str_headers
    headers = _convert_to_str(headers)
    resp = webob.Response(body=body, status=('%d    %s' % status), headerlist=headers, charset='utf-8')
    if (method and (method.upper() == 'HEAD')):
        stored_headers = resp.headers.copy()
        resp.body = ''
        for (header, value) in stored_headers.items():
            resp.headers[header] = value
    return resp

What's a good function header?
assistant
#Here's a good function header.

def render_response(body=None, status=None, headers=None, method=None):