def getAllHeaders():
        """
        Return dictionary mapping the names of all received headers to the last
        value received for each.

        Since this method does not return all header information,
        C{requestHeaders.getAllRawHeaders()} may be preferred.
        """

        Return dictionary mapping the names of all received headers to the last
        value received for each.

        Since this method does not return all header information,
        C{requestHeaders.getAllRawHeaders()} may be preferred.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/iweb.py