def _body_from_file(self, fd):
        if self.args.data:
            self.error('Request body (from stdin or a file) and request '
                       'data (key=value) cannot be mixed.')
        self.args.data = getattr(fd, 'buffer', fd).read()
Signs and timestamps a string so it cannot be forged.
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/httpie/input.py/Parser._body_from_file--crossover with--dataset/ETHPy150Open RobotWebTools/rosbridge_suite/rosbridge_server/src/tornado/web.py/RequestHandler.create_signed_value