POST request.

        :param str url: Request url
        :param dict headers: (optional) Request headers
        :param data: (optional) Dictionary, bytes, or file-like object to send in the body
        :param timeout: (optional), How long to wait for the server
            to send data before giving up, as a float,
            or a (connect timeout, read timeout) float tuple.
            Default is :py:attr:`self.timeout`
        :type timeout: float | tuple(float, float)
        :rtype: :py:class:`RequestsHttpResponse`
        :return: RequestsHttpResponse instance

def post(self, url, headers=None, data=None, timeout=None):
        """POST request.

        :param str url: Request url
        :param dict headers: (optional) Request headers
        :param data: (optional) Dictionary, bytes, or file-like object to send in the body
        :param timeout: (optional), How long to wait for the server
            to send data before giving up, as a float,
            or a (connect timeout, read timeout) float tuple.
            Default is :py:attr:`self.timeout`
        :type timeout: float | tuple(float, float)
        :rtype: :py:class:`RequestsHttpResponse`
        :return: RequestsHttpResponse instance
        """
        if timeout is None:
            timeout = self.timeout

        response = requests.post(
            url, headers=headers, data=data, timeout=timeout
        )

        return RequestsHttpResponse(response)