Download the binary file at url to distination path.

def download(self, url, dst, timeout=None):
        """Download the binary file at url to distination path.
        """
        response = self.get_response(url, timeout=timeout)
        if response:
            with open(dst, "wb") as f:
                for block in response.iter_content(1024):
                    if not block:
                        break
                    f.write(block)