def open_data(self, url, data=None):
        """Use "data" URL."""
        if not isinstance(url, str):
            raise IOError, ('data error', 'proxy support for data protocol currently not implemented')
        # ignore POSTed data
        #
        # syntax of data URLs:
        # dataurl   := "data:" [ mediatype ] [ ";base64" ] "," data
        # mediatype := [ type "/" subtype ] *( ";" parameter )
        # data      := *urlchar
        # parameter := attribute "=" value
        import mimetools
        try:
            from cStringIO import StringIO
        except ImportError:
            from StringIO import StringIO
        try:
            [type, data] = url.split(',', 1)
        except __HOLE__:
            raise IOError, ('data error', 'bad data URL')
        if not type:
            type = 'text/plain;charset=US-ASCII'
        semi = type.rfind(';')
        if semi >= 0 and '=' not in type[semi:]:
            encoding = type[semi+1:]
            type = type[:semi]
        else:
            encoding = ''
        msg = []
        msg.append('Date: %s'%time.strftime('%a, %d %b %Y %T GMT',
                                            time.gmtime(time.time())))
        msg.append('Content-type: %s' % type)
        if encoding == 'base64':
            import base64
            data = base64.decodestring(data)
        else:
            data = unquote(data)
        msg.append('Content-Length: %d' % len(data))
        msg.append('')
        msg.append(data)
        msg = '\n'.join(msg)
        f = StringIO(msg)
        headers = mimetools.Message(f, 0)
        #f.fileno = None     # needed for addinfourl
        return addinfourl(f, headers, url)
dataset/ETHPy150Open ofermend/medicare-demo/socialite/jython/Lib/urllib.py/URLopener.open_data