def open_unknown_proxy(self, proxy, fullurl, data=None):
        type, url = splittype(fullurl)
        raise IOError, ('url error', 'invalid proxy for %s' % type, proxy)

    # External interface
Parses the payload and finds previous and current value of change_type.
dataset/ETHPy150Open kleientertainment/ds_mod_tools/pkg/win32/Python27/Lib/urllib.py/URLopener.open_unknown_proxy--crossover with--dataset/ETHPy150Open zulip/zulip/zerver/views/webhooks/taiga.py/get_old_and_new_values