request.py 文件源码

def urlopen(url, data=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT,
            *, cafile=None, capath=None, cadefault=False):
    global _opener
    if cafile or capath or cadefault:
        if not _have_ssl:
            raise ValueError('SSL support not available')
        context = ssl._create_stdlib_context(cert_reqs=ssl.CERT_REQUIRED,
                                             cafile=cafile,
                                             capath=capath)
        https_handler = HTTPSHandler(context=context, check_hostname=True)
        opener = build_opener(https_handler)
    elif _opener is None:
        _opener = opener = build_opener()
    else:
        opener = _opener
    return opener.open(url, data, timeout)