request.py 文件源码

def urlopen(url, data=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT, **_3to2kwargs):
    if 'cadefault' in _3to2kwargs: cadefault = _3to2kwargs['cadefault']; del _3to2kwargs['cadefault']
    else: cadefault = False
    if 'capath' in _3to2kwargs: capath = _3to2kwargs['capath']; del _3to2kwargs['capath']
    else: capath = None
    if 'cafile' in _3to2kwargs: cafile = _3to2kwargs['cafile']; del _3to2kwargs['cafile']
    else: cafile = None
    global _opener
    if cafile or capath or cadefault:
        if not _have_ssl:
            raise ValueError('SSL support not available')
        context = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
        context.options |= ssl.OP_NO_SSLv2
        context.verify_mode = ssl.CERT_REQUIRED
        if cafile or capath:
            context.load_verify_locations(cafile, capath)
        else:
            context.set_default_verify_paths()
        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)