pafy.py 文件源码

def fetch_decode(url, encoding=None):
    """ Fetch url and decode. """
    try:
        req = g.opener.open(url)
    except HTTPError as e:
        if e.getcode() == 503:
            time.sleep(.5)
            return fetch_decode(url, encoding)
        else:
            raise

    ct = req.headers['content-type']

    if encoding:
        return req.read().decode(encoding)

    elif "charset=" in ct:
        dbg("charset: %s", ct)
        encoding = re.search(r"charset=([\w-]+)\s*(:?;|$)", ct).group(1)
        return req.read().decode(encoding)

    else:
        dbg("encoding unknown")
        return req.read()