SeekableHTTPFile.py 文件源码

def __init__(self, url, name=None, requests_session=None, timeout=30):
        IOBase.__init__(self)
        self.url = url
        self.sess = requests_session if requests_session is not None else requests.session()
        self._seekable = False
        self.timeout = timeout
        f = self.sess.head(url, headers={'Range': 'bytes=0-'}, timeout=timeout)
        if f.status_code == 206 and 'Content-Range' in f.headers:
            self._seekable = True
        self.len = int(f.headers["Content-Length"])
        if name is None:
            if "Content-Disposition" in f.headers:
                value, params = cgi.parse_header(f.headers["Content-Disposition"])
                if "filename" in params:
                    self.name = params["filename"]
        else:
            self.name = name
        f.close()
        self._pos = 0
        self._r = None