Downloader.py 文件源码

def __init__(self, url, outputfile, contextFactory=None, *args, **kwargs):
        if hasattr(client, '_parse'):
            scheme, host, port, path = client._parse(url)
        else:
            try:
                from twisted.web.client import _URI as URI
            except ImportError:
                from twisted.web.client import URI
            uri = URI.fromBytes(url)
            scheme = uri.scheme
            host = uri.host
            port = uri.port or (443 if scheme == 'https' else 80)
            path = uri.path

        self.factory = HTTPProgressDownloader(url, outputfile, *args, **kwargs)
        if scheme == "https":
            from twisted.internet import ssl
            if contextFactory is None:
                contextFactory = ssl.ClientContextFactory()
            self.connection = reactor.connectSSL(host, port, self.factory, contextFactory)
        else:
            self.connection = reactor.connectTCP(host, port, self.factory)