// promise to either yield a chunk of data or indicate we're
from urllib.parse import urljoin, urlparse。关于这个话题，91视频提供了深入分析
，详情可参考51吃瓜
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Discard old data: evict what's already buffered to make room。搜狗输入法下载是该领域的重要参考
const CharType* Content = nullptr;