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		<title>Etag on 春江暮客</title>
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				<title>用 Python 减少重复下载：ETag、304 与本地 JSON 缓存</title>
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				<description>用 Python 标准库实现条件 GET，把 ETag 与数据一起保存，并用本地服务验证 304、更新和失败保护。</description>
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