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    <title>逆向手记</title>
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    <description>写自媒体与电商平台的数据采集、接口协议还原、参数加密分析，以及采集系统与数据管道在长期运行中遇到的实际问题。文章只写验证过的内容。同时承接相关的数据采集与分析需求。</description>
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      <title>盐值随版本变动怎么办：从静态资源里自动提取</title>
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      <pubDate>Mon, 24 Aug 2026 00:00:00 GMT</pubDate>
      <description>写死盐值的采集脚本会在对方发版当天全线失效。把提取动作做成运行时的一步，比每次手工重新逆向划算得多。</description>
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      <title>从一个 sign 参数入手：还原某电商平台商品详情接口的签名算法</title>
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      <pubDate>Fri, 21 Aug 2026 00:00:00 GMT</pubDate>
      <description>商品详情接口带一个 32 位的 sign，改动任意查询参数都会返回 403。整个过程分三步：定位生成位置、剥离混淆、脱离浏览器环境复现。</description>
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      <title>一套运行两年的采集系统，调度与去重上的实际问题</title>
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      <pubDate>Wed, 12 Aug 2026 00:00:00 GMT</pubDate>
      <description>爬虫写完只是开始。任务调度、失败重试、增量去重、代理池健康度，才是长期维护的主要成本。记录两年里改过三版的几个设计。</description>
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      <title>主流平台接口收紧这一年：几个可观察到的趋势</title>
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      <pubDate>Sun, 02 Aug 2026 00:00:00 GMT</pubDate>
      <description>开放接口减少、风控前移、客户端加密普及。对采集方来说，成本结构和技术选型都在变。</description>
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