最后修改的标头 (LMH) 在动态站点上频繁更改会产生什么影响？
我们的 Web 应用程序存在缺陷，正在将所有页面的“上次修改标题”更新为上次发布的日期。我们正在修复该缺陷，但我们想知道该缺陷是否会影响该网站的 SE 结果。
基本上，每次更新网站上的页面时，即使页面尚未更新，所有页面都会更新上次修改日期。
由于所有页面更改过于频繁，搜索引擎是否有可能将该网站检测为垃圾邮件？ - 理论
We have a web application that has a defect and is updating all pages Last Modified Header to the date of the last publish. We are in the process of fixing the defect, but we wanted to know if this defect might impact our SE results for this site.
Basically each time a page on the site get's updated all pages updates the last modified date even if the page has not been updated.
Is there any possibility of the Search Engine detecting the site as spam, since all pages are changing too often? -- Theory
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它不太可能发生太大变化，因为所有搜索引擎都会注意到您的内容实际上没有改变。无论您告诉他们什么，他们都会以与观察到的内容更改速度相称的速度进行爬网，并且像这样的小更改不会在索引中标记为内容更改。
It's unlikely to change much, since all the search engines will notice that your content hasn't actually changed. They will crawl at a rate commensurate with the observed rate of content change, more or less regardless of what you tell them, and small changes like that won't be marked as content changes in the index.
过于频繁地更改上次修改日期不会对三大数据产生负面影响。
通过元数据（和 sitemap.xml）影响抓取速度的唯一方法是减少它。其原因是提高排名/索引的指标太容易被滥用。然而，对于资源敏感的网站管理员来说，降低蜘蛛速度仍然是一个选择。
Changing the last modified date too often will NOT have a negative impact with the big 3.
The only way you can affect crawl rate via meta data (and sitemap.xml) is to reduce it. The reason for this is indicators that increase ranking/indexing are too easily abused. However, reducing spider rate is still an option for the resource conscious webmaster.