Those redirects deliver a 302 or 301 code, which usually tells search engines to index your error page at many different URLs.

此类重定向提交的是302或301代码，通常这会告诉搜索引擎将你的错误页跟许多不同的URL一起索引起来。

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Using the right tag for the job is essential, and search engines love semantic code.

——在工作中适用正确的标签能帮助你提高效率，而且搜索引擎偏好有意义的代码。

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Sitemap XML validator checks your site map for valid XML code so you can correct errors before you submit it to search engines.

Sitemap XML 验证器检查有效 XML 代码的站点地图，以便您可以先纠正错误，然后再提交到搜索引擎。

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In software, they arise when someone develops a company's online maps, calendars, photos, search engines and other products, usually through relatively small amounts of code that is posted on the Internet.

FORBES: Magazine Article

Cybercriminals and security researchers have used search engines, including Google, for years to scour the Web for instances of outdated code open to intrusions.

FORBES: Magazine Article