bingbot Series: JavaScript, Dynamic Rendering, and Cloaking. Oh My!

Last week, we posted the second blog of our bingbot Series: Optimizing Crawl Frequency. Today is Halloween and like every day, our crawler (also known as a "spider") is wandering outside, browsing the world wide web, following links, seeking to efficiently discover, index and refresh the best web content for our Bing users. Occasionally, bingbot encounters websites relying on JavaScript to render their content. Some of these sites link to many JavaScript files that need to be downloaded from the web server. In this setup, instead of making only one HTTP request per page, bingbot has to do several requests. Some some sites are spider traps, with dozens of HTTP calls required to render each page! Yikes. That's not optimal, now is it? As we shared last week at SMX East, bingbot is generally able to render JavaScript. However, bingbot does not necessarily support all the same JavaScript frameworks that are supported in the latest version of your favorite modern browser. Like other search engine crawlers, it is difficult for bingbot to process JavaScript at scale on every page of every website, while minimizing the number of HTTP requests at the same time.

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