The AJAX tracking program has nine lives, many have died, but keep coming back. The latest, Google’s John Mueller said on Twitter last week, “We stopped supporting AJAX crawling not long ago, and now we are just indexing/processing #! URLs directly.”
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But as a reminder, he did it in 2015, 2017, and 2018. Passed away, he is still alive in 2020, a little bit. You just can’t kill the power of hashbangs.
In short, stay away from relying on the AJAX tracking scheme, it has indeed been deprecated, just check the disclaimer at the top of this page.
It has been officially deprecated since around 2015, but since then, Google has managed to continue to access the content during its demise.
We dropped support for AJAX crawling a while ago, and now just index / render #! URLs directly. Redirecting & canonical are good practices to clean that up, but it can be good to dig up links going there too (sometimes they’re internal & can easily be fixed).
— 🍌 John 🍌 (@JohnMu) May 27, 2021