> It's a standard response code, and with a bit of luck google will scale the requests accordingly.

Google already says in the comments [1] that it would be "a fair bit of work" for them to read the standard robots.txt for "boring technical reasons". I would not necessarily rely on them to respect HTTP 429 either.

In fact, given the facts at hand with the current situation, I would guess that they probably wouldn't handle it correctly, and would cite more "boring technical reasons" when asked.

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[1] https://github.com/golang/go/issues/44577#issuecomment-11378...