Sys.sleep() in between API requests?

[tts]

Let's assume that the API provider wants me to send requests one by one, ie. not sending a new request before the previous one is taken care of. I wonder if a Sys.sleep() anywhere inside the oadoi_fetch_ function would do the trick? Or, would it need to be (if possible) in the "scope" of the plyr::llply function?

The reason why I'm asking is that I'm learning proper ways to deal with APIs, and your roadoi code acts as an excellent, well-built tutorial. In other words, my question does not refer to the Unpaywall API as such.

Thanks for any pointers!

[njahn82]

Hi @tts Just recently, there has been an update of httr, httr2, which has a great tutorial how to wrap APIs. The tutorial shows how to deal with rate limits:
https://httr2.r-lib.org/articles/wrapping-apis.html#rate-limits

I think, I would use this approach to make sure that requests are sent in accordance with the server policy.