How to limit task number in rust future or tokio

just like Limit The Number Of C# Tasks That Run In Parallel - Daniel Schroeder’s Programming Blog said, i write a client requests to server by reqwest, but i donot want wast lots of bandwith and/or doss the server. so how to contral the task number in rust future or tokio or reqwest?

I wrote this a long time ago: gist which performs up to ten requests at a time.

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