[Matthias247]

You can use `Futures::StreamExt::buffer_unordered` for this. [1] is an example where I used it for benchmark which creates a certain amount of QUIC connections at a time.

But you can also spawn all tasks upfront via `tokio::spawn`, and let them wait on a `tokio::sync::Semaphore` before making the request. The drawback of this is that you might allocate more memory for tasks upfront - but if you don't have an extremely high number it might not matter.

[1] https://github.com/quinn-rs/quinn/blob/de627437bc7d836564c36...

[singhrac]

This is a late comment, but this helped me out a lot. Thank you for the detailed explanation and code example, I appreciate it.