What language (and library) can be used most economically (in terms of memory, CPU time, and other resources) to send a lot of HTTP requests?

Question

HTTP headers

Actually, the whole question is in the title, we are talking about potentially thousands of requests per second to different nodes. So far, I've settled on C# standard HTTP client + asynchronous response processing.

Answer 1

C# will allow you to do this, as long as you have enough hardware.
If you need it for load testing, then there is nbomber, which allows you to flexibly configure the load and send tens of thousands of requests

Answer 2

golang
is also praised for rust, but it is more difficult to master