The issue has been solved. Thanks @seanmonstar! <3

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This demonstrates an issue with connection pooling in reqwest on HTTP/2 that results in following error:

error sending request for url (https://deno-website2.now.sh/): http2 error: protocol error: not a result of an error

This repo contains two examples of the same code. One written in Go using the net/http std lib, and one using reqwest w/ rustls on a single threaded tokio event loop. Both examples start 100 concurrent goroutines/futures, each doing 20 requests to https://deno-website2.now.sh/ in series.

To run the working Go example:

$ cd go
$ GOMAXPROCS=1 go run main.go

To run the reqwest example:

$ cd reqwest
$ cargo run

If instead you create a single client per connection (no connection pooling) you do not experience this issue:

$ cd reqwest
$ cargo run --features no-pool