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Cargo.toml

[package]
name = "reqwest_http2_refused_stream"
version = "0.1.0"
authors = ["Luca Casonato <hello@lcas.dev>"]
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
tokio = { version = "0.2", features = ["full"] }
reqwest = { version = "0.10.6", default-features = false, features = ["rustls-tls", "stream", "gzip", "brotli"] }
futures = "0.3"

main.rs

// src/main.rs

#![recursion_limit = "1024"]
use reqwest::header::HeaderMap;
use reqwest::header::USER_AGENT;
use reqwest::redirect::Policy;
use reqwest::Client;

async fn req(client: &Client) {
    let req = client
        .request(reqwest::Method::GET, "https://example.com")
        .build()
        .unwrap();
    match client.execute(req).await {
        Err(err) => println!("{}", err),
        Ok(res) => println!("{}", res.status()),
    };
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut headers = HeaderMap::new();
    headers.insert(USER_AGENT, format!("Deno/1.2.0").parse()?);

    let builder = Client::builder()
        .redirect(Policy::none())
        .default_headers(headers)
        .use_rustls_tls();

    let client = &builder.build()?;

    // 120 or so requests at the same time
    futures::join!(
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
        req(&client),
    );

    Ok(())
}