A time out error after upgrading from 0.11.x to 0.12.x and using http2

[tatodorov]

I have the following sample code which works with reqwest 0.11.x, but I get a timeout when using reqwest 0.12.x.
When I switch to HTTP 1.1 by replacing .http2_prior_knowledge() with .http1_only(), the code works also with 0.12.x.
So, seems to be HTTP2 related.

Cargo.toml:

[package]
name = "httpclient"
version = "0.1.0"
edition = "2021"

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

[dependencies]
reqwest = { version = "0.12.4", default-features = false, features = [
    "http2",
    "rustls-tls",
    "brotli",
    "gzip",
] }

# reqwest = { version = "0.11.27", default-features = false, features = [
#     "rustls-tls",
#     "brotli",
#     "gzip",
# ] }

tokio = { version = "1.32.0", features = [
    "rt-multi-thread",
    "macros",
    "fs",
    "io-util",
], default-features = false }

log = "*"
env_logger = { version = "0.11.3"}

main.rs:

use reqwest::ClientBuilder;
use reqwest::header::HeaderMap;
use std::collections::HashMap;
use std::time::Duration;
use env_logger;

#[tokio::main]
async fn main() {

    env_logger::init();

    let result = ClientBuilder::new()
        .timeout(Duration::from_secs(5))
        .pool_idle_timeout(Duration::from_secs(5))
        .tcp_keepalive(Duration::from_secs(5))
        .connect_timeout(Duration::from_secs(5))
        .connection_verbose(true)
        .https_only(true)
        .http2_prior_knowledge()
        .gzip(true)
        .brotli(true)
        .http2_adaptive_window(true)
        .build();
    

    let client = match result {
        Ok(clnt) => clnt,
        Err(error) => {
            eprintln!("Error: {:?}", error);
            return;
        }
    };

    let url = "https://search.brave.com/search?q=wifi7&offset=0";

    let headers = HeaderMap::try_from(&HashMap::from([
        ("User-Agent".to_string(), "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:125.0) Gecko/20100101 Firefox/125.0".to_string()),
        ("Referer".to_string(), "https://search.brave.com/".to_string()),
    ])).unwrap();


    let result2 = client
    .get(url)
    .headers(headers)
    .send()
    .await;

    match result2 {
        Ok(resp) => println!("Response: {:#?}", resp),
        Err(err) => eprintln!("Error: {:?}", err),
    }
}

By running RUST_LOG=reqwest=trace cargo run, I see the following output:

   Compiling httpclient v0.1.0 (/workspaces/rust-playground/httpclient)
    Finished dev [unoptimized + debuginfo] target(s) in 5.60s
     Running `target/debug/httpclient`
[2024-05-11T03:44:12Z DEBUG reqwest::connect] starting new connection: https://search.brave.com/
[2024-05-11T03:44:12Z TRACE reqwest::connect::verbose] a754bb40 write: b"PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n"
[2024-05-11T03:44:12Z TRACE reqwest::connect::verbose] a754bb40 write: b"\0\0\x18\x04\0\0\0\0\0\0\x02\0\0\0\0\0\x04\0\0\xff\xff\0\x05\0\0@\0\0\x06\0\0@\0"
[2024-05-11T03:44:12Z TRACE reqwest::connect::verbose] a754bb40 write: b"\0\0\x86\x01\x05\0\0\0\x01\x82\x87A\x8cAGa'^;\x07\xdc\xab\x90\xf4\xff\x04\x92a\x05\x1d\x84\x9f\xfc\xed\x07\x83Jg~\x0f,\xa8*`\x07s\x92\x9d)\xad\x17\x18a\x05\x1d\x84\x9dx\xec\x1fr\xaeC\xd2\xc7z\xbe\xd0\x7ff\xa2\x81\xb0\xda\xe0S\xfa\xd02\x1a\xa4\x9d\x13\xfd\xa9\x92\xa4\x96\x854\x0c\x8aj\xdc\xa7\xe2\x81\x02\xe1o\xedK;\xdc\x08\x9b\\\x1f\xda\x98\x8aN\xa7`@\x08\0\x10\x05L&\xb0\xb2\x9f\xcb\x01\x13k\x83S\x83\xf9c\xe7P\x87\x9b\xd9\xab\xfaR;?"
[2024-05-11T03:44:12Z TRACE reqwest::connect::verbose] TODO: verbose poll_read
[2024-05-11T03:44:12Z TRACE reqwest::connect::verbose] a754bb40 write: b"\0\0\0\x04\x01\0\0\0\0"
[2024-05-11T03:44:12Z TRACE reqwest::connect::verbose] TODO: verbose poll_read
[2024-05-11T03:44:13Z TRACE reqwest::connect::verbose] TODO: verbose poll_read
[2024-05-11T03:44:13Z TRACE reqwest::connect::verbose] TODO: verbose poll_read
[2024-05-11T03:44:13Z TRACE reqwest::connect::verbose] TODO: verbose poll_read
[2024-05-11T03:44:13Z TRACE reqwest::connect::verbose] TODO: verbose poll_read
[2024-05-11T03:44:13Z TRACE reqwest::connect::verbose] TODO: verbose poll_read
[2024-05-11T03:44:13Z TRACE reqwest::connect::verbose] TODO: verbose poll_read
[2024-05-11T03:44:13Z TRACE reqwest::connect::verbose] TODO: verbose poll_read
[2024-05-11T03:44:13Z TRACE reqwest::connect::verbose] TODO: verbose poll_read
[2024-05-11T03:44:13Z TRACE reqwest::connect::verbose] a754bb40 write: b"\0\0\x04\x08\0\0\0\0\0\0\0\x97\xd8\0\0\x04\x03\0\0\0\0\x01\0\0\0\x07"
Error: reqwest::Error { kind: Request, url: Url { scheme: "https", cannot_be_a_base: false, username: "", password: None, host: Some(Domain("search.brave.com")), port: None, path: "/search", query: Some("q=wifi7&offset=0"), fragment: None }, source: TimedOut }