How to remove http2 support?

[lz1998]

I use both axum and reqwest.

Before importing reqwest in toml, the size of release binary is 1.7MB.

After importing reqwest in toml, the size of release binary is 3.0MB. (I don't use it in code.)

Is it possible to remove http2 support to reduce size?

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

[dependencies]
axum = "0.4"
tokio = { version = "1.0", features = ["full"] }
# reqwest = "0.11" # add this line, and the size of release binary will increase 1.3MB

use axum::{response::Html, routing::get, Router};
use std::net::SocketAddr;

#[tokio::main]
async fn main() {
    let app:Router = Router::new().route("/", get(handler));

    let addr = SocketAddr::from(([127, 0, 0, 1], 3000));
    println!("listening on {}", addr);
    axum::Server::bind(&addr)
        .serve(app.into_make_service())
        .await
        .unwrap();
}

async fn handler() -> Html<&'static str> {
    Html("<h1>Hello, World!</h1>")
}

[seanmonstar]

There currently isn't a way to disable HTTP/2 support in reqwest. In a way, reqwest was using its "opinionated client"-ness to say most people want it.

But, since we do allow people to opt-in to a bunch of other things that are "hefty" to compile, it does make sense to make HTTP/2 (and HTTP/3 eventually) optional. It will require a breaking change release in reqwest, to make a feature optional.