hello_world.rs

use futures_util::{SinkExt, StreamExt, TryStreamExt};
use reqwest::Client;
use reqwest_websocket::{Error, Message, RequestBuilderExt};

#[tokio::main(flavor = "current_thread")]
async fn main() -> Result<(), Error> {
    let websocket = Client::default()
        .get("wss://echo.websocket.org/")
        .upgrade()
        .send()
        .await?
        .into_websocket()
        .await?;

    let (mut tx, mut rx) = websocket.split();

    tokio::task::spawn_local(async move {
        for i in 1..11 {
            tx.send(Message::Text(format!("Hello, World! #{i}")))
                .await
                .unwrap();
        }
    });

    while let Some(message) = rx.try_next().await? {
        if let Message::Text(text) = message {
            println!("received: {text}");
        }
    }

    Ok(())
}