Rust Tunnel Proxy: reqwest and isahc

use reqwest::{Proxy, Client};
use std::env;
 
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let host = env::var("PROXY_HOST").unwrap_or_else(|_| "t.16yun.cn".into());
    let port = env::var("PROXY_PORT").unwrap_or_else(|_| "31111".into());
    let user = env::var("PROXY_USERNAME").unwrap_or_else(|_| "user".into());
    let pass = env::var("PROXY_PASSWORD").unwrap_or_else(|_| "password".into());
 
    let proxy_url = format!("http://{}:{}@{}:{}", user, pass, host, port);
    let proxy = Proxy::all(&proxy_url)?;
 
    let client = Client::builder()
        .proxy(proxy)
        .timeout(std::time::Duration::from_secs(15))
        .build()?;
 
    let resp = client.get("https://httpbin.org/ip").send().await?;
    println!("{}", resp.text().await?);
 
    Ok(())
}

// HTTP Proxy-Tunnel (valid)
let resp = client.get("http://httpbin.org/ip")
    .header("Proxy-Tunnel", "rust-demo")
    .send().await?;
 
// HTTPS Proxy-Tunnel (invalid — reqwest does not support custom headers during CONNECT)
let resp = client.get("https://httpbin.org/ip")
    .header("Proxy-Tunnel", "rust-demo") // This header is not sent during CONNECT
    .send().await?;

use isahc::{HttpClient, Request, auth::Authentication};
use std::env;
 
fn main() -> Result<(), isahc::Error> {
    let host = env::var("PROXY_HOST").unwrap_or_else(|_| "t.16yun.cn".into());
    let port = env::var("PROXY_PORT").unwrap_or_else(|_| "31111".into());
    let user = env::var("PROXY_USERNAME").unwrap_or_else(|_| "user".into());
    let pass = env::var("PROXY_PASSWORD").unwrap_or_else(|_| "password".into());
 
    let client = HttpClient::builder()
        .proxy(Some(format!("http://{}:{}", host, port).parse().unwrap()))
        .proxy_authentication(Authentication::basic(user, pass))
        .timeout(std::time::Duration::from_secs(15))
        .build()?;
 
    let resp = client.get("https://httpbin.org/ip")?;
    println!("{}", resp.text()?);
 
    Ok(())
}