make a http connect request in rust

To make an HTTP CONNECT request in Rust, you can use the hyper crate, which is a popular HTTP library for Rust. Here is an example code to make a CONNECT request:

main.rs
use hyper::{Client, Uri};
use hyper::client::HttpConnector;
use tokio::io::{stdout, AsyncWriteExt};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client: Client<HttpConnector> = Client::new();
    let url: Uri = "http://example.com".parse()?;
    let mut stream = client.connect(url.host().unwrap(), url.port_u16().unwrap_or(80)).await?;
    stream.write_all(b"GET / HTTP/1.1\r\nHost: example.com\r\nConnection: close\r\n\r\n").await?;
    let (parts, _) = stream.read_upto(b"\r\n\r\n".as_ref()).await?;
    stdout().write_all(&parts).await?;
    Ok(())
}
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In this code, we first create a Client object and then parse the URL we want to connect to. We then use the Client object to connect to the host using the connect method.

Once the connection is established, we send a GET request manually by writing the request bytes to the stream using the write_all method. We also include the Host header so that the server knows which domain we're trying to connect to.

Finally, we read the response bytes using the read_upto method until we see the end of the response headers (\r\n\r\n). We then print the response body to the console using stdout.

Note that we included the tokio crate in our dependencies as it provides an asynchronous runtime for Rust.