create a http server with a trace route in rust

To create an HTTP server with a trace route in Rust, we can use the hyper crate for the server and tracing crate for trace logging. We'll also need to use the tokio crate to manage asynchronous tasks.

Here's an example of how we can create an HTTP server that returns the trace route in the response header:


main.rs
use hyper::{Body, Request, Response, Server};
use tracing::{info, instrument};
use std::net::SocketAddr;

#[tokio::main]
async fn main() {
    // set up tracing
    tracing_subscriber::fmt().init();

    // configure our server's address
    let addr = SocketAddr::from(([127, 0, 0, 1], 8080));

    // create a new server and run it
    let server = Server::bind(&addr).serve(make_svc);

    if let Err(e) = server.await {
        eprintln!("Error occurred: {}", e);
    }
}

async fn make_svc(req: Request<Body>) -> Result<Response<Body>, hyper::Error> {
    // get the trace route from the request headers
    let trace_route = req.headers()
        .get("Trace-Route")
        .and_then(|value| value.to_str().ok())
        .unwrap_or("unknown");

    // log the trace route
    info!("Received request with Trace-Route: {}", trace_route);

    // create the response with the trace route in the headers
    let response = Response::builder()
        .header("Trace-Route", trace_route)
        .body(Body::empty())
        .unwrap();

    Ok(response)
}
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In this example, we define an async make_svc function that takes a Request and returns a Response. This function first extracts the Trace-Route header from the request and logs it using the tracing crate. After that, it creates a new response with the Trace-Route header in it and returns it to the caller.

To run the server, we define a main function that initializes tracing and starts the HTTP server using the hyper crate. The server listens on localhost:8080 and delegates incoming requests to the make_svc function.

Once you run the program, you can send HTTP requests to localhost:8080 with a Trace-Route header to see the trace route information in the response headers.

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