create a http server with a head route in rust

To create a http server with a head route in Rust, we will use the hyper crate which is a popular library for building HTTP servers and clients in Rust.

Here is a basic example of how to create a HTTP server with a HEAD route in Rust:


main.rs
use hyper::{Body, Request, Response, Server};
use hyper::service::make_service_fn;
use hyper::header::{HeaderValue, CONTENT_LENGTH};

async fn head_handler(_req: Request<Body>) -> Result<Response<Body>, hyper::Error> {
    // Create a response with an empty body to handle HTTP Head request
    let mut resp = Response::new(Body::empty());
    resp.headers_mut().insert(CONTENT_LENGTH, HeaderValue::from_static("0"));
    Ok(resp)
}

#[tokio::main]
async fn main() {
    // Create a service function to handle all incoming connections
    let make_svc = make_service_fn(|_conn| async {
        Ok::<_, hyper::Error>(hyper::service::service_fn(head_handler))
    });

    // Bind and start the server
    let addr = ([127, 0, 0, 1], 3000).into();
    let server = Server::bind(&addr).serve(make_svc);
    println!("Listening on http://{}", addr);

    if let Err(e) = server.await {
        eprintln!("server error: {}", e);
    }
}
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In this example, we defined an async function called head_handler that takes a Request instance as input and returns a Result<Response<Body>, hyper::Error> instance. We use the Response::new(Body::empty()) method to create an empty body for the HTTP HEAD request. We then insert the header Content-Length: 0 to indicate the size of the empty body.

We then create a new service function using the make_service_fn function and pass in our head_handler function. This function will handle incoming connections on port 3000 and respond with a header indicating the size of an empty response body for HTTP HEAD requests.

Finally, we use the Server::bind() method to bind the server to the specified addr (127.0.0.1:3000) and start the server using the await method.

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