create a http server and read the request body as form data in rust

To create a HTTP server and read the request body as form data in Rust, we can use the hyper crate.

Here's an example code snippet that demonstrates how to achieve this:


main.rs
use hyper::{Body, Request, Response, Server};
use hyper::header::{HeaderValue, CONTENT_TYPE};
use hyper::service::{make_service_fn, service_fn};
use url::form_urlencoded;

async fn handle_request(req: Request<Body>) -> Result<Response<Body>, hyper::Error> {
    let (parts, body) = req.into_parts();
    let mut res = Response::new(Body::empty());

    if parts.uri.path() == "/submit-form" && parts.method == hyper::Method::POST {
        // read the request body as form data
        let full_body = hyper::body::to_bytes(body).await?;
        let body_params = form_urlencoded::parse(&full_body)
            .into_owned()
            .collect::<HashMap<String, String>>();
        
        // do something with the form data
        println!("{:?}", body_params);

        // send back a response
        *res.body_mut() = Body::from("Form submitted successfully!");

        res.headers_mut().insert(
            CONTENT_TYPE,
            HeaderValue::from_static("text/plain"),
        );
    } else {
        *res.status_mut() = hyper::StatusCode::NOT_FOUND;
    }

    Ok(res)
}

#[tokio::main]
async fn main() {
    let addr = ([127, 0, 0, 1], 3000).into();

    let make_svc = make_service_fn(|_conn| async {
        Ok::<_, hyper::Error>(service_fn(handle_request))
    });

    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 the code above, we create a server that listens on localhost:3000 for incoming requests. The handle_request function reads the request body as form data and does something with the data. The main function sets up the server and starts listening for incoming requests.

Note that in order to use the hyper crate, you'll need to add it as a dependency in your Cargo.toml file.

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