You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main.rs
    path of file: ./repos/dapr-wasm/image-api-grayscale/src
    
    the code of the file until where you have to start completion: use hyper::service::{make_service_fn, service_fn};
use hyper::{Body, Method, Request, Response, StatusCode, Server};
use hyper::header::*;
use std::convert::Infallible;
use std::net::SocketAd
    
async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
    let addr = SocketAddr::from(([0, 0, 0, 0], 9005));
    let make_svc = make_service_fn(|_| {
        async move {
            Ok::<_, Infallible>(service_fn(move |req| {
                grayscale(req)
            }))
        }
    });
    let server = Server::bind(&addr).serve(make_svc);
    if let Err(e) = server.await {
        eprintln!("server error: {}", e);
    }
    Ok(())
}