Hands-On Microservices with Rust

Matching expressions

We have to reorganize the code of microservice_handler because we can't use regular expressions in a match expression. We have to extract the method with the path at the start, because we need it for most responses:

let response = {    let method = req.method();    let path = req.uri().path();    let mut users = user_db.lock().unwrap();    // Put regular expressions here};futures::ok()

The first thing we'll check is the index page requests. Add the following code:

if INDEX_PATH.is_match(path) {    if method == &Method::GET {        Response::new(INDEX.into())    } else {        response_with_code(StatusCode::METHOD_NOT_ALLOWED)    }

This uses the INDEX_PATH regular expression to check whether the request's path matches the index page request using the  ...