Rocket: Request guard numbers

examples/rocket/request-guard-numbers/Cargo.toml

[package]
name = "request-guard-numbers"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
rocket = "0.5.0"

examples/rocket/request-guard-numbers/src/main.rs

#[macro_use]
extern crate rocket;

use rocket::response::content;

struct Guess {
    guess: 
}

#[get("/")]
fn index() -> content::RawHtml<&'static str> {
    content::RawHtml(r#"
    <form action="/check">
    <input name="guess">
    <input type="submit" value="Try">
    "#)
}

#[get("/check?<guess>")]
fn check(guess: u32) -> content::RawHtml<String> {
    content::RawHtml(format!("The guess was: {guess}"))
}

#[catch(422)]
fn not_processed() -> content::RawHtml<&'static str> {
    content::RawHtml("This is a 422 errror")
}


#[launch]
fn rocket() -> _ {
    rocket::build()
    .mount("/", routes![index, check])
    .register("/", catchers![not_processed])
}

#[cfg(test)]
mod tests;

examples/rocket/request-guard-numbers/src/tests.rs

use rocket::http::Status;
use rocket::local::blocking::Client;

#[test]
fn hello_world() {
    let client = Client::tracked(super::rocket()).unwrap();
    let response = client.get("/").dispatch();

    assert_eq!(response.status(), Status::Ok);
    assert_eq!(
        response.headers().get_one("Content-Type").unwrap(),
        "text/plain; charset=utf-8"
    );
    assert_eq!(response.into_string(), Some("Hello, world!".into()));
}