Result<RawJavaScript<String>, std::io::Error> and NamedFile does not return application/javascript as Content-Type

[LuckyTurtleDev]

Description Result<RawJavaScript<String>, std::io::Error> does return text/html instead of application/javascript. Similarly behavior for NamedFile does also return text/html.

To Reproduce

#[get("/widget-api.js")]
async fn widget_api_js() -> std::io::Result<NamedFile> {
    NamedFile::open("widget-api.js").await
}

#[get("/index.js")]
async fn index_js() -> Result<RawJavaScript<String>, std::io::Error> {
    match read_to_string("index.js").await {
        Err(error) => Err(error),
        Ok(value) => Ok(RawJavaScript(value))
    }
}

#[launch]
async fn rocket() -> _ {
    let shield = Shield::default().disable::<rocket::shield::Frame>();
    rocket::build().mount("/", routes![index_js,widget_api_js]).attach(Template::fairing()).attach(shield)
}

Expected Behavior

Return application/javascript for booth routs

Environment:

 ██████████████████  ████████   ***@***
██████████████████  ████████   ------------
██████████████████  ████████   OS: Manjaro Linux x86_64
██████████████████  ████████   Host: 82N7 Yoga 7 14ACN6
████████            ████████   Kernel: 5.19.0-2-MANJARO
████████  ████████  ████████   Uptime: 1 hour, 36 mins
████████  ████████  ████████   Packages: 1633 (pacman)
████████  ████████  ████████   Shell: bash 5.1.16
████████  ████████  ████████   Resolution: 1920x1200
████████  ████████  ████████   DE: Plasma 5.24.6
████████  ████████  ████████   WM: kwin
████████  ████████  ████████   Theme: [Plasma], Adapta-Nokto-Eta-Maia [GTK3]
████████  ████████  ████████   Icons: Papirus-Dark-Maia [Plasma], Papirus-Dark-Maia [GTK2/3]
████████  ████████  ████████   Terminal: alacritty
                               CPU: AMD Ryzen 7 5800U with Radeon Graphics (16) @ 1.900GHz
                               GPU: AMD ATI 03:00.0 Cezanne
                               Memory: 6847MiB / 13832MiB

[[package]]
name = "rocket"
version = "0.5.0-rc.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "98ead083fce4a405feb349cf09abdf64471c6077f14e0ce59364aa90d4b99317"
dependencies = [
 "async-stream",
 "async-trait",
 "atomic",
 "atty",
 "binascii",
 "bytes",
 "either",
 "figment",
 "futures",
 "indexmap",
 "log",
 "memchr",
 "multer",
 "num_cpus",
 "parking_lot",
 "pin-project-lite",
 "rand",
 "ref-cast",
 "rocket_codegen",
 "rocket_http",
 "serde",
 "state",
 "tempfile",
 "time",
 "tokio",
 "tokio-stream",
 "tokio-util",
 "ubyte",
 "version_check",
 "yansi",
]

[LuckyTurtleDev]

same behavior for RawJavaScript<String> (without result)

[LuckyTurtleDev]

Sorry I have use wrong url and rocket has return the default error message.