actix-website/examples/static-files/src/configuration.rs

// <config-one>
use actix_files as fs;
use actix_web::http::header::{ContentDisposition, DispositionType};
use actix_web::{web, App, Error, HttpRequest, HttpServer};

fn index(req: HttpRequest) -> Result<fs::NamedFile, Error> {
    let path: std::path::PathBuf = req.match_info().query("filename").parse().unwrap();
    let file = fs::NamedFile::open(path)?;
    Ok(file
        .use_last_modified(true)
        .set_content_disposition(ContentDisposition {
            disposition: DispositionType::Attachment,
            parameters: vec![],
        }))
}

pub fn main() {
    HttpServer::new(|| App::new().route("/{filename:.*}", web::get().to(index)))
        .bind("127.0.0.1:8088")
        .unwrap()
        .run()
        .unwrap();
}
// </config-one>