struct CachedFile(NamedFile);

impl<'r> Responder<'r> for CachedFile {
    fn respond_to(self, req: &Request) -> response::Result<'r> {
        let mut response_build = Response::build();
        let nfile_result: Result<Response, Status> = self.0.respond_to(req);
        match nfile_result {
            Ok(nfile_result_response) => {
                response_build = Response::build_from(nfile_result_response);
                response_build.raw_header("Cache-control", "max-age=86400"); //  24h (24*60*60)
            }
            Err(nfile_result_status) => {
                response_build.raw_status(nfile_result_status.code, nfile_result_status.reason);
            }
        }
        response_build.ok()
    }
}

#[get("/resources/<file..>")]
fn files(file: PathBuf) -> Option<CachedFile> {
    NamedFile::open(Path::new("resources/").join(file)).ok().map(|nf| CachedFile(nf))
}