Cloudflare Workers (Rust, workers-rs) Rust

// src/lib.rs
use worker::*;

const GIF: &[u8] = &[0x47, 0x49, 0x46, 0x38, 0x39, 0x61, 0x01, 0x00, 0x01, 0x00, 0x80, 0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x21, 0xf9, 0x04, 0x01, 0x00, 0x00, 0x00, 0x00, 0x2c, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x02, 0x02, 0x44, 0x01, 0x00, 0x3b];

#[event(fetch)]
async fn fetch(req: Request, _env: Env, _ctx: Context) -> Result<Response> {
    if req.path() != "/pixel.gif" {
        return Response::error("Not Found", 404);
    }
    let headers = Headers::new();
    headers.set("Content-Type", "image/gif")?;
    headers.set("Cache-Control", "no-store")?;
    Ok(Response::from_bytes(GIF.to_vec())?.with_headers(headers))
}