Spin (Rust, WASI HTTP component) Rust

// src/lib.rs; spin.toml routes it: [[trigger.http]] route = "/pixel.gif", component = "pixel"
use spin_sdk::http::{FullBody, IntoResponse, Request, Response};
use spin_sdk::http_service;

static 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];

#[http_service]
async fn pixel(_req: Request) -> impl IntoResponse {
    Response::builder()
        .header("content-type", "image/gif")
        .header("content-length", GIF.len())
        .header("cache-control", "no-store")
        .body(FullBody::new(GIF))
        .unwrap()
}