server.ts

import Koa from "koa";

const app = new Koa();

let headers;

app.use(async (ctx) => {
  if (ctx.request.url.startsWith("/img/")) {
    ctx.body = "no image";
    headers = Object.fromEntries(Object.entries(ctx.request.headers));
    return;
  }
  
  console.log(ctx.request.url, ctx.request.method);
  ctx.body = {
    headers,
  };
});

app.listen(7860);