Specify a default 404 file

Can we get an option to set a 404 file for requests that 404? It can definitely default to false, but if set to a file path then serve that file path in the body. This would be especially helpful for almost static sites being run by koa and koa middleware.

[michielbdejong]

FWIW, not sure if this is the best answer, but I got this working with:

const Koa = require("koa");
const koaSend = require("koa-send");
const koaStatic = require("koa-static");

const app = new Koa();
app.use(koaStatic("./public/", {}));
app.use(async ctx => {
  if (ctx.status === 404) {
    await koaSend(ctx, "index.html", { root: "./public/" });
  }
});
app.listen(3000);

[mashhoodr]

@silenceisgolden can you please share the middleware you wrote for this, did you use koa-send to manually send serve the files on 404?