Handler

A handler can be:

• A function

  const handler = (ctx) => {};

• A Promise (async (ctx) => ...)

  const handler = async (ctx) => {};

• A function/Promise returning data

  const handler = () => new TextBody("...");

• A router (new Router())

  const handler = new Router();

• A list of handlers ([middleware, (ctx) => ..., router])

  const handler = [

  myMiddleware1,

  myMiddleware2,

  myMiddleware3,

  (ctx) => {},

  myRouter,

  async (ctx) => {},

  ];