Delay Response with Hapi 18.1 - hapi.js

Question

How can I set a delay in response using Hapi 18.1, I want to see hour glass spinning if API response is slow. With earlier versions I used setTimeout() like below.
server.route({
method: 'GET',
path:'/hello',
handler: (request, h) => {
setTimeout(() => reply('Hello World!'), 1000);
}
});
But v18.1 is throwing an error
server.route({
method: 'GET',
path:'/hello',
handler: (request, h) => {
setTimeout(() => h.response('Hello World!'), 1000);
}
});
Error
Debug: internal, implementation, error
Error: get method did not return a value, a promise, or throw an error
at module.exports.internals.Manager.execute (C:\Users\javakb\workspace\node_modules\hapi\lib\toolkit.js:48:29)
at processTicksAndRejections (internal/process/task_queues.js:85:5)
at async Object.internals.handler (C:\Users\javakb\workspace\node_modules\hapi\lib\handler.js:46:20)
at async exports.execute (C:\Users\javakb\workspace\node_modules\hapi\lib\handler.js:31:20)
at async Request._lifecycle (C:\Users\javakb\workspace\node_modules\hapi\lib\request.js:312:32)
at async Request._execute (C:\Users\javakb\workspace\node_modules\hapi\lib\request.js:221:9)
Any help is appreciated.

Answer 1

Hapi 18 expects it's route handlers to return the response or a promise that resolves to
a response. Your code isn't doing that. This can be fixed by simply returning a promise that resolves to the response after waiting 1 second.
Example
server.route({
method: 'GET',
path: '/',
handler: (request, h) => {
return new Promise((resolve, reject) => {
setTimeout(() => {
resolve(h.response('Hello World!'));
}, 1000);
});
}
});