1: Create a public folder in the root directory.

2: If you want to get one single file, put it in public folder root and give the url as localhost:4000/file/< filename >

3: If you want to get a random file each time, upload your folder in public folder and give the url as localhost:4000/list/< foldername >

4: In either case, if you want to add a delay to your response append the query param, delay=1000

Example: localhost:4000/file/testimage.jpg?delay=1000 => this will look for file called testimage.jpg inside public folder and return it with a delay of 1000ms.

Example: localhost:4000/list/testimages?delay=2000 => this will look for a folder called testimages inside public folder and return files randomly from it with a delay of 2000ms.