Request defaults, use a function as default header

Question

When using the NPM request module's request.defaults API, does anyone know of anyway in which I can pass a function as a request header, so that the function's result becomes the header value everytime I make an outgoing request?

i.e.

request.defaults({
    headers:{datestamp:() => new Date()
})

Answer 1

It works with a getter method. You also need to use the instance returned from .defaults.

const Request = require('request');
const request = Request.defaults({
    headers: {
        get timestamp() { return new Date(); }
    }
})
request.get('/foo', ...);