Autogenerating the Date Header in Postman

If you're working with APIs there is a chance you may be using Postman to interact with it.

The APIs you're interacting with may require the Date header, to know at what point in time the request has originated. Most HTTP clients, Postman included, will not send this by default, so we need to do a little bit of work to get it sending.

Also, because it's very likely important what date is used, we should generate it each time. Fortunately, we can use Postman's pre-request scripting with its JavaScript support, following [MDN's documentation] to generate a compliant (modern) date format:

pm.globals.set("dateHeader", new Date().toUTCString()); // => Wed, 29 Apr 2020 16:50:34 GMT

Then in Postman, we can reference this variable in our header as {{headerValue}}.