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In Postman you can provide Basic Auth from Authorization tab. There you can add username and password and access the url without a popup coming up.
From your Front End App you need to send an Authorization header.
Authorization: Basic base64Encode(username+":"+password)
base64Encode
is the encode function so that you can convert your testusername:testpassword
to an encoded value and will have something like below.
Authorization: Basic ehdro389erje34903==
Source:stackexchange.com