.http Files in Visual Studio

An .http file holds requests written as plain text, one after another, separated by ###. Visual Studio sends each one with a click and shows the response's status, headers and body, so you can test an API without leaving your project.

Updated

Cheat sheet: .http Files in Visual Studio
Category
Developer Tools
Level
Journeyman
Tags
.http File, aspnet-core, Content-Type, Location Header, rest-api