How can we add new header key value in http request #503

I'm submitting a...

• Regression (a behavior that used to work and stopped working in a new release)
• Bug report
• Performance issue
• Feature request
• Documentation issue or request
• Other... Please describe:

Current behavior

Expected behavior

What is the motivation / use case for changing the behavior?

Environment

Angular-Token version: X.Y.Z
Angular version: X.Y.Z

Bundler

• Angular CLI (Webpack)
• Webpack
• SystemJS

Browser:

• Chrome (desktop) version XX
• Chrome (Android) version XX
• Chrome (iOS) version XX
• Firefox version XX
• Safari (desktop) version XX
• Safari (iOS) version XX
• IE version XX
• Edge version XX

Others: