How to add multiple headers in Angular 5 HttpInterceptor

Question

I\'m trying to learn how to use HttpInterceptor to add a couple of headers to each HTTP request the app do to the API. I\'ve got this interceptor:

Answer 1

I have tried following ways to send custom headers using interceptors. please check the link stackBlitz

Please refer the console screenshot for your reference browser console-request header

And the custom headers are added in

access-control-request-headers:authkey,content-type,deviceid

I want the headers to be added as part of header, not inside access-control-request-headers. Please suggest me on this