gistfile1.txt

import {Injectable} from "@angular/core";
import {HttpEvent, HttpHandler, HttpInterceptor} 
     from "@angular/common/http";
import {HttpRequest} from "@angular/common/http";
import {Observable} from "rxjs/Observable";

@Injectable()
export class AuthInterceptor implements HttpInterceptor {
    
    constructor(private authService: AuthService) {
    }

    intercept(req: HttpRequest<any>, 
               next: HttpHandler):Observable<HttpEvent<any>> {
        
        const inComingRequest = req.clone({
            headers: req.headers.set(
                'X-CustomAuthHeader', 
                authService.getToken())
        });
        console.log("new headers", inComingRequest.headers.keys());
        return next.handle(inComingRequest);
    }
}