headers.getAll() overload and get all sent headers (with browser defaults) inside HTTP_INTERCEPTORS

I’m submitting a…

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[ ] Performance issue
[X] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question
[ ] Other... Please describe:

Current behavior

• Does not get all headers with .headers.getAll().
• Does not get all default headers sent when request.headers accessed from enum.sent

Expected behavior

• Get all headers with .headers.getAll(). Add overload for the same when arguments not provided. Proposal to add .getAll() method overload to get all headers at once.
• Get all default headers sent when request.headers accessed from enum.sent. Proposal to add all sent headers even browser default headers that can be all fetched with .getAll() overload.

Minimal reproduction of the problem with instructions

https://stackblitz.com/edit/angular-gitter-dygdrc?file=app%2Finterceptor.service.ts

intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    console.log('Request', request.headers.keys());
    // Proposal to add .getAll() method overload to get all headers at once when no args are provided
    return next
      .handle(request).pipe(
        tap((ev: HttpEvent<any>) => {
          if (ev.type === HttpEventType.Sent) {
            console.log('ReqAfterSent', request.headers);
            // Proposal to add all sent headers even browser default headers that can be all fetched with .getAll() overload
          }
        })
      );
  }

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

Application use case when working just with headers.

Environment

Angular CLI: 6.1.4 Node: 10.7.0 OS: linux x64 Angular: 6.1.4 … animations, cli, common, compiler, compiler-cli, core, forms … http, language-service, platform-browser … platform-browser-dynamic, router

Package Version

@ angular-devkit/architect 0.7.4 @ angular-devkit/build-angular 0.7.4 @ angular-devkit/build-optimizer 0.7.4 @ angular-devkit/build-webpack 0.7.4 @ angular-devkit/core 0.7.4 @ angular-devkit/schematics 0.7.4 @ angular/cdk 6.4.6 @ angular/material 6.4.6 @ ngtools/webpack 6.1.4 @ schematics/angular 0.7.4 @ schematics/update 0.7.4 rxjs 6.2.2 typescript 2.7.2 webpack 4.9.2

Browser:

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

For Tooling issues: na

Others: NA

[alxhub]

This is an interesting idea - the Sent event could deliver information about the actually sent request, including headers if requested. I’ll think about this.

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