Added comment

src/app/core/auth/auth-request.service.ts

@@ -16,12 +16,6 @@ export class AuthRequestService extends HALEndpointService {
   protected linkName = 'authn';
   protected browseEndpoint = '';
 
-  /**
-   * True if authenticated
-   * @type
-   */
-  private _authenticated = false;
-
   constructor(protected responseCache: ResponseCacheService,
               protected requestService: RequestService,
               @Inject(GLOBAL_CONFIG) protected EnvConfig: GlobalConfig) {
@@ -31,6 +25,7 @@ export class AuthRequestService extends HALEndpointService {
   protected fetchRequest(request: RestRequest): Observable<any> {
     const [successResponse, errorResponse] = this.responseCache.get(request.href)
       .map((entry: ResponseCacheEntry) => entry.response)
+      // TODO to review when https://github.com/DSpace/dspace-angular/issues/217 will be fixed
       .do(() => this.responseCache.remove(request.href))
       .partition((response: RestResponse) => response.isSuccessful);
     return Observable.merge(

src/app/core/auth/auth.service.ts

@@ -1,7 +1,7 @@
 import { Injectable } from '@angular/core';
 
 import { Observable } from 'rxjs/Observable';
-import { filter, map, withLatestFrom } from 'rxjs/operators';
+import { map, withLatestFrom } from 'rxjs/operators';
 
 import { Eperson } from '../eperson/models/eperson.model';
 import { AuthRequestService } from './auth-request.service';
@@ -20,6 +20,7 @@ import { Router } from '@angular/router';
 import { CookieAttributes } from 'js-cookie';
 
 export const LOGIN_ROUTE = '/login';
+
 /**
  * The auth service.
  */
@@ -202,7 +203,7 @@ export class AuthService {
   }
 
   /**
-   * Check if a token is about to expire
+   * Check if a token is next to be expired
    * @returns {boolean}
    */
   public isTokenExpiring(): Observable<boolean> {
@@ -226,6 +227,7 @@ export class AuthService {
     const token = this.getToken();
     return token && token.expires < Date.now();
   }
+
   /**
    * Save authentication token info
    *

src/app/core/data/request.service.ts

@@ -67,6 +67,7 @@ export class RequestService {
       .flatMap((uuid: string) => this.getByUUID(uuid));
   }
 
+  // TODO to review "overrideRequest" param when https://github.com/DSpace/dspace-angular/issues/217 will be fixed
   configure<T extends CacheableObject>(request: RestRequest, overrideRequest: boolean = false): void {
     if (request.method !== RestRequestMethod.Get || !this.isCachedOrPending(request) || overrideRequest) {
       this.dispatchRequest(request, overrideRequest);