fix issue where interceptors were executed multiple times for each request

src/app/app.module.ts

@@ -1,5 +1,5 @@
 import { APP_BASE_HREF, CommonModule } from '@angular/common';
-import { HttpClientModule } from '@angular/common/http';
+import { HttpClientModule, HTTP_INTERCEPTORS } from '@angular/common/http';
 import { APP_INITIALIZER, NgModule } from '@angular/core';
 
 import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
@@ -40,6 +40,8 @@ import { BreadcrumbsComponent } from './breadcrumbs/breadcrumbs.component';
 import { environment } from '../environments/environment';
 import { BrowserModule } from '@angular/platform-browser';
 import { ForbiddenComponent } from './forbidden/forbidden.component';
+import { AuthInterceptor } from './core/auth/auth.interceptor';
+import { LocaleInterceptor } from './core/locale/locale.interceptor';
 
 export function getBase() {
   return environment.ui.nameSpace;
@@ -94,6 +96,18 @@ const PROVIDERS = [
     deps: [ Store ],
     multi: true
   },
+  // register AuthInterceptor as HttpInterceptor
+  {
+    provide: HTTP_INTERCEPTORS,
+    useClass: AuthInterceptor,
+    multi: true
+  },
+  // register LocaleInterceptor as HttpInterceptor
+  {
+    provide: HTTP_INTERCEPTORS,
+    useClass: LocaleInterceptor,
+    multi: true
+  },
   ...DYNAMIC_MATCHER_PROVIDERS,
 ];
 

src/app/core/core.module.ts

@@ -1,5 +1,5 @@
 import { CommonModule } from '@angular/common';
-import { HTTP_INTERCEPTORS, HttpClient } from '@angular/common/http';
+import { HttpClient } from '@angular/common/http';
 import { ModuleWithProviders, NgModule, Optional, SkipSelf } from '@angular/core';
 
 import {
@@ -32,7 +32,6 @@ import { SidebarService } from '../shared/sidebar/sidebar.service';
 import { UploaderService } from '../shared/uploader/uploader.service';
 import { SectionFormOperationsService } from '../submission/sections/form/section-form-operations.service';
 import { AuthRequestService } from './auth/auth-request.service';
-import { AuthInterceptor } from './auth/auth.interceptor';
 import { AuthenticatedGuard } from './auth/authenticated.guard';
 import { AuthStatus } from './auth/models/auth-status.model';
 import { BrowseService } from './browse/browse.service';
@@ -132,7 +131,6 @@ import { ProcessDataService } from './data/processes/process-data.service';
 import { ScriptDataService } from './data/processes/script-data.service';
 import { WorkflowActionDataService } from './data/workflow-action-data.service';
 import { WorkflowAction } from './tasks/models/workflow-action-object.model';
-import { LocaleInterceptor } from './locale/locale.interceptor';
 import { ItemTemplateDataService } from './data/item-template-data.service';
 import { TemplateItem } from './shared/template-item.model';
 import { Feature } from './shared/feature.model';
@@ -279,18 +277,6 @@ const PROVIDERS = [
   EndUserAgreementCurrentUserGuard,
   EndUserAgreementCookieGuard,
   EndUserAgreementService,
-  // register AuthInterceptor as HttpInterceptor
-  {
-    provide: HTTP_INTERCEPTORS,
-    useClass: AuthInterceptor,
-    multi: true
-  },
-  // register LocaleInterceptor as HttpInterceptor
-  {
-    provide: HTTP_INTERCEPTORS,
-    useClass: LocaleInterceptor,
-    multi: true
-  },
   NotificationsService,
   FilteredDiscoveryPageResponseParsingService,
   { provide: NativeWindowService, useFactory: NativeWindowFactory },