refactor to use caching interceptor

src/app/http-interceptors/index.ts

@@ -1,8 +1,12 @@
 /* "Barrel" of Http Interceptors */
 import { HTTP_INTERCEPTORS } from '@angular/common/http';
-import { CSRFInterceptor } from './csrf-intercepor';
+
+import { CSRFInterceptor } from './csrf.interceptor';
+import { CachingInterceptor } from './caching.interceptor';
 
 /** Http interceptor providers in outside-in order */
 export const httpInterceptorProviders = [
+    { provide: HTTP_INTERCEPTORS, useClass: CachingInterceptor, multi: true },
+    // CSRFInterceptor needs to be last 
     { provide: HTTP_INTERCEPTORS, useClass: CSRFInterceptor, multi: true },
 ];