How to disable caching with HttpClient get in Angular 6

Question

I\'m writing an Angular SPA app, that uses HttpClient to get values from my backend.

What is the easy way to tell it not to cache? The first time I ask it gets the v

Answer 1

HTTPInterceptors are great way to modify HTTP requests occurring in your application. It acts as an injectable service that can invoke when HttpRequest occurs.

HTTP Interceptor:

import { Injectable } from '@angular/core';
import { HttpInterceptor, HttpRequest, HttpHandler, HttpHeaders } from '@angular/common/http';

@Injectable()
export class CacheInterceptor implements HttpInterceptor {

  intercept(req: HttpRequest, next: HttpHandler) {
    const httpRequest = req.clone({
      headers: new HttpHeaders({
        'Cache-Control': 'no-cache',
        'Pragma': 'no-cache',
        'Expires': 'Sat, 01 Jan 2000 00:00:00 GMT'
      })
    });

    return next.handle(httpRequest);
  }
}

Using Interceptor:

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule } from '@angular/forms';

import { AppComponent } from './app.component';

import { HttpClientModule, HTTP_INTERCEPTORS } from '@angular/common/http';
import { CacheInterceptor } from './http-interceptors/cache-interceptor';

@NgModule({
  imports:      [ BrowserModule, FormsModule ],
  declarations: [ AppComponent ],
  bootstrap:    [ AppComponent ],
  providers: [
    { provide: HTTP_INTERCEPTORS, useClass: CacheInterceptor, multi: true }
  ]
})
export class AppModule { }