Angular 4.3 HTTPClient API
In the 4.3 release of Angular, there was a new HttpClient API introduced. HttpClient is an alternative to the existing Http module and exists in its own package (@angular/common/http). For any projects that are using Angular 4.x, both Http and HttpClient are supported so you don’t have to migrate to the HttpClient all at once. However, in Angular 5x, the original HttpModule is deprecated so only HttpClient is supported. Hopefully with this overview you will see that HttpClient is actually easier to use and switching from Http will simplify your http service calls. Read more