It allows developers to collect external data, post to it, and more. The HttpClient is a lightweight, easy-to-use, and robust HTTP client library. Migration to Angulars new HttpClient is super straight-forward for the most common use cases: HttpModule is superseded by HttpClientModule and Http by. This PostsService class is responsible for making HTTP request to the APIs and transforming the response data according to the components. The HttpClient service class in angular/common/http provides an Angular application with an HTTP client API. Next, create a service class which shall provide us with Posts related functionalities for the requesting components. Once included, we can now access the HttpClient service in all the Components and Services local to that Module. To begin with, we add the HttpClientModule to the list of imports in our Module class.

To do this, we use the HttpClient package for working with API requests. The core feature of this application is showing the post list, which obviously requires the application to fetch data from a remote API. Angular 6 deprecated the old HTTP client in favor of the newer HttpClient module which is an improved version of the Http client API that lives in the angular/common/http package. 'Angular facilitates making HTTP calls to APIs using its HttpClient library which is a part of the package.'Ĭonsider the SocialApp which displays a list of Posts created by various Users and enables one to interact with it. Instead, it makes requests to a server-side WeatherForecast API which encapsulates the business or data logic using which it reads from the underlying database or domain systems and returns appropriate Weather data to the application, which then applies its own features and presents to the user. The response from the HttpClient is observable, so it needs to be subscribed. The HTTP Client makes use of the RxJs Observables. This is a replacement for the old HttpModule.

This new API is available in the package angular/common/http. Angular provides a separate module, HttpClientModule and a service. The Angular HTTP client module is firstly introduced in the Angular 4.3 version. With this in mind, Angular Team provides extensive support to access HTTP server.

Nowadays, lot of application exposes their functionality through REST API (functionality over HTTP protocol). Single Page Applications often rely on HTTP requests for requesting data from APIs through which they operate on the data fetched into powerful presentation logic or front-end transformations.įor example, a Weather application built on a front-end technology such as Angular itself doesn’t access the backend databases or domain systems for data it shows. Http client programming is a must needed feature in every modern web application.

Angular http client