Angular 15 HttpClient & Http Services Tutorial

In Angular 15, the HttpClient and Http services are used for making HTTP requests to a server. The HttpClient service is a more powerful and flexible version of the Http service, and it is recommended to use it for all new projects.

Here’s an example of how you might use the HttpClient service to make a GET request to a server:

Copy codeimport { HttpClient } from '@angular/common/http';

export class MyComponent {
  constructor(private http: HttpClient) {}

  getData() {
    this.http.get('/api/data').subscribe(data => {
      console.log(data);
    });
  }
}

In this example, the MyComponent class imports the HttpClient service, and the http property is initialized in the constructor. The getData method then uses the http.get method to make a GET request to the /api/data endpoint, and the response data is logged to the console.

You can also use the http.post, http.put, http.patch and http.delete methods to make POST, PUT, PATCH and DELETE requests respectively. Here’s an example of how you might use the http.post method to make a POST request:

Copy codeimport { HttpClient } from '@angular/common/http';

export class MyComponent {
  constructor(private http: HttpClient) {}

  createData(newData) {
    this.http.post('/api/data', newData).subscribe(data => {
      console.log(data);
    });
  }
}

The HttpClient service also supports request options, headers, and interceptors, which can be used for advanced configuration of the requests. The HttpClient also includes other features such as error handling, handling of the response type, and handling of the response body.

You can also use the Http service in Angular 15 as well, but it’s recommended to use HttpClient as it’s more powerful and flexible. The Http service can still be used to make HTTP requests, but it’s functionality is limited as compared to HttpClient.

It’s important to note that Angular 15 also has a built-in mechanism for handling errors and retrying failed requests, known as the “error handling and retry logic”.

With this brief tutorial, you should now have a basic understanding of how to use the HttpClient and Http services in Angular 15 to make HTTP requests to a server.