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Mastering Mobile Application Development with Ionic

Loading Data

Explore how to load and post data asynchronously using Angular's HttpClient service in Ionic apps. Understand the use of HTTP methods like GET and POST, the role of Observables for handling asynchronous requests, and how to integrate remote data services. Learn best practices for importing HttpClientModule and managing data retrieval and submission for effective mobile app development.

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Angular and HTTP methods

Angular’s HttpClient service allows developers to perform asynchronous requests using the following methods (all of which return an Observable):

  • The request method accepts any type of HTTP method, like, GET, POST, and so on.
  • The get method retrieves any information identified by the URI.
  • The post method is usually used to create a new resource, like posting data to be added to a remote database.
  • The put method is most often used to update existing resources, like posting data to update a current record in a remote database.
  • The delete method is generally used to remove an existing resource, such as removing a remote database record.
  • The patch method is used to make changes to a resource, not the complete resource itself.
  • The head method is identical to the HTTP GET method except the server must not return a message-body in the response.
  • The options method requests information about available communication options when communicating with a specific resource.

The more seasoned developers will undoubtedly have noticed that these Angular ...