Using JSON web services
In this section, we code a web server that communicates with our clients and runs the todo app; the todo data is sent to and from the web server in the JSON string format.
Spiral s06 consists of a server and a client part. To run it, first start the server (lib/server/server.dart) in Dart Editor or from the console; it runs when you see in the server.dart tab in Dart Editor: Listening for GET and POST on http://127.0.0.1:8080.
(If it does not run, navigate to Run | Manage Launches.) Then start one or more clients (web/app.html) in Dartium. Locally, the client still saves the data in IndexedDB. Our screen has two new buttons:
- To server: The client converts the the data to the JSON format and sends it to the server, where the data is stored in the main memory (post data to server)
- From server: An another client (on a different machine) can request the server data to update its local database (get data from server)
Server communication in Spiral s06
The following is the...
