Implementing Web Requests - (Kivy Networking)

Kivy is a Python framework for building multi-touch applications. It includes various components like graphics engine, audio engine, touch event support, etc. In this tutorial, we will learn how to implement web requests in Kivy.

Syntax

kivy.network.urlrequest.URLRequest(url, on_success=None, on_failure=None, on_redirect=None, on_progress=None, req_headers={}, **kwargs)

Parameters:

• url (str) – Address of the webpage where the request is to be sent.
• on_success – Function to be called after a successful response.
• on_failure – Function to be called after a failure in the request.
• on_redirect – Function to be called after a redirect in the request.
• on_progress – Function to be called while request is in progress.
• req_headers (dict) – Dictionary of additional request headers.

Example

from kivy.network.urlrequest import UrlRequest

def on_success(req, result):
    print("Response:", result)

def on_failure(req, result):
    print("Request failed")

def make_request():
    UrlRequest(
        'http://jsonplaceholder.typicode.com/todos/1',
        on_success=on_success,
        on_failure=on_failure,
    )

Output

Response: {'userId': 1, 'id': 1, 'title': 'delectus aut autem', 'completed': False}

Explanation

In the above example, we have imported the UrlRequest class from the kivy.network.urlrequest module. We have created two functions, on_success and on_failure, which will be called after the request is completed. on_success will be called when the request is successful and on_failure will be called if the request fails.

We then create a UrlRequest instance and pass the URL to it. We also pass the on_success and on_failure functions to it.

Use

The UrlRequest class can be used to make HTTP requests in Kivy applications. It can be used to send GET, POST, PUT, DELETE, and other types of HTTP requests.

Important Points

• The UrlRequest class is asynchronous, which means that it does not block the main thread.
• The on_success and on_failure functions are called on the main thread.
• The req_headers parameter can be used to pass additional headers to the request.

Summary

In this tutorial, we learned how to implement web requests in Kivy using the UrlRequest class. We also learned how to handle successful and failed responses using the on_success and on_failure functions.