Random URL Fetcher Web Application

This function creates a simple Tornado web application that can randomly access a predefined list of URLs and writes the URL of the received response to the client upon receiving it.

Technology Stack : Tornado, HTTPClient

Code Type : Web Application

Code Difficulty : Intermediate

                
                    
import tornado.ioloop
import tornado.web
import tornado.httpclient
import random

def fetch_random_url():
    urls = [
        "http://example.com",
        "http://jsonplaceholder.typicode.com/todos/1",
        "http://api.github.com/repos/tornado/tornado/issues"
    ]
    client = tornado.httpclient.HTTPClient()
    future = client.fetch(random.choice(urls))
    return future

class MainHandler(tornado.web.RequestHandler):
    def get(self):
        future = fetch_random_url()
        future.add_done_callback(self.on_fetch_done)

    def on_fetch_done(self, future):
        response = future.result()
        self.write("Fetched URL: " + response.request.url)
        self.finish()

def make_app():
    return tornado.web.Application([
        (r"/", MainHandler),
    ])