Download a File Asynchronously From Web And Serve to Download Using Python Tornado Framework

download_with_tornado.py

import asyncio
import tornado
from tornado import gen
from tornado.httpclient import AsyncHTTPClient

class MainHandler(tornado.web.RequestHandler):
    @gen.coroutine
    def get(self):
        url = self.get_argument('url')
        filename = self.get_argument('filename')
        self.set_header('Content-Type', 'application/octet-stream')
        self.set_header('Content-Disposition', 'attachment; filename=%s' % filename)

        self.flush()
        response = yield AsyncHTTPClient().fetch(url)
        self.finish(response.body)

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

async def main():
    app = make_app()
    app.listen(8888)
    await asyncio.Event().wait()


if __name__ == '__main__':
    asyncio.run(main())