import io, urllib.parse
import qrcode
from aiohttp import web

data = params_kw.get('data', '')
if not data:
	return web.Response(status=400, text='missing data')

data = urllib.parse.unquote(data)
img = qrcode.make(data, box_size=10, border=2)
buf = io.BytesIO()
img.save(buf, format='PNG')
buf.seek(0)
return web.Response(body=buf.read(), content_type='image/png')