import aiohttp
import aiohttp.web
import asyncio


async def server(loop):
	app = aiohttp.web.Application(loop=loop)
	app.router.add_get('/a-b', lambda _: aiohttp.web.Response(text="OK"))
	app.router.add_get('/a:b', lambda _: aiohttp.web.Response(text="nope"))
	app.router.add_get('/a%3Ab', lambda _: aiohttp.web.Response(text="still nope"))
	handler = app.make_handler()
	await loop.create_server(handler, '0.0.0.0', 8080)

async def main(loop):
	srv = await server(loop)
	async with aiohttp.get('http://0.0.0.0:8080/a-b') as resp:
		print('--->', resp.status)
	async with aiohttp.get('http://0.0.0.0:8080/a:b') as resp:
		print('--->', resp.status)
	async with aiohttp.get('http://0.0.0.0:8080/a%3Ab') as resp:
		print('--->', resp.status)

loop = asyncio.get_event_loop()
loop.run_until_complete(main(loop))