python: aiohttp

import ssl
import aiohttp

sslcontext = ssl.create_default_context(cafile='/path_to_client_root_ca')
sslcontext.load_cert_chain(certfile=cert_file, keyfile=client_key)
conn = aiohttp.TCPConnector(ssl_context=sslcontext)

async with aiohttp.ClientSession(connector=conn) as session:
    pass

async with aiohttp.ClientSession() as session:
    async with session.get('https://api.github.com/events') as resp:
        print(resp.status)
        print(await resp.text())

async with aiohttp.request('GET', 'https://api.github.com/events') as resp:
        json = await resp.json()
        print(json)