Using Charles to catch http2 request failed

[OnlyThen]

Dose httpx support https proxy now?
My test code just lick that:

proxies = {
    "http://": "http://127.0.0.1:8888",
    "https://": "https://127.0.0.1:8888", # "http://127.0.0.1:8888"
}

context = httpx.create_ssl_context(verify="/Users/onlythen/Documents/Charles.pem")

client = httpx.Client(http2=True, verify=context, proxies=proxies)  # (http2=True) this will work fine
headers = {
    'Host': 'pixabay.com',
    'upgrade-insecure-requests': '1',
    'user-agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.121 Safari/537.36',
    'accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9',
    'sec-fetch-site': 'none',
    'sec-fetch-mode': 'navigate',
    'sec-fetch-dest': 'document',
    'accept-language': 'zh-CN,zh;q=0.9'
}

response = client.get('https://pixabay.com/images/search/cat/', headers=headers)
if response.status_code == 200:
    print(response.text)
print(response.http_version)

After open charles and start proxy, those code will show ssl error:

do_handshake
    self._sslobj.do_handshake()
ssl.SSLError: [SSL: WRONG_VERSION_NUMBER] wrong version number (_ssl.c:1125)

During handling of the above exception, another exception occurred:

And in charles it show status code 503: Invalid first line in request.