Python Requests and SSLContext

I'm trying to figure out how to specify an SSLContext with Request.

I have two functions which in theory should do the same, however the one with Requests doesn't work.

def func_OK(token):
    ctx = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH,cafile='myCA.crt.pem')
    ctx.load_cert_chain(certfile='myprivate.pem')
    url = 'https://my_url.com'
    hdr = {"Content-Type": "application/json","Authorization":"Bearer "+token}
    data = '{"filterList":[{}]}'
    bdata = data.encode('utf-8')
    req = urllib.request.Request(url, headers=hdr)
    resp = urllib.request.urlopen(req, data=bdata, context=ctx)
    content = resp.read()
    data = json.loads(content.decode('utf-8'))

def func_NOK(token):
    import requests
    url = 'https://my_url.com'
    hdr = {"Content-Type": "application/json","Authorization":"Bearer "+token}
    data = '{"filterList":[{}]}'
    bdata = data.encode('utf-8')
    resp = requests.post(url,headers=hdr, data={"filterList":[{}]})

The only the difference between the two functions are the sslContext. In the func_NOK, I try :

1. resp = requests.post(url,headers=hdr, data={"filterList":[{}]}, verify=False) - it doesn't work
2. resp = requests.post(url,headers=hdr, data={"filterList":[{}]}, cert=('myCA.crt.pem','myprivate.pem')) - it doesn't work
3. resp = requests.post(url,headers=hdr, data={"filterList":[{}]}, verify="concat_file.crt") with "concat_file.crt" file a concatenation of 'myCA.crt.pem' and 'myprivate.pem'

In any cases I have an SSL error. For example, on my last example the error msg is :

requests.exceptions.ConnectionError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate in certificate chain (_ssl.c:1131)

I'm just trying to use an SSLContext with Requests.

I solved it using :

requests.post(url,headers=hdr,json={"filterList":[{}]}, cert='myprivate.pem')