[Python] requests.Session with client certificates and own CA

Here is my code

os.environ['REQUESTS_CA_BUNDLE'] = os.path.join('/path/to/','ca-own.crt')
s = requests.Session()
s.cert = ('some.crt', 'some.key')

s.get('https://some.site.com')


Last instruction returns:

requests.exceptions.SSLError: HTTPSConnectionPool(host='some.site.com', port=443): Max retries exceeded with url: / (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1131)')))

With curl:

curl --cacert ca-own.crt --key some.key --cert some.crt https://some.site.com

returns normal html code.

How can i make python requests.Session send correct certificates to the endpoint?

P.S. The same situation will be if i add the following

s.verify = 'some.crt'


or

cat some.crt ca-own.crt > res.crt

s.verify = 'res.crt'


P.P.S.

cat some.crt some.key > res.pem

s.cert = "res.pem"


requests.exceptions.SSLError: HTTPSConnectionPool(host='some.site.com', port=443): Max retries exceeded with url: / (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1131)')))

cat ca-own.crt some.crt some.key > res.pem

s.cert = "res.pem"


requests.exceptions.SSLError: HTTPSConnectionPool(host='some.site.com', port=443): Max retries exceeded with url: / (Caused by SSLError(SSLError(116, '[X509: KEY_VALUES_MISMATCH] key values mismatch (_ssl.c:4067)')))

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