I can run from the command line:
kubectl exec secret-pod --namespace=production cat data/busybox/password
and
kubectl exec secret-pod --namespace=production cat data/busybox/username
and they are working successfully

But when I run the following code in python
I get
"Upgrade request required"
def _get_user_token(self):
user=''
passwd=''
name = 'secret-pod'
namespace = 'production'
exec_cmd = ['cat /data/busybox/username']

    try:
        user = self.core_api_instance.connect_get_namespaced_pod_exec(name="secret-pod",
                                                                      namespace="production",
                                                                      command=["cat /data/busybox/username"],
                                                                      stderr=True, stdin=False,
                                                                      stdout=True, tty=False)
        pprint(user)
    except ApiException as e:
        print("Exception when calling CoreV1Api->get_namespaced_pod_exec: %s\n" % e)

    exec_cmd = ['cat /data/busybox/password']
    try:
        passwd = self.core_api_instance.connect_get_namespaced_pod_exec(name="secret-pod",
                                                                        namespace='production',
                                                                        command=["cat /data/busybox/password"],
                                                                        stderr=True, stdin=False,
                                                                        stdout=True, tty=False)
        pprint(passwd)
    except ApiException as e:
        print("Exception when calling CoreV1Api->get_namespaced_pod_exec: %s\n" % e)

    return {'user': user, 'password': passwd}

Full error messages
send: 'GET /api/v1/namespaces/production/pods/secret-pod/exec?command=%5B%27cat+%2Fdata%2Fbusybox%2Fusername%27%5D&stderr=True&stdin=False&stdout=True&tty=False HTTP/1.1\r\nHost: 192.168.42.218:8443\r\nAccept-Encoding: identity\r\nContent-Type: application/json\r\nauthorization: Bearer heoJMu0hqlrLWNJ2lV9MsaIWp1kPuKvwPhmhcmj9-Kg\r\nAccept: /\r\nUser-Agent: Swagger-Codegen/4.0.0/python\r\n\r\n'
reply: 'HTTP/1.1 400 Bad Request\r\n'
header: Cache-Control: no-store
header: Content-Type: application/json
header: Date: Mon, 30 Apr 2018 19:50:05 GMT
header: Content-Length: 139
2018-04-30 15:50:05,528 DEBUG https://192.168.42.218:8443 "GET /api/v1/namespaces/production/pods/secret-pod/exec?command=%5B%27cat+%2Fdata%2Fbusybox%2Fusername%27%5D&stderr=True&stdin=False&stdout=True&tty=False HTTP/1.1" 400 139
Exception when calling CoreV1Api->get_namespaced_pod_exec: (400)
Reason: Bad Request
HTTP response headers: HTTPHeaderDict({'Date': 'Mon, 30 Apr 2018 19:50:05 GMT', 'Content-Length': '139', 'Content-Type': 'application/json', 'Cache-Control': 'no-store'})
HTTP response body: {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"Upgrade request required","reason":"BadRequest","code":400}

send: 'GET /api/v1/namespaces/production/pods/secret-pod/exec?command=%5B%27cat+%2Fdata%2Fbusybox%2Fpassword%27%5D&stderr=True&stdin=False&stdout=True&tty=False HTTP/1.1\r\nHost: 192.168.42.218:8443\r\nAccept-Encoding: identity\r\nContent-Type: application/json\r\nauthorization: Bearer heoJMu0hqlrLWNJ2lV9MsaIWp1kPuKvwPhmhcmj9-Kg\r\nAccept: /\r\nUser-Agent: Swagger-Codegen/4.0.0/python\r\n\r\n'
reply: 'HTTP/1.1 400 Bad Request\r\n'
header: Cache-Control: no-store
header: Content-Type: application/json
header: Date: Mon, 30 Apr 2018 19:50:05 GMT
header: Content-Length: 139
2018-04-30 15:50:05,536 DEBUG https://192.168.42.218:8443 "GET /api/v1/namespaces/production/pods/secret-pod/exec?command=%5B%27cat+%2Fdata%2Fbusybox%2Fpassword%27%5D&stderr=True&stdin=False&stdout=True&tty=False HTTP/1.1" 400 139
Exception when calling CoreV1Api->get_namespaced_pod_exec: (400)
Reason: Bad Request
HTTP response headers: HTTPHeaderDict({'Date': 'Mon, 30 Apr 2018 19:50:05 GMT', 'Content-Length': '139', 'Content-Type': 'application/json', 'Cache-Control': 'no-store'})
HTTP response body: {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"Upgrade request required","reason":"BadRequest","code":400}

Upgrade request required when running exec command with python-kubernetes client #409

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