How to authenticate and get the token using postman? i always get "invalid token in the "authentication" post as per documentation

[DCIM_Support]

i do the following with postman: 

POST https://myserver/api/v8.1/authentication 

Headers: "Accept" "application/json"

                 "Content-Type" "application/json" 

Then in postman i set  "No Auth"  because otherwise user and password are  not sent  as body of the post as per documentation

Body of the request  is the  user and password  the same way they are sent in the  restapi documentation with "try it" 

I always  get    "invalid token" in the reply but as per  the documentation this is the method to be used  the first time to obtain the token.  

Postman is also creating the curl code corresponding to the call : 

curl -X POST \
https://10.206.203.2/api/v8.1/authentication \
-H 'Accept: application/json' \
-H 'Content-Type: application/json' \
-H 'Postman-Token: b427d487-89c5-4c5e-a3cc-d940b603a8a8' \
-H 'cache-control: no-cache' \
-d '{"password": "xxxx","username": "xxxx"}'

What am i doing wrong?   

Is there any  ready example in python to obtain the   authentication token  and in general  to perform some requests? 

Thanks a lot fo rthe kind reply

(CID:152076809)

[DCIM_Support]

Hello , i  solved the problem    about authentication in postman. 

But it would be nice to  collect some  restapi usage examples   in java/python..... 

(CID:152076864)

[DCIM_Support]

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