how to add json file as requestbody in retrofit code example

Example 1: how to read a json resposnse from a link in python

import urllib, json

url = "put url here"
response = urllib.request.urlopen(url)
data = json.loads(response.read())
print (data)

Example 2: How to send JSON Web Token (JWT Token) as header with Postman and golang

func CreateTokenEndpoint(w http.ResponseWriter, req *http.Request) {
    var user User
    _ = json.NewDecoder(req.Body).Decode(&user)
    token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
        "username": user.Username,
    })
    tokenString, error := token.SignedString([]byte("secret"))
    if error != nil {
        fmt.Println(error)
    }
    json.NewEncoder(w).Encode(JwtToken{Token: tokenString})
}