12.2.3.2. 发出请求

curl -X POST \
    -d "client_id=starting-client" \
    -d "client_secret=the client secret" \
    --data-urlencode "grant_type=urn:ietf:params:oauth:grant-type:token-exchange" \
    -d "subject_token=...." \
    --data-urlencode "requested_token_type=urn:ietf:params:oauth:token-type:access_token" \
    -d "requested_issuer=google" \
    http://localhost:8080/realms/myrealm/protocol/openid-connect/token

{
   "access_token" : "....",
   "expires_in" : 3600
   "account-link-url" : "https://...."
}

{
   "error" : "....",
   "error_description" : "..."
   "account-link-url" : "https://...."
}