curl --location 'https://api.yonyouup.com/api/user/login_v2?from_account=undefined&to_account=undefined&app_key=undefined&token=undefined' \
--header 'Content-Type: application/json' \
--data '{
"user":{
"user_id":"leaf",
"password":""
}
}'{
"errcode": "string",
"errmsg": "string"
}