首先，命令末尾有一个多余的“”。
试试这个
curl -v -H "Accept: application/json" -H "Content-type: application/json" -X POST -d ' {"user":{"first_name":"firstname","last_name":"lastname","email":"email@email.com","password":"app123","password_/confirm/iation":"app123"}}' http://localhost:3000/api/1/users
