Systems, methods, and non-transitory computer-readable storage media for serving content stored in an online synchronized content management system from a sandbox domain via a temporary address. The online synchronized content management system may receive a first request from a user to access a content item stored in the system. The first request may be received at a first domain via a first address that is directed to the first domain. The system may generate a second address that is directed to a second domain such as a sandbox domain. Then, the second address can be associated with the content item for direct access. When the system receives, at the second domain via the second address, a second request to access the content item, the content item can be served from the second domain. After the system receives the second request, it can generate and issue a session identifier for the second address to verify any subsequent requests to access the content item via the second address.