A co-browse service implements a resource acquisition process to enable proprietary resources to be accessed on a co-browse session. In some embodiments, co-browse JavaScript in a visitor browser converts some or all of the resource URLs of the DOM to point to the resource acquisition process so that the agent browser seeks to retrieve the URLs referenced resources from the resource acquisition process rather than from the website. The resource acquisition process, in turn, obtains the resources from the website or the visitor browser. Since the resource acquisition process is able to obtain the proprietary resources on behalf of the agent and provide the proprietary resources to the agent during the co-browse session, the agent is able to have a consistent view of the visitor's browser during the co-browse session.