Techniques to provide persistent uniform resource locators (URLs) for client applications acting as web services are described herein. In one or more implementations, the techniques utilize standard protocols and libraries (e.g., standard HTTP) without relying upon custom/propriety plug-ins. An intermediary server functions as a tunnel service is configured to provide functionality for handling communications between endpoints on behalf of client applications. Additionally, the tunnel service provides a mechanism to generate and assign persistent URLs (or comparable addresses) to client applications. Entities seeking to interact with the client applications use corresponding URLs to direct requests via the tunnel service and down to the appropriate client application. Local storage associated with the client application is employed to store the credentials, such that the URL persists across multiple sessions and the same URL is generated repeatedly by the tunnel service each time corresponding and valid credentials are supplied by a client.