Techniques for modifying requests or browser viewable documents (e.g., markup language documents) are described. By modifying requests or browser viewable documents, access to resources residing on remote servers through an intermediate server is facilitated. In one embodiment, Universal Resource Locators (URLs) associated with requests or markup language documents are modified. The techniques are suitable for both secure and unsecure requests. The techniques can also modify requests or browser viewable documents at the intermediate server, a client device, or both.