This document describes systems, devices, and methods for testing the integration of a content provider's origin infrastructure with a content delivery network (CDN). In embodiments, the teachings hereof enable a content provider's developer to rapidly and flexibly create test environments that send test traffic through the same CDN hardware and software that handle (or at least have the ability to handle) production traffic, but in isolation from that production traffic and from each other. Furthermore, in embodiments, the teachings hereof enable the content provider to specify an arbitrary test origin behind its corporate firewall with which the CDN should communicate.