Abstract: A system for fuzzing requests and responses using a proxy includes a client that may include a client application, a server that may include a server application, and a proxy coupled between the client and the server. The proxy communicates message traffic between the client and the server related to testing the client application or the server application. The proxy is adapted to store a template resulting from the message traffic into a data store to facilitate later fuzzing of requests or responses contained in the message traffic. A user interface for presenting events resulting from the fuzzing is also described.