Wrapper around http.ResponseWriter to capture egress traffic Inspired from Negroni : https://github.com/codegangsta/negroni/blob/master/response_writer.go SmartProxy is a companion for Web API developers by mocking, filtering, replaying, "diff'ing" HTTP req/responses It may also help Web API hosting via diff'ing between API versions and taking actions when errors. - maintains an history of request - allows to inspect them - allows to modify them : YOU take action Adaptation of http/httputil/NewSingleHostReverseProxy with no URL rewrite, ie, the proxy route/pattern is not prefixed to incoming requests URLs Viewer to inspect traffic