public static Context testContext() {
        return new Context(Runnable::run, null);
    }
Override this to implement custom access logging.

@param startTime execution start
@param renderStartTime start of output rendering
@param response the response which the log entry regards
@param httpRequest the incoming HTTP request
@param rendererWiring the stream the rendered response is written to, used for
                      fetching length of rendered response
container-core/src/main/java/com/yahoo/container/jdisc/ThreadedHttpRequestHandler.java