static class ServiceUnavailableAction extends ActionSupport {
        ServiceUnavailableAction(String displayName) {
            super(displayName)
        }

        @Override
        void handle(HttpServletRequest request, HttpServletResponse response) {
            response.sendError(503, "service unavailable")
        }
    }

    class SendFileAction extends ActionSupport {
        private final String path

        destFile.bytes == content
        writer.writeCount == 1
    }

    def "sends X-Gradle-Version and Content-Type headers on GET"() {
        server.expect("/cache/${key.hashCode}", ["GET"], new HttpServer.ActionSupport("get has appropriate headers") {
            void handle(HttpServletRequest request, HttpServletResponse response) {
                request.getHeader("X-Gradle-Version") == "3.0"

        def pluginMarker = module(pluginId, pluginId + PLUGIN_MARKER_SUFFIX, pluginVersion)
        server.expect(pluginMarker.pomPath, ["GET"], new HttpServer.ActionSupport("plugin marker pom") {
            void handle(HttpServletRequest request, HttpServletResponse response) {
                ConfigureUtil.configure(markerQueryConfigurer, response)
            }
        })
    }