void addHandler(Handler handler) {
        collection.addHandler(handler)
    }

    /**
     * Blocks on SSL handshake for 60 seconds.
     */
    void expectSslHandshakeBlocking() {
        sslPreHandler {
            Thread.sleep(TimeUnit.SECONDS.toMillis(60))
        }
    }

    static class HttpExpectOne extends ExpectOne {
        final Action action
        final Collection<String> methods