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使用纯Java，我尝试发送Get请求并得到响应null。我的代码中是否有任何bug？

public static void  TradeExchange() throws IOException, InterruptedException {
        String urlString = "https://api.spimex.com/otc/lookup-tables/1";

        HttpClient httpClient = new HttpClient() {
                @Override
                public Optional<CookieHandler> cookieHandler() {
                        return Optional.empty();
                }

                @Override
                public Optional<Duration> connectTimeout() {
                        return Optional.empty();
                }

                @Override
                public Redirect followRedirects() {
                        return null;
                }

                @Override
                public Optional<ProxySelector> proxy() {
                        return Optional.empty();
                }

                @Override
                public SSLContext sslContext() {
                        return null;
                }

                @Override
                public SSLParameters sslParameters() {
                        return null;
                }

                @Override
                public Optional<Authenticator> authenticator() {
                        return Optional.empty();
                }

                @Override
                public Version version() {
                        return null;
                }

                @Override
                public Optional<Executor> executor() {
                        return Optional.empty();
                }

                @Override
                public <T> HttpResponse<T> send(HttpRequest httpRequest, HttpResponse.BodyHandler<T> bodyHandler) throws IOException, InterruptedException {
                        return null;
                }

                @Override
                public <T> CompletableFuture<HttpResponse<T>> sendAsync(HttpRequest httpRequest, HttpResponse.BodyHandler<T> bodyHandler) {
                        return null;
                }

                @Override
                public <T> CompletableFuture<HttpResponse<T>> sendAsync(HttpRequest httpRequest, HttpResponse.BodyHandler<T> bodyHandler, HttpResponse.PushPromiseHandler<T> pushPromiseHandler) {
                        return null;
                }
        };
        HttpRequest httpRequest = HttpRequest.newBuilder(URI.create(urlString))
                .GET()
                .build();
        try {
                HttpResponse<String> response = httpClient.send(httpRequest, HttpResponse.BodyHandlers.ofString());
                String body = response.body();
        } catch (IOException | InterruptedException e) {
                System.out.println(e.getMessage());
        }
}