希望这能帮上忙。

public HttpClient getBasicAuthDefaultHttpClient() {
    CredentialsProvider provider = new BasicCredentialsProvider();
    UsernamePasswordCredentials creds = new UsernamePasswordCredentials(user, 
    password);
    provider.setCredentials(AuthScope.ANY, creds);

    //Fix to avoid HTTP 504 ERROR (GATEWAY TIME OUT ERROR)
    RequestConfig.Builder requestBuilder = RequestConfig.custom();
    requestBuilder.setConnectTimeout(30 * 1000);
    requestBuilder.setConnectionRequestTimeout(30 * 1000);

    HttpClientBuilder builder = HttpClientBuilder.create();
    builder.setDefaultRequestConfig(requestBuilder.build());
    builder.setDefaultCredentialsProvider(provider).build();

    return builder.build();
}