Oracle HTTP If-None-Match返回ETag +最后修改

Question

我当前正在请求oracle网站从我的应用程序下载java，我检查是否使用If-None-Match标记发送本地文件的ETag更新了本地文件。服务器以以下格式向我返回了ETag：“ acd45017cd055c797a331b2f0652d293：1539062148.210488”，它是etag：最后修改的。

在这种情况下，服务器应该返回304，但始终返回200，因为我的本地ETag“ acd45017cd055c797a331b2f0652d293”与服务器ETag“ acd45017cd055c797a331b2f0652d293：1539062148.210488”不匹配

protected HttpURLConnection makeConnection(URL url) throws IOException {
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();

    connection.setUseCaches(false);
    connection.setDefaultUseCaches(false);
    if (!shouldIgnoreLocal() && getTarget().isFile())
        connection.setRequestProperty("If-None-Match", getDigest(getTarget(), "MD5", 32));
    connection.setRequestProperty("Cookie", "oraclelicense=accept-securebackup-cookie");
    connection.setRequestProperty("Cache-Control", "no-store,max-age=0,no-cache");
    connection.setRequestProperty("Expires", "0");
    connection.setRequestProperty("Pragma", "no-cache");
    connection.setConnectTimeout(5000);
    connection.setReadTimeout(30000);
    int status = connection.getResponseCode();
    while (status != HttpURLConnection.HTTP_OK && (status == HttpURLConnection.HTTP_MOVED_TEMP || status == HttpURLConnection.HTTP_MOVED_PERM || status == HttpURLConnection.HTTP_SEE_OTHER)) {
        String newUrl = connection.getHeaderField("Location");
        connection = makeConnection(new URL(newUrl));
        status = connection.getResponseCode();
    }

    System.out.println(connection.getHeaderField("Last-Modified"));
    System.out.println(connection.getHeaderField("If-None-Match"));
    System.out.println(connection.getHeaderField("ETag"));
    System.out.println(connection.getResponseCode());
    System.out.println(connection.getHeaderField("Last-Modified"));
    System.out.println(connection.getHeaderField("If-None-Match"));
    System.out.println(connection.getHeaderField("ETag"));
    System.out.println(connection.getResponseCode());
    return connection;
}