解决sun.net.www.protocol.http.HttpURLConnection cannot be cast to javax.net.ssl.HttpsURLConnection

sun.net.www.protocol.http.HttpURLConnection cannot be cast to javax.net.ssl.HttpsURLConnection

解决方法：

报错的写法：URL realUrl = new URL(url);

不报错写法:URL realUrl= new URL(null, url, new sun.net.www.protocol.https.Handler());

HttpsURLConnection conn = (HttpsURLConnection) realUrl.openConnection();

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