无法从android发出https请求错误-连接已被对等方关闭

我正在尝试从android向api端点“”发送https请求。然而，不管我尝试了什么选择，我都会得到“与同龄人近距离的连接”，来自邮递员和浏览器的请求都可以正常工作

String webUrl = EndPointMethods.BASE_URL  + EndPointMethods.CATEGORIES;
                URL url = new URL(webUrl);
                HttpsURLConnection urlConnection = (HttpsURLConnection)url.openConnection();
                try {
                    urlConnection.setSSLSocketFactory(new SSLSocketFactoryExtended());
                } catch (NoSuchAlgorithmException e) {  e.printStackTrace();  }
                catch (KeyManagementException e) { e.printStackTrace();}

                urlConnection.setRequestMethod("GET");
                BufferedReader in = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
                String inputLine;
                StringBuffer response = new StringBuffer();

                while ((inputLine = in.readLine()) != null) {
                    response.append(inputLine);
                }
                in.close();

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在进行Https调用之前调用此方法解决了问题，但是我仍然不了解实际问题是什么，以及此方法如何解决问题，有人可以向我解释此函数在解决当前问题方面实现了什么功能吗

private void trustEveryone(Context appContext) {

        try{

            ProviderInstaller.installIfNeeded(appContext);

            HttpsURLConnection.setDefaultHostnameVerifier(new HostnameVerifier(){

                public boolean verify(String hostname, SSLSession session) {
                    return true;
                }});

            SSLContext context = SSLContext.getInstance("TLS");

            context.init(null, new X509TrustManager[]{new X509TrustManager(){

                public void checkClientTrusted(X509Certificate[] chain, String authType) {}
                public void checkServerTrusted(X509Certificate[] chain, String authType) {}
                public X509Certificate[] getAcceptedIssuers() {
                    return new X509Certificate[0];
                }}}, new SecureRandom());

            HttpsURLConnection.setDefaultSSLSocketFactory(
                    context.getSocketFactory());

        } catch (
            NoSuchAlgorithmException |  GooglePlayServicesNotAvailableException | KeyManagementException |  GooglePlayServicesRepairableException e) {
            e.printStackTrace();
        }

    }

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谢谢使用后，我相信主机名中的下划线就是问题所在。看看哪一个确认了您在JDK方面的工作，并可以解释为什么其他工具没有受到影响。

谢谢Toby，我现在有了更好的理解