apache httpclient 4.5 兼容 http https

 String responseContent = "";
 try {
     SSLContextBuilder contextBuilder = new SSLContextBuilder();
     contextBuilder.loadTrustMaterial(null, new TrustSelfSignedStrategy());
     SSLConnectionSocketFactory sslConnectionSocketFactory = new SSLConnectionSocketFactory(contextBuilder.build());
     CloseableHttpClient httpclient = HttpClients.custom().setSSLSocketFactory(sslConnectionSocketFactory).build();
     HttpGet httpGet = new HttpGet(requestUrl);
     CloseableHttpResponse response = httpclient.execute(httpGet);
     try {
         HttpEntity entity = response.getEntity();
         if (null != entity) {
             responseContent = EntityUtils.toString(entity, ContentType.getOrDefault(entity).getCharset());
             EntityUtils.consume(entity);
         }
     } finally {
         response.close();
     }
 } catch (KeyStoreException e) {
     e.printStackTrace();
 } catch (NoSuchAlgorithmException e) {
     e.printStackTrace();
 } catch (KeyManagementException e) {
     e.printStackTrace();
 }
 return responseContent;