title: Server returned HTTP response code: 500 for URL
body: <pre><code>java.io.IOException: Server returned HTTP response code: 500 for URL: http://ww
  .huadt.com.cn/zh-cn/i/l/@357671030745308@V500@0000@AUTOLOW@1@11d590f7$GPRMC,065
  48.000,A,3959.8587,N,11617.2447,E,0.00,55.32,210311,,,A*56@@
          at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown S
  urce)
          at hdt.SendCmdToP.Sendplatform(SendCmdToP.java:67)
          at hdt.SendCmdToP.process(SendCmdToP.java:198)
          at hdt.SendCmdToP.run(SendCmdToP.java:131)
  java.lang.NullPointerException
          at hdt.SendCmdToP.Sendplatform(SendCmdToP.java:91)
          at hdt.SendCmdToP.process(SendCmdToP.java:198)
          at hdt.SendCmdToP.run(SendCmdToP.java:131)
  </code></pre>
  
  <p>Appeared pointer, and 500 wrong with the closure of the abnormal, a firewall relationship? If not is it code problems? Please help everybody see how to solve the problem. 
  thanks。</p>