title: How to post data to https website on GAE(Java)
body: <p>On Google App Engine,I am using JAVA.
  I have some question about my project.</p>
  
  <p>I want to get some data from a website which needs to login</p>
  
  <p>Usually, I will use HttpURLConnection below to accomplish this job</p>
  
  <p>The question is, the website is not "http://..." but "https://.."
  above code does not work.</p>
  
  <p>how can I login to the website using java on GAE?</p>