title: Why git clone git:// is not working
body: <pre><code>// This works
  git clone https://github.com/foreverjs/forever.git
  
  // This one also works
  git clone git@github.com:foreverjs/forever.git
  
  // This one didn't work
  git clone git://github.com/foreverjs/forever.git
  </code></pre>
  
  <p>The error message for the third one is:</p>
  
  <pre><code>Cloning into 'forever'...
  Permission denied (publickey).
  fatal: Could not read from remote repository.
  
  Please make sure you have the correct access rights
  and the repository exists.
  </code></pre>
  
  <p>As far as I know, git clone over SSH or HTTPS is more restricted than <code>git://</code> protocol. I'm really confused why I got the this error message since <code>git://</code> protocol doesn't even require for authentication.</p>
  
  <p>Is github only allowed git clone over SSH or HTTPS now or I missed something here?</p>