title: Is subdomain part of a https url secure?
body: <p>If we have something like this url:</p>
  
  <pre><code>https://www.example.com/Some/Page/index.html?id=15
  </code></pre>
  
  <p>I know that <code>example.com</code> will be sent as plain text, but <code>/Some/Page/index.html?id=15</code> is sending securely.</p>
  
  <p>Now, my question is, if we have something like this:</p>
  
  <pre><code>https://somesubdomain.example.com/Some/Page/index.html?id=15
  </code></pre>
  
  <p>May attackers know that I'm visiting <code>somesubdomain.example.com</code>? or they just can know I'm visiting <code>example.com</code>?</p>
  
  <p>In other words, is subdomain part of url sending securely?</p>