title: Site-wide form with Symfony2?
body: <p>I have simple form at all site pages: username, password, [Sign In]</p>
  
  <p>I tried to make with with simple HTML, but I get</p>
  
  <pre><code>The CSRF token is invalid. Please try to resubmit the form
  </code></pre>
  
  <p>Idea to make form in each action seems bad. What is the good practice of doing site-wide forms?</p>