title: Is there any way to know current url is in a specific blueprint in flask?
body: <p>in my flask app I can use a blueprint to register lots of routes..</p>
  
  <pre><code>@myblueprint.route('/first')
  @myblueprint.route('/two')
  @myblueprint.route('/three')
  </code></pre>
  
  <p>my problem is that I need to know current url in in a specific blueprint.so I can give it a <code>class='active'</code> css effect in jinja template?
  So is there any way I can do using flask 0.10.0?</p>