title: WordPress Permalink structure mysite.com/blog/%postname%/%post_id%/
body: <p>On my site Im using: mysite.com/blog/%postname%/%post_id%/ as Permalink structure.</p>
  
  <p>So I have 1 post at: mysite.com/blog/my-first-post/1234/</p>
  
  <p>But this same post is also possible to visit at: (without postID)
  mysite.com/blog/my-first-post/</p>
  
  <p>Will that cause double contents issue? Why or how is it possible to visit this same post with 2 different URLS? I don't understand why WordPress do this. Im using WordPress 3.6.1</p>