title: pip install specific fork
body: <p>I'm trying to <code>pip install</code> a specific fork of a repo, which is located here: <a href="https://github.com/grutz/flask-session/tree/ed62129fa1d9af36e77e9ce1de571d2c873a6c4e" rel="noreferrer">https://github.com/grutz/flask-session/tree/ed62129fa1d9af36e77e9ce1de571d2c873a6c4e</a></p>
  
  <p>Per <a href="https://stackoverflow.com/questions/20101834/pip-install-from-git-repo-branch">this SO question</a>, I've tried the following but no luck:</p>
  
  <pre><code># pip install &lt;link&gt;
  pip install https://github.com/grutz/flask-session/tree/ed62129fa1d9af36e77e9ce1de571d2c873a6c4e
  
  # pip install git+&lt;link&gt;
  pip install git+https://github.com/grutz/flask-session/tree/ed62129fa1d9af36e77e9ce1de571d2c873a6c4e
  
  # pip install git+https://github.com/user/repo@branch
  pip install git+https://github.com/grutz/flask-session@ed62129fa1d9af36e77e9ce1de571d2c873a6c4e
  
  # pip install git+https://github.com/user/repo.git@branch
  pip install git+https://github.com/grutz/flask-session.git@ed62129fa1d9af36e77e9ce1de571d2c873a6c4e
  </code></pre>
  
  <p>What am I doing wrong here? I can post my stack trace but I figured I'm missing something simple here and that would just add clutter.</p>