title: gitlab intellij plugin received HTTP code 400
body: <p>I use GitLab Projects Plugin in IntelliJ idea to connect to my repository.
  when I want to commit my changes I receive </p>
  
  <pre><code>fatal: unable to access 'https://server:port/usr/project.git/': Received HTTP code 400 from proxy after CONNECT 
  </code></pre>
  
  <p>how can I handle this error. thank you</p>