title: gitlab & jenkins, "no client-builder found that supports server" error
body: <p>I have created and set a Gitlab tokne, and try to set <code>Gitlab host URL</code>:
  like this: </p>
  
  <p><code>https://gitlab.com/api/v4/users/1*****3</code></p>
  
  <p><code>1*****3</code> is my gitlab ID. I test the <code>api</code> on browser is work, get a <code>json</code> document.</p>
  
  <p>ref: <a href="https://stackoverflow.com/questions/51382771/what-does-gitlab-host-url-means-in-configuring-gitlab-in-jenkins">What does Gitlab Host URL means in configuring gitlab in jenkins?</a></p>
  
  <p>But when I chick <code>test connection</code>, is show the error message, like this:</p>
  
  <p><code>java.util.NoSuchElementException: no client-builder found that supports server at https://gitlab.com/api/v4/users/1*****3
      at com.dabsquared.gitlabjenkins.gitlab.api.impl.AutodetectingGitLabClient.autodetectOrDie(AutodetectingGitLabClient.java:310)
      at com.dabsquared.gitlabjenkins.gitlab.api.impl.AutodetectingGitLabClient.delegate(AutodetectingGitLabClient.java:298)
      at com.dabsquared.gitlabjenkins.gitlab.api.impl.AutodetectingGitLabClient.access$200(AutodetectingGitLabClient.java:14)......</code></p>