title: Failed to connect to SonarQube server
body: <p>When i am trying to connect to Sonarqube server from sonarlint test connection gui, it throws an exception:</p>
  
  <pre><code>Fail to request https://sonarqube.mycompany.com/api/system/status
  java.lang.IllegalStateException: Fail to request https://sonarqube.mycompany.com/api/system/status  at org.sonarqube.ws.client.HttpConnector.doCall(HttpConnector.java:212)
      at org.sonarqube.ws.client.HttpConnector.get(HttpConnector.java:154)
      at org.sonarqube.ws.client.HttpConnector.call(HttpConnector.java:143)
      at org.sonarsource.sonarlint.core.container.connected.SonarLintWsClient.rawGet(SonarLintWsClient.java:99)
      at org.sonarsource.sonarlint.core.container.connected.validate.ServerVersionAndStatusChecker.fetchServerInfos(ServerVersionAndStatusChecker.java:96)
      at org.sonarsource.sonarlint.core.container.connected.validate.ServerVersionAndStatusChecker.checkVersionAndStatus(ServerVersionAndStatusChecker.java:60)
      at org.sonarsource.sonarlint.core.container.connected.validate.ServerVersionAndStatusChecker.checkVersionAndStatus(ServerVersionAndStatusChecker.java:50)
      at org.sonarsource.sonarlint.core.WsHelperImpl.validateConnection(WsHelperImpl.java:48)
      at org.sonarsource.sonarlint.core.WsHelperImpl.validateConnection(WsHelperImpl.java:43)
      at org.sonarlint.eclipse.core.internal.server.Server.testConnection(Server.java:225)
      at org.sonarlint.eclipse.ui.internal.server.wizard.ServerConnectionTestJob.run(ServerConnectionTestJob.java:44)
      at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:122)
  Caused by: java.io.IOException: Unexpected response code for CONNECT: 404
      at com.squareup.okhttp.internal.io.RealConnection.createTunnel(RealConnection.java:300)
  </code></pre>