@Nullable
  public GitlabIssue fetchIssue(int projectId, int issueId) throws Exception {
    ensureProjectsDiscovered();
    final HttpGet request = new HttpGet(getRestApiUrl("projects", projectId, "issues", issueId));
    final ResponseHandler<GitlabIssue> handler = new GsonSingleObjectDeserializer<>(GSON, GitlabIssue.class, true);
    return getHttpClient().execute(request, handler);
  }
@Nullable
  public GitlabIssue fetchIssue(int projectId, int issueId)