code: public MergeRequest getMergeRequest(Object projectIdOrPath, Integer mergeRequestIid) throws GitLabApiException {
          Response response = get(Response.Status.OK, null, "projects", getProjectIdOrPath(projectIdOrPath), "merge_requests", mergeRequestIid);
          return (response.readEntity(MergeRequest.class));
      }
docs: Get information about a single merge request.
  
  <p>NOTE: GitLab API V4 uses IID (internal ID), V3 uses ID to identify the merge request.</p>
  
  <pre><code>GitLab Endpoint: GET /projects/:id/merge_requests/:merge_request_id</code></pre>
  
  @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
  @param mergeRequestIid the internal ID of the merge request
  @return the specified MergeRequest instance
  @throws GitLabApiException if any exception occurs