code: protected Response post(Response.Status expectedStatus, StreamingOutput stream, String mediaType, Object... pathArgs) throws GitLabApiException {
          try {
              return validate(getApiClient().post(stream, mediaType, pathArgs), expectedStatus);
          } catch (Exception e) {
              throw handle(e);
          }
      }
docs: Perform an HTTP POST call with the specified payload object and path objects, returning
  a ClientResponse instance with the data returned from the endpoint.
  
  @param expectedStatus the HTTP status that should be returned from the server
  @param stream the StreamingOutput that will be used for the POST data
  @param mediaType the content-type for the streamed data
  @param pathArgs variable list of arguments used to build the URI
  @return a ClientResponse instance with the data returned from the endpoint
  @throws GitLabApiException if any exception occurs during execution