container/src/main/java/com/streamsets/datacollector/cli/sch/SchAdmin.java
private static String normalizeDpmBaseURL(String url) {
    if (url.endsWith("/")) {
      url = url.substring(0, url.length() - 1);
    }

    return url;
  }
private static String normalizeDpmBaseURL(String url) {
    if (url.endsWith("/")) {
      url = url.substring(0, url.length() - 1);
    }

    return url;
  }
Normalize Control Hub URL - primarily drop training slash.