gateway-service-auth/src/main/java/org/apache/knox/gateway/service/auth/AbstractAuthResource.java [98:118]:
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  private List<String> getGroupStrings(Collection<String> groupNames) {
    if (groupNames.isEmpty()) {
      return Collections.emptyList();
    }
    List<String> groupStrings = new ArrayList<>();
    StringBuilder sb = new StringBuilder();
    for (String groupName : groupNames) {
      if (sb.length() + groupName.length() > MAX_HEADER_LENGTH) {
        groupStrings.add(sb.toString());
        sb = new StringBuilder();
      }
      if (sb.length() > 0) {
        sb.append(',');
      }
      sb.append(groupName);
    }
    if (sb.length() > 0) {
      groupStrings.add(sb.toString());
    }
    return groupStrings;
  }
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gateway-spi/src/main/java/org/apache/knox/gateway/dispatch/ConfigurableDispatch.java [216:236]:
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  private List<String> getGroupStrings(final Collection<String> groupNames) {
    if (groupNames.isEmpty()) {
      return Collections.emptyList();
    }
    List<String> groupStrings = new ArrayList<>();
    StringBuilder sb = new StringBuilder();
    for (String groupName : groupNames) {
      if (sb.length() + groupName.length() > MAX_HEADER_LENGTH) {
        groupStrings.add(sb.toString());
        sb = new StringBuilder();
      }
      if (sb.length() > 0) {
        sb.append(',');
      }
      sb.append(groupName);
    }
    if (sb.length() > 0) {
      groupStrings.add(sb.toString());
    }
    return groupStrings;
  }
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