public boolean isMultiValued(final String name) {
    List<String> values = headers.get(name);
    return values != null && values.size() > 1;
  }
Returns true if named value is multivalued.

@param name name of header
@return true if named value is multivalued, false if single value or null
crawler-commons/src/main/java/achecrawler/crawler/crawlercommons/util/Headers.java