question: returns an immutable case-insensitive set of header names . concode_field_sep List<String> namesAndValues concode_elem_sep String[] namesAndValues concode_field_sep Builder add concode_elem_sep Builder add concode_elem_sep Builder addLenient concode_elem_sep Builder addLenient concode_elem_sep Builder set concode_elem_sep List<String> values concode_elem_sep void checkNameAndValue concode_elem_sep Builder newBuilder concode_elem_sep Builder removeAll concode_elem_sep int size concode_elem_sep Headers build concode_elem_sep String get concode_elem_sep String get concode_elem_sep String get concode_elem_sep Headers of concode_elem_sep Headers of concode_elem_sep String name concode_elem_sep Map<String,List<String>> toMultimap concode_elem_sep Date getDate concode_elem_sep String toString concode_elem_sep String value
target: Set < String > function ( ) { TreeSet < String > loc0 = new TreeSet < > ( String . CASE_INSENSITIVE_ORDER ) ; for ( int loc1 = 0 , loc2 = loc2 ( ) ; loc1 < loc2 ; loc1 ++ ) { loc0 . add ( name ( loc1 ) ) ; } return Collections . unmodifiableSet ( loc0 ) ; }