question: public String headerOut ( String name ) { ArrayList < String > keys = _headerKeysOut ; int headerSize = keys . size ( ) ; for ( int i = 0 ; i < headerSize ; i ++ ) { String oldKey = keys . get ( i ) ; if ( oldKey . equalsIgnoreCase ( name ) ) { return ( String ) _headerValuesOut . get ( i ) ; } } if ( name . equalsIgnoreCase ( "content-length" ) ) { return _contentLengthOut >= 0 ? String . valueOf ( _contentLengthOut ) : null ; } if ( name . equalsIgnoreCase ( "content-type" ) ) { return _contentTypeOut ; } return null ; }
target:  Returns the value of an already set output header.