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lines changed Original file line number Diff line number Diff line change @@ -673,20 +673,22 @@ OutgoingMessage.prototype.setHeaders = function setHeaders(headers) {
673673 // We also cannot safely split by comma.
674674 // To avoid setHeader overwriting the previous value we push
675675 // set-cookie values in array and set them all at once.
676- const cookies = [ ] ;
676+ let cookies = null ;
677677
678678 for ( const { 0 : key , 1 : value } of headers ) {
679679 if ( key === 'set-cookie' ) {
680680 if ( ArrayIsArray ( value ) ) {
681+ cookies ??= [ ] ;
681682 cookies . push ( ...value ) ;
682683 } else {
684+ cookies ??= [ ] ;
683685 cookies . push ( value ) ;
684686 }
685687 continue ;
686688 }
687689 this . setHeader ( key , value ) ;
688690 }
689- if ( cookies . length ) {
691+ if ( cookies != null ) {
690692 this . setHeader ( 'set-cookie' , cookies ) ;
691693 }
692694
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