Error [ERR_HTTP_HEADERS_SENT] (1) 썸네일형 리스트형 노드 회원가입, if else문 중복 값 전송에러. Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client 노드에서 if else문을 작성했는데 이런 에러 메세지가 떴다. Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client at new NodeError (node:internal/errors:372:5) at ServerResponse.setHeader (node:_http_outgoing:576:11) at ServerResponse.header (C:\Users\SJ\Desktop\elice\study\back\node_modules\express\lib\res.. 이전 1 다음
