Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client

[mina-dong]

관련이슈: #50

Received data: First Medicine: 에이서 Second Medicine: 카토라 D:\4th\oss\GSS_Project\oss-project\node_modules\mysql\lib\protocol\Parser.js:437 throw err; // Rethrow non-MySQL errors ^

Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client at new NodeError (node:internal/errors:399:5) at ServerResponse.setHeader (node:_http_outgoing:645:11) at ServerResponse.header (D:\4th\oss\GSS_Project\oss-project\node_modules\express\lib\response.js:795:10) at ServerResponse.send (D:\4th\oss\GSS_Project\oss-project\node_modules\express\lib\response.js:175:12) at ServerResponse.json (D:\4th\oss\GSS_Project\oss-project\node_modules\express\lib\response.js:279:15) at Query. (D:\4th\oss\GSS_Project\oss-project\src\server\server.js:49:13) at Query. (D:\4th\oss\GSS_Project\oss-project\node_modules\mysql\lib\Connection.js:526:10) at Query._callback (D:\4th\oss\GSS_Project\oss-project\node_modules\mysql\lib\Connection.js:488:16) at Sequence.end (D:\4th\oss\GSS_Project\oss-project\node_modules\mysql\lib\protocol\sequences\Sequence.js:83:24)
at Query._handleFinalResultPacket (D:\4th\oss\GSS_Project\oss-project\node_modules\mysql\lib\protocol\sequences\Query.js:149:8) { code: 'ERR_HTTP_HEADERS_SENT' }

[mina-dong]

두 번으로 다르게 응답을 받아서 생긴 오류 같아요 . res.send() 부분 수정하고 해당 이슈 처리했습니다.