쿠폰 번호 다운로드 API 수정

- MediaType openxmlformats 으로 수정

src/main/kotlin/kr/co/vividnext/sodalive/can/coupon/CanCouponController.kt

@@ -3,6 +3,7 @@ package kr.co.vividnext.sodalive.can.coupon
 import kr.co.vividnext.sodalive.common.ApiResponse
 import kr.co.vividnext.sodalive.common.SodaException
 import kr.co.vividnext.sodalive.member.Member
+import org.springframework.core.io.InputStreamResource
 import org.springframework.data.domain.Pageable
 import org.springframework.http.HttpHeaders
 import org.springframework.http.MediaType
@@ -15,6 +16,8 @@ import org.springframework.web.bind.annotation.RequestBody
 import org.springframework.web.bind.annotation.RequestMapping
 import org.springframework.web.bind.annotation.RequestParam
 import org.springframework.web.bind.annotation.RestController
+import java.net.URLEncoder
+import java.nio.charset.StandardCharsets
 
 @RestController
 @RequestMapping("/can/coupon")
@@ -68,10 +71,22 @@ class CanCouponController(private val service: CanCouponService) {
         if (member == null) throw SodaException("로그인 정보를 확인해주세요.")
 
         val fileName = "쿠폰번호리스트.xlsx"
+        val encodedFileName = URLEncoder.encode(
+            fileName,
+            StandardCharsets.UTF_8.toString()
+        ).replace("+", "%20")
+        val contentDisposition = "attachment; filename*=UTF-8''$encodedFileName"
+        val headers = HttpHeaders().apply {
+            add(HttpHeaders.CONTENT_DISPOSITION, contentDisposition)
+        }
+
         val response = service.downloadCouponNumberList(couponId)
         ResponseEntity.ok()
-            .header(HttpHeaders.CONTENT_DISPOSITION, "attatchment;filename=$fileName")
-            .contentType(MediaType.parseMediaType("application/vnd.ms-excel"))
-            .body(response)
+            .headers(headers)
+            .contentType(
+                MediaType
+                    .parseMediaType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
+            )
+            .body(InputStreamResource(response))
     }
 }