diff --git a/src/main/java/com/kamco/cd/kamcoback/common/download/RangeDownloadResponder.java b/src/main/java/com/kamco/cd/kamcoback/common/download/RangeDownloadResponder.java
index a5a6cb5a..01cd0d24 100644
--- a/src/main/java/com/kamco/cd/kamcoback/common/download/RangeDownloadResponder.java
+++ b/src/main/java/com/kamco/cd/kamcoback/common/download/RangeDownloadResponder.java
@@ -5,7 +5,6 @@ import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.List;
-import java.util.Map;
 import org.springframework.core.io.FileSystemResource;
 import org.springframework.core.io.Resource;
 import org.springframework.core.io.support.ResourceRegion;
@@ -15,43 +14,11 @@ import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Component;
 
-/**
- * Range(이어받기) 지원 파일 다운로드 응답 생성기.
- *
- * <p>- Range 헤더 없으면 200 + Resource - Range 헤더 있으면 206 + ResourceRegion - 잘못된 Range면 416 +
- * Content-Range: bytes
- *
- * <p>주의: - 다중 Range는 첫 번째 Range만 처리(안정성 목적). - 파일이 이미 생성되어 있는 대용량(zip 등) 다운로드에 적합.
- */
 @Component
 public class RangeDownloadResponder {
 
-  /** 기본(zip) 다운로드 응답 생성. */
   public ResponseEntity<?> buildZipResponse(
       Path filePath, String downloadFileName, HttpServletRequest request) throws IOException {
-    return buildResponse(
-        filePath, downloadFileName, MediaType.APPLICATION_OCTET_STREAM, request, Map.of());
-  }
-
-  /** 추가 헤더가 필요한 경우(예: X-Accel-Buffering) 사용. */
-  public ResponseEntity<?> buildZipResponse(
-      Path filePath,
-      String downloadFileName,
-      HttpServletRequest request,
-      Map<String, String> extraHeaders)
-      throws IOException {
-    return buildResponse(
-        filePath, downloadFileName, MediaType.APPLICATION_OCTET_STREAM, request, extraHeaders);
-  }
-
-  /** 콘텐츠 타입까지 지정하고 싶을 때 사용. */
-  public ResponseEntity<?> buildResponse(
-      Path filePath,
-      String downloadFileName,
-      MediaType contentType,
-      HttpServletRequest request,
-      Map<String, String> extraHeaders)
-      throws IOException {
 
     if (!Files.isRegularFile(filePath)) {
       return ResponseEntity.notFound().build();
@@ -60,73 +27,53 @@ public class RangeDownloadResponder {
     long totalSize = Files.size(filePath);
     Resource resource = new FileSystemResource(filePath);
 
-    // 공통 헤더(200/206 공통)
     String disposition = "attachment; filename=\"" + downloadFileName + "\"";
     String rangeHeader = request.getHeader(HttpHeaders.RANGE);
 
-    if (rangeHeader == null || rangeHeader.isBlank()) {
-      // 200 OK (전체 다운로드)
-      ResponseEntity.BodyBuilder ok =
-          ResponseEntity.ok()
-              .contentType(contentType)
-              .header(HttpHeaders.CONTENT_DISPOSITION, disposition)
-              .header(HttpHeaders.ACCEPT_RANGES, "bytes")
-              .contentLength(totalSize);
+    // 🔥 공통 헤더 (여기 고정)
+    ResponseEntity.BodyBuilder base =
+        ResponseEntity.ok()
+            .contentType(MediaType.APPLICATION_OCTET_STREAM)
+            .header(HttpHeaders.CONTENT_DISPOSITION, disposition)
+            .header(HttpHeaders.ACCEPT_RANGES, "bytes")
+            .header("X-Accel-Buffering", "no");
 
-      applyExtraHeaders(ok, extraHeaders);
-      return ok.body(resource);
+    if (rangeHeader == null || rangeHeader.isBlank()) {
+      return base.contentLength(totalSize).body(resource);
     }
 
-    // Range 파싱
     List<HttpRange> ranges;
     try {
       ranges = HttpRange.parseRanges(rangeHeader);
     } catch (IllegalArgumentException ex) {
-      // 416 Range Not Satisfiable
-      ResponseEntity.BodyBuilder badRange =
-          ResponseEntity.status(416).header(HttpHeaders.CONTENT_RANGE, "bytes */" + totalSize);
-      applyExtraHeaders(badRange, extraHeaders);
-      return badRange.build();
+      return ResponseEntity.status(416)
+          .header(HttpHeaders.CONTENT_RANGE, "bytes */" + totalSize)
+          .header("X-Accel-Buffering", "no")
+          .build();
     }
 
-    // 실무에선 단일 Range만 처리하는 게 안전합니다.
     HttpRange range = ranges.get(0);
 
     long start = range.getRangeStart(totalSize);
     long end = range.getRangeEnd(totalSize);
 
     if (start >= totalSize) {
-      ResponseEntity.BodyBuilder badRange =
-          ResponseEntity.status(416).header(HttpHeaders.CONTENT_RANGE, "bytes */" + totalSize);
-      applyExtraHeaders(badRange, extraHeaders);
-      return badRange.build();
+      return ResponseEntity.status(416)
+          .header(HttpHeaders.CONTENT_RANGE, "bytes */" + totalSize)
+          .header("X-Accel-Buffering", "no")
+          .build();
     }
 
     long regionLength = end - start + 1;
     ResourceRegion region = new ResourceRegion(resource, start, regionLength);
 
-    // 206 Partial Content
-    ResponseEntity.BodyBuilder partial =
-        ResponseEntity.status(206)
-            .contentType(contentType)
-            .header(HttpHeaders.CONTENT_DISPOSITION, disposition)
-            .header(HttpHeaders.ACCEPT_RANGES, "bytes")
-            .header(HttpHeaders.CONTENT_RANGE, "bytes " + start + "-" + end + "/" + totalSize)
-            .contentLength(regionLength);
-
-    applyExtraHeaders(partial, extraHeaders);
-    return partial.body(region);
-  }
-
-  private void applyExtraHeaders(
-      ResponseEntity.HeadersBuilder<?> builder, Map<String, String> extraHeaders) {
-    if (extraHeaders == null || extraHeaders.isEmpty()) return;
-
-    extraHeaders.forEach(
-        (k, v) -> {
-          if (k != null && !k.isBlank() && v != null) {
-            builder.header(k, v);
-          }
-        });
+    return ResponseEntity.status(206)
+        .contentType(MediaType.APPLICATION_OCTET_STREAM)
+        .header(HttpHeaders.CONTENT_DISPOSITION, disposition)
+        .header(HttpHeaders.ACCEPT_RANGES, "bytes")
+        .header("X-Accel-Buffering", "no")
+        .header(HttpHeaders.CONTENT_RANGE, "bytes " + start + "-" + end + "/" + totalSize)
+        .contentLength(regionLength)
+        .body(region);
   }
 }
diff --git a/src/main/java/com/kamco/cd/kamcoback/inference/InferenceResultApiController.java b/src/main/java/com/kamco/cd/kamcoback/inference/InferenceResultApiController.java
index 3fc6a081..91ab9525 100644
--- a/src/main/java/com/kamco/cd/kamcoback/inference/InferenceResultApiController.java
+++ b/src/main/java/com/kamco/cd/kamcoback/inference/InferenceResultApiController.java
@@ -374,8 +374,7 @@ public class InferenceResultApiController {
     Path zipPath = Path.of(path);
 
     // Range + 200/206/416 공통 처리 (추가 헤더 포함)
-    return rangeDownloadResponder.buildZipResponse(
-        zipPath, uid + ".zip", request, Map.of("X-Accel-Buffering", "no"));
+    return rangeDownloadResponder.buildZipResponse(zipPath, uid + ".zip", request);
   }
 
   @Operation(summary = "shp 파일 다운로드 이력 조회", description = "추론관리 분석결과 shp 파일 다운로드 이력 조회")