diff --git a/weed/s3api/s3_constants/header.go b/weed/s3api/s3_constants/header.go
index 7505e8eca..a232eb189 100644
--- a/weed/s3api/s3_constants/header.go
+++ b/weed/s3api/s3_constants/header.go
@@ -45,7 +45,6 @@ const (
 	AmzObjectTaggingDirective = "X-Amz-Tagging-Directive"
 	AmzTagCount               = "x-amz-tagging-count"
 
-	SeaweedFSPartNumber              = "X-Seaweedfs-Part-Number"
 	SeaweedFSUploadId                = "X-Seaweedfs-Upload-Id"
 	SeaweedFSMultipartPartsCount     = "X-Seaweedfs-Multipart-Parts-Count"
 	SeaweedFSMultipartPartBoundaries = "X-Seaweedfs-Multipart-Part-Boundaries" // JSON: [{part:1,start:0,end:2,etag:"abc"},{part:2,start:2,end:3,etag:"def"}]
diff --git a/weed/server/filer_server_handlers_read.go b/weed/server/filer_server_handlers_read.go
index 977220842..21612a161 100644
--- a/weed/server/filer_server_handlers_read.go
+++ b/weed/server/filer_server_handlers_read.go
@@ -2,8 +2,6 @@ package weed_server
 
 import (
 	"context"
-	"encoding/base64"
-	"encoding/hex"
 	"errors"
 	"fmt"
 	"io"
@@ -160,22 +158,8 @@ func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request)
 		return
 	}
 
-	var etag string
-	if partNumber, errNum := strconv.Atoi(r.Header.Get(s3_constants.SeaweedFSPartNumber)); errNum == nil {
-		if len(entry.Chunks) < partNumber {
-			stats.FilerHandlerCounter.WithLabelValues(stats.ErrorReadChunk).Inc()
-			w.WriteHeader(http.StatusBadRequest)
-			w.Write([]byte("InvalidPart"))
-			return
-		}
-		w.Header().Set(s3_constants.AmzMpPartsCount, strconv.Itoa(len(entry.Chunks)))
-		partChunk := entry.GetChunks()[partNumber-1]
-		md5, _ := base64.StdEncoding.DecodeString(partChunk.ETag)
-		etag = hex.EncodeToString(md5)
-		r.Header.Set("Range", fmt.Sprintf("bytes=%d-%d", partChunk.Offset, uint64(partChunk.Offset)+partChunk.Size-1))
-	} else {
-		etag = filer.ETagEntry(entry)
-	}
+	// Generate ETag for response
+	etag := filer.ETagEntry(entry)
 	w.Header().Set("Accept-Ranges", "bytes")
 
 	// mime type
diff --git a/weed/server/filer_server_handlers_write_autochunk.go b/weed/server/filer_server_handlers_write_autochunk.go
index 4a200cf43..0470b1b8d 100644
--- a/weed/server/filer_server_handlers_write_autochunk.go
+++ b/weed/server/filer_server_handlers_write_autochunk.go
@@ -135,15 +135,9 @@ func (fs *FilerServer) doPutAutoChunk(ctx context.Context, w http.ResponseWriter
 	if err := fs.checkPermissions(ctx, r, fileName); err != nil {
 		return nil, nil, err
 	}
-	// Disable TTL-based (creation time) deletion when S3 expiry (modification time) is enabled
+	// Note: S3 API now sets SeaweedFSExpiresS3 directly in metadata, not via header
+	// TTL handling is done based on metadata, not request headers
 	soMaybeWithOutTTL := so
-	if so.TtlSeconds > 0 {
-		if s3ExpiresValue := r.Header.Get(s3_constants.SeaweedFSExpiresS3); s3ExpiresValue == "true" {
-			clone := *so
-			clone.TtlSeconds = 0
-			soMaybeWithOutTTL = &clone
-		}
-	}
 
 	fileChunks, md5Hash, chunkOffset, err, smallContent := fs.uploadRequestToChunks(ctx, w, r, r.Body, chunkSize, fileName, contentType, contentLength, soMaybeWithOutTTL)
 
@@ -334,9 +328,7 @@ func (fs *FilerServer) saveMetaData(ctx context.Context, r *http.Request, fileNa
 	}
 
 	entry.Extended = SaveAmzMetaData(r, entry.Extended, false)
-	if entry.TtlSec > 0 && r.Header.Get(s3_constants.SeaweedFSExpiresS3) == "true" {
-		entry.Extended[s3_constants.SeaweedFSExpiresS3] = []byte("true")
-	}
+	// Note: S3 API now sets SeaweedFSExpiresS3 directly in metadata via gRPC, not HTTP headers
 	for k, v := range r.Header {
 		if len(v) > 0 && len(v[0]) > 0 {
 			if strings.HasPrefix(k, needle.PairNamePrefix) || k == "Cache-Control" || k == "Expires" || k == "Content-Disposition" {