diff --git a/backend/posix/posix.go b/backend/posix/posix.go
index c23aca51..e23f0223 100644
--- a/backend/posix/posix.go
+++ b/backend/posix/posix.go
@@ -101,7 +101,7 @@ func (p *Posix) ListBuckets() (*s3.ListBucketsOutput, error) {
 
 func (p *Posix) HeadBucket(bucket string) (*s3.HeadBucketOutput, error) {
 	_, err := os.Lstat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -125,7 +125,7 @@ func (p *Posix) PutBucket(bucket string) error {
 
 func (p *Posix) DeleteBucket(bucket string) error {
 	names, err := os.ReadDir(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -157,7 +157,7 @@ func (p *Posix) CreateMultipartUpload(mpu *s3.CreateMultipartUploadInput) (*s3.C
 	object := *mpu.Key
 
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -205,7 +205,7 @@ func (p *Posix) CreateMultipartUpload(mpu *s3.CreateMultipartUploadInput) (*s3.C
 
 func (p *Posix) CompleteMultipartUpload(bucket, object, uploadID string, parts []types.Part) (*s3.CompleteMultipartUploadOutput, error) {
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -322,7 +322,7 @@ func (p *Posix) checkUploadIDExists(bucket, object, uploadID string) ([32]byte,
 	objdir := filepath.Join(bucket, metaTmpMultipartDir, fmt.Sprintf("%x", sum))
 
 	_, err := os.Stat(filepath.Join(objdir, uploadID))
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return [32]byte{}, s3err.GetAPIError(s3err.ErrNoSuchUpload)
 	}
 	if err != nil {
@@ -331,7 +331,7 @@ func (p *Posix) checkUploadIDExists(bucket, object, uploadID string) ([32]byte,
 	return sum, nil
 }
 
-func loadUserMetaData(path string, m map[string]string) (tag, contentType, contentEncoding string) {
+func loadUserMetaData(path string, m map[string]string) (contentType, contentEncoding string) {
 	ents, err := xattr.List(path)
 	if err != nil || len(ents) == 0 {
 		return
@@ -351,16 +351,7 @@ func loadUserMetaData(path string, m map[string]string) (tag, contentType, conte
 		m[strings.TrimPrefix(e, "user.")] = string(b)
 	}
 
-	b, err := xattr.Get(path, "user."+tagHdr)
-	tag = string(b)
-	if err != nil {
-		tag = ""
-	}
-	if tag != "" {
-		m[tagHdr] = tag
-	}
-
-	b, err = xattr.Get(path, "user.content-type")
+	b, err := xattr.Get(path, "user.content-type")
 	contentType = string(b)
 	if err != nil {
 		contentType = ""
@@ -470,7 +461,7 @@ func (p *Posix) AbortMultipartUpload(mpu *s3.AbortMultipartUploadInput) error {
 	uploadID := *mpu.UploadId
 
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -498,7 +489,7 @@ func (p *Posix) ListMultipartUploads(mpu *s3.ListMultipartUploadsInput) (*s3.Lis
 	bucket := *mpu.Bucket
 
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -588,7 +579,7 @@ func (p *Posix) ListMultipartUploads(mpu *s3.ListMultipartUploadsInput) (*s3.Lis
 
 func (p *Posix) ListObjectParts(bucket, object, uploadID string, partNumberMarker int, maxParts int) (*s3.ListPartsOutput, error) {
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -603,7 +594,7 @@ func (p *Posix) ListObjectParts(bucket, object, uploadID string, partNumberMarke
 	objdir := filepath.Join(bucket, metaTmpMultipartDir, fmt.Sprintf("%x", sum))
 
 	ents, err := os.ReadDir(filepath.Join(objdir, uploadID))
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchUpload)
 	}
 	if err != nil {
@@ -673,7 +664,7 @@ func (p *Posix) ListObjectParts(bucket, object, uploadID string, partNumberMarke
 
 func (p *Posix) PutObjectPart(bucket, object, uploadID string, part int, length int64, r io.Reader) (string, error) {
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return "", s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -711,7 +702,7 @@ func (p *Posix) PutObjectPart(bucket, object, uploadID string, part int, length
 
 func (p *Posix) PutObject(po *s3.PutObjectInput) (string, error) {
 	_, err := os.Stat(*po.Bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return "", s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -783,7 +774,7 @@ func (p *Posix) PutObject(po *s3.PutObjectInput) (string, error) {
 
 func (p *Posix) DeleteObject(bucket, object string) error {
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -791,7 +782,7 @@ func (p *Posix) DeleteObject(bucket, object string) error {
 	}
 
 	os.Remove(filepath.Join(bucket, object))
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return s3err.GetAPIError(s3err.ErrNoSuchKey)
 	}
 	if err != nil {
@@ -845,7 +836,7 @@ func (p *Posix) DeleteObjects(bucket string, objects *s3.DeleteObjectsInput) err
 
 func (p *Posix) GetObject(bucket, object, acceptRange string, startOffset, length int64, writer io.Writer) (*s3.GetObjectOutput, error) {
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -854,7 +845,7 @@ func (p *Posix) GetObject(bucket, object, acceptRange string, startOffset, lengt
 
 	objPath := filepath.Join(bucket, object)
 	fi, err := os.Stat(objPath)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchKey)
 	}
 	if err != nil {
@@ -867,7 +858,7 @@ func (p *Posix) GetObject(bucket, object, acceptRange string, startOffset, lengt
 	}
 
 	f, err := os.Open(objPath)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchKey)
 	}
 	if err != nil {
@@ -883,7 +874,7 @@ func (p *Posix) GetObject(bucket, object, acceptRange string, startOffset, lengt
 
 	userMetaData := make(map[string]string)
 
-	_, contentType, contentEncoding := loadUserMetaData(objPath, userMetaData)
+	contentType, contentEncoding := loadUserMetaData(objPath, userMetaData)
 
 	b, err := xattr.Get(objPath, "user.etag")
 	etag := string(b)
@@ -910,7 +901,7 @@ func (p *Posix) GetObject(bucket, object, acceptRange string, startOffset, lengt
 
 func (p *Posix) HeadObject(bucket, object string) (*s3.HeadObjectOutput, error) {
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -919,7 +910,7 @@ func (p *Posix) HeadObject(bucket, object string) (*s3.HeadObjectOutput, error)
 
 	objPath := filepath.Join(bucket, object)
 	fi, err := os.Stat(objPath)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchKey)
 	}
 	if err != nil {
@@ -927,7 +918,7 @@ func (p *Posix) HeadObject(bucket, object string) (*s3.HeadObjectOutput, error)
 	}
 
 	userMetaData := make(map[string]string)
-	_, contentType, contentEncoding := loadUserMetaData(objPath, userMetaData)
+	contentType, contentEncoding := loadUserMetaData(objPath, userMetaData)
 
 	b, err := xattr.Get(objPath, "user.etag")
 	etag := string(b)
@@ -947,7 +938,7 @@ func (p *Posix) HeadObject(bucket, object string) (*s3.HeadObjectOutput, error)
 
 func (p *Posix) CopyObject(srcBucket, srcObject, DstBucket, dstObject string) (*s3.CopyObjectOutput, error) {
 	_, err := os.Stat(srcBucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -955,7 +946,7 @@ func (p *Posix) CopyObject(srcBucket, srcObject, DstBucket, dstObject string) (*
 	}
 
 	_, err = os.Stat(DstBucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -964,7 +955,7 @@ func (p *Posix) CopyObject(srcBucket, srcObject, DstBucket, dstObject string) (*
 
 	objPath := filepath.Join(srcBucket, srcObject)
 	f, err := os.Open(objPath)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchKey)
 	}
 	if err != nil {
@@ -992,7 +983,7 @@ func (p *Posix) CopyObject(srcBucket, srcObject, DstBucket, dstObject string) (*
 
 func (p *Posix) ListObjects(bucket, prefix, marker, delim string, maxkeys int) (*s3.ListObjectsOutput, error) {
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -1020,7 +1011,7 @@ func (p *Posix) ListObjects(bucket, prefix, marker, delim string, maxkeys int) (
 
 func (p *Posix) ListObjectsV2(bucket, prefix, marker, delim string, maxkeys int) (*s3.ListObjectsV2Output, error) {
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -1048,7 +1039,7 @@ func (p *Posix) ListObjectsV2(bucket, prefix, marker, delim string, maxkeys int)
 
 func (p *Posix) GetTags(bucket, object string) (map[string]string, error) {
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return nil, s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -1081,7 +1072,7 @@ func (p *Posix) getXattrTags(bucket, object string) (map[string]string, error) {
 
 func (p *Posix) SetTags(bucket, object string, tags map[string]string) error {
 	_, err := os.Stat(bucket)
-	if err != nil && errors.Is(err, fs.ErrNotExist) {
+	if errors.Is(err, fs.ErrNotExist) {
 		return s3err.GetAPIError(s3err.ErrNoSuchBucket)
 	}
 	if err != nil {
@@ -1089,7 +1080,14 @@ func (p *Posix) SetTags(bucket, object string, tags map[string]string) error {
 	}
 
 	if tags == nil {
-		return xattr.Remove(filepath.Join(bucket, object), "user."+tagHdr)
+		err = xattr.Remove(filepath.Join(bucket, object), "user."+tagHdr)
+		if errors.Is(err, fs.ErrNotExist) {
+			return s3err.GetAPIError(s3err.ErrNoSuchKey)
+		}
+		if err != nil {
+			return fmt.Errorf("remove tags: %w", err)
+		}
+		return nil
 	}
 
 	b, err := json.Marshal(tags)
diff --git a/go.mod b/go.mod
index 32d30a1c..3a665e9f 100644
--- a/go.mod
+++ b/go.mod
@@ -5,10 +5,10 @@ go 1.20
 require (
 	github.com/aws/aws-sdk-go-v2 v1.18.0
 	github.com/aws/aws-sdk-go-v2/service/s3 v1.33.1
-	github.com/gofiber/fiber/v2 v2.45.0
-	github.com/valyala/fasthttp v1.47.0
+	github.com/gofiber/fiber/v2 v2.46.0
 	github.com/google/uuid v1.3.0
 	github.com/pkg/xattr v0.4.9
+	github.com/valyala/fasthttp v1.47.0
 	golang.org/x/sys v0.8.0
 )
 
@@ -25,7 +25,7 @@ require (
 	github.com/aws/smithy-go v1.13.5 // indirect
 	github.com/klauspost/compress v1.16.5 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
-	github.com/mattn/go-isatty v0.0.18 // indirect
+	github.com/mattn/go-isatty v0.0.19 // indirect
 	github.com/mattn/go-runewidth v0.0.14 // indirect
 	github.com/philhofer/fwd v1.1.2 // indirect
 	github.com/rivo/uniseg v0.4.4 // indirect
diff --git a/go.sum b/go.sum
index 6ab0e03f..ffd65b53 100644
--- a/go.sum
+++ b/go.sum
@@ -23,8 +23,8 @@ github.com/aws/aws-sdk-go-v2/service/s3 v1.33.1/go.mod h1:J9kLNzEiHSeGMyN7238EjJ
 github.com/aws/smithy-go v1.13.5 h1:hgz0X/DX0dGqTYpGALqXJoRKRj5oQ7150i5FdTePzO8=
 github.com/aws/smithy-go v1.13.5/go.mod h1:Tg+OJXh4MB2R/uN61Ko2f6hTZwB/ZYGOtib8J3gBHzA=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/gofiber/fiber/v2 v2.45.0 h1:p4RpkJT9GAW6parBSbcNFH2ApnAuW3OzaQzbOCoDu+s=
-github.com/gofiber/fiber/v2 v2.45.0/go.mod h1:DNl0/c37WLe0g92U6lx1VMQuxGUQY5V7EIaVoEsUffc=
+github.com/gofiber/fiber/v2 v2.46.0 h1:wkkWotblsGVlLjXj2dpgKQAYHtXumsK/HyFugQM68Ns=
+github.com/gofiber/fiber/v2 v2.46.0/go.mod h1:DNl0/c37WLe0g92U6lx1VMQuxGUQY5V7EIaVoEsUffc=
 github.com/google/go-cmp v0.5.8 h1:e6P7q2lk1O+qJJb4BtCQXlK8vWEO8V1ZeuEdJNOqZyg=
 github.com/google/go-cmp v0.5.8/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
@@ -36,8 +36,8 @@ github.com/klauspost/compress v1.16.5/go.mod h1:ntbaceVETuRiXiv4DpjP66DpAtAGkEQs
 github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
 github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=
 github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
-github.com/mattn/go-isatty v0.0.18 h1:DOKFKCQ7FNG2L1rbrmstDN4QVRdS89Nkh85u68Uwp98=
-github.com/mattn/go-isatty v0.0.18/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/mattn/go-isatty v0.0.19 h1:JITubQf0MOLdlGRuRq+jtsDlekdYPia9ZFsB8h/APPA=
+github.com/mattn/go-isatty v0.0.19/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
 github.com/mattn/go-runewidth v0.0.14 h1:+xnbZSEeDbOIg5/mE6JF0w6n9duR1l3/WmbinWVwUuU=
 github.com/mattn/go-runewidth v0.0.14/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
 github.com/philhofer/fwd v1.1.1/go.mod h1:gk3iGcWd9+svBvR0sR+KPcfE+RNWozjowpeBVG3ZVNU=