case xhttp.Checksum:
		case xhttp.StorageClass:
		case xhttp.ObjectSize:
		case xhttp.ObjectParts:
		default:
			apiErr = errorCodes.ToAPIErr(ErrInvalidAttributeName)
			argumentName = strings.ToLower(xhttp.AmzObjectAttributes)
			argumentValue = tag
			valid = false
			return opts, valid
		}
	}

	return opts, valid
}

	query.Set(xhttp.AmzSignedHeaders, strings.Join(pSignValues.SignedHeaders, ";"))
	query.Set(xhttp.AmzCredential, cred.AccessKey+SlashSeparator+pSignValues.Credential.getScope())

	defaultSigParams := set.CreateStringSet(
		xhttp.AmzContentSha256,
		xhttp.AmzSecurityToken,
		xhttp.AmzAlgorithm,
		xhttp.AmzDate,
		xhttp.AmzExpires,
		xhttp.AmzSignedHeaders,
		xhttp.AmzCredential,
		xhttp.AmzSignature,
	)

			recorder := httptest.NewRecorder()
			request := httptest.NewRequest(http.MethodHead, "/bucket/a", bytes.NewReader([]byte{}))
			request.Header.Set(xhttp.IfNoneMatch, tc.ifNoneMatch)
			request.Header.Set(xhttp.IfModifiedSince, tc.ifModifiedSince)
			request.Header.Set(xhttp.IfMatch, tc.ifMatch)
			request.Header.Set(xhttp.IfUnmodifiedSince, tc.ifUnmodifiedSince)

		}
	}

	for _, objLock := range []string{
		xhttp.AmzObjectLockMode,
		xhttp.AmzObjectLockLegalHold,
		xhttp.AmzObjectLockRetainUntilDate,
	} {
		if values, ok := cloneHeader[objLock]; ok {
			args[strings.TrimPrefix(objLock, "X-Amz-")] = values
		}
		cloneHeader.Del(objLock)
	}

	for key, values := range cloneHeader {
		if strings.EqualFold(key, xhttp.AmzObjectTagging) {
			continue
		}

	if _, ok := metadata[strings.ToLower(xhttp.ContentType)]; !ok {
		metadata[strings.ToLower(xhttp.ContentType)] = "binary/octet-stream"
	}

	// https://github.com/google/security-research/security/advisories/GHSA-76wf-9vgp-pj7w
	for k := range metadata {
		if equals(k, xhttp.AmzMetaUnencryptedContentLength, xhttp.AmzMetaUnencryptedContentMD5) {
			delete(metadata, k)
		}
	}

func corsHandler(handler http.Handler) http.Handler {
	commonS3Headers := []string{
		xhttp.Date,
		xhttp.ETag,
		xhttp.ServerInfo,
		xhttp.Connection,
		xhttp.AcceptRanges,
		xhttp.ContentRange,
		xhttp.ContentEncoding,
		xhttp.ContentLength,
		xhttp.ContentType,
		xhttp.ContentDisposition,
		xhttp.LastModified,
		xhttp.ContentLanguage,
		xhttp.CacheControl,
		xhttp.RetryAfter,

func setEventStreamHeaders(w http.ResponseWriter) {
	w.Header().Set(xhttp.ContentType, "text/event-stream")
	w.Header().Set(xhttp.CacheControl, "no-cache") // nginx to turn off buffering
	w.Header().Set("X-Accel-Buffering", "no")      // nginx to turn off buffering
}

// Write http common headers
func setCommonHeaders(w http.ResponseWriter) {
	// Set the "Server" http header.
	w.Header().Set(xhttp.ServerInfo, MinioStoreName)

		writeResponse(w, http.StatusServiceUnavailable, nil, mimeNone)
		return nil
	}

	if !globalBucketMetadataSys.Initialized() {
		w.Header().Set(xhttp.MinIOServerStatus, "bucket-metadata-offline")
		writeResponse(w, http.StatusServiceUnavailable, nil, mimeNone)
		return nil
	}

	if !globalIAMSys.Initialized() {
		w.Header().Set(xhttp.MinIOServerStatus, "iam-offline")

			objectName := "dummy-object"
			functionID := "lambda1"
			functionToken := "token123"

			// Lambda mock server
			lambdaServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
				w.Header().Set(xhttp.AmzRequestRoute, functionID)
				w.Header().Set(xhttp.AmzRequestToken, functionToken)

var supportedHeadGetReqParams = map[string]string{
	"response-expires":             xhttp.Expires,
	"response-content-type":        xhttp.ContentType,
	"response-cache-control":       xhttp.CacheControl,
	"response-content-encoding":    xhttp.ContentEncoding,
	"response-content-language":    xhttp.ContentLanguage,
	"response-content-disposition": xhttp.ContentDisposition,
}

const (
	compressionAlgorithmV1 = "golang/snappy/LZ77"