// Write object header
func setObjectHeaders(ctx context.Context, w http.ResponseWriter, objInfo ObjectInfo, rs *HTTPRangeSpec, opts ObjectOptions) (err error) {
	// set common headers
	setCommonHeaders(w)

	// Set last modified time.
	lastModified := objInfo.ModTime.UTC().Format(http.TimeFormat)
	w.Header().Set(xhttp.LastModified, lastModified)

	// Set Etag if available.
	if objInfo.ETag != "" {

        return collection.isEmpty() ? null : collection.getFirst();
    }

    /**
     * Returns the last element of a sequenced collection.
     *
     * @param <E> the element type
     * @param collection the sequenced collection
     * @return the last element, or null if the collection is empty
     * @since Java 21
     */

	// channel signaled by background routine when traversal has
	// completed
	traverseAndHealDoneCh chan error

	// canceler to cancel heal sequence.
	cancelCtx context.CancelFunc

	// the last result index sent to client
	lastSentResultIndex int64

	// Number of total items scanned against item type
	scannedItemsMap map[madmin.HealItemType]int64

	// Number of total items healed against item type

	// last and unscoped
	sql = DB.ToSQL(func(tx *gorm.DB) *gorm.DB {
		return tx.Model(&User{}).Unscoped().Where(&User{Name: "bar", Age: 12}).Limit(10).Offset(5).Order("name ASC").Last(&User{})
	})

// One 16 MiB is a reasonable max limit.
//
// Then we read the signature and payload data. We compute the SHA256 checksum
// of the payload and verify that it matches the expected signature value.
//
// The last chunk is *always* 0-sized. So, we must only return io.EOF if we have encountered
// a chunk with a chunk size = 0. However, this chunk still has a signature and we must
// verify it.
const maxChunkSize = 16 << 20 // 16 MiB

                            if (log.isDebugEnabled()) {
                                log.debug(String.format("Wrote %d bytes (%d chunks, last partial write %d)", r.getTotalBytesWritten(),
                                        r.getChunksWritten(), r.getChunkBytesWritten()));
                            }
                            ooff += r.getTotalBytesWritten();

* `path` - 📁 📁 🎏.
* `headers` - 🙆 🛃 🎚 🔌, 📖.
* `media_type` - 🎻 🤝 📻 🆎. 🚥 🔢, 📁 ⚖️ ➡ 🔜 ⚙️ 🔑 📻 🆎.
* `filename` - 🚥 ⚒, 👉 🔜 🔌 📨 `Content-Disposition`.

📁 📨 🔜 🔌 ☑ `Content-Length`, `Last-Modified` & `ETag` 🎚.

{* ../../docs_src/custom_response/tutorial009.py hl[2,10] *}

👆 💪 ⚙️ `response_class` 🔢:

{* ../../docs_src/custom_response/tutorial009b.py hl[2,8,10] *}

                Arguments.of(FILE_NOTIFY_CHANGE_ATTRIBUTES, "Attribute changes"), Arguments.of(FILE_NOTIFY_CHANGE_SIZE, "Size changes"),
                Arguments.of(FILE_NOTIFY_CHANGE_LAST_WRITE, "Last write time changes"),
                Arguments.of(FILE_NOTIFY_CHANGE_SECURITY, "Security changes"),
                Arguments.of(FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME, "File and directory name changes"),

	// Is MINIO_SYNC_BOOT set?
	globalEnableSyncBoot bool

	// Contains NIC interface name used for internode communication
	globalInternodeInterface     string
	globalInternodeInterfaceOnce sync.Once

	// Set last client perf extra time (get lock, and validate)
	globalLastClientPerfExtraTime int64

	// Captures all batch jobs metrics globally
	globalBatchJobsMetrics batchJobMetrics

     *
     * Current strategy is based on failure count. In the future, this could be enhanced to consider:
     * - Recent event frequency (successful notifications)
     * - Time since last successful notification
     * - Events per unit time for more adaptive behavior
     *
     * @param handle notification handle
     * @return polling interval in milliseconds
     */