HTTP 416 Range Not Satisfiable

What is HTTP 416 Range Not Satisfiable?

The 416 (Range Not Satisfiable) status code indicates that none of the ranges in the request's Range header field overlap the current extent of the selected resource. The response should include a Content-Range header indicating the valid range.

Common Use Cases

• Requesting a byte range beyond file size
• Broken resumable download clients

// PHP - handling invalid range requests
$fileSize = filesize('video.mp4');
$range = $_SERVER['HTTP_RANGE'] ?? '';

if (!isValidRange($range, $fileSize)) {
    http_response_code(416);
    header("Content-Range: bytes */$fileSize");
    exit;
}