Как получить длину содержимого Content-Disposition (вложение)

Можно ли получить контент-длину вложенного файла?

У меня есть эта ссылка https://clubdia.dia.es/folletos.html?action=descargarPDF&ID = 3729 это URL, который содержит прикрепленный файл PDF

[Content-Disposition] => Array
(
[0] => attachment;filename=folleto.pdf
)

Когда я пытаюсь свернуть PHP, чтобы получить заголовки, у меня нет длины содержимого, есть ли способ их получить?

Вот мой вывод, пытаясь HEAD запрос этого URL

GuzzleHttp\Psr7\Response Object
(
[reasonPhrase:GuzzleHttp\Psr7\Response:private] => OK
[statusCode:GuzzleHttp\Psr7\Response:private] => 200
[headers:GuzzleHttp\Psr7\Response:private] => Array
(
[Server] => Array
(
[0] => nginx
)

[Date] => Array
(
[0] => Wed, 06 Feb 2019 15:20:36 GMT
)

[Content-Type] => Array
(
[0] => application/octet-stream;charset=UTF-8
)

[Connection] => Array
(
[0] => keep-alive
)

[Cache-Control] => Array
(
[0] => public
)

[Content-Disposition] => Array
(
[0] => attachment;filename=folleto.pdf
)

[Pragma] => Array
(
[0] => public
)

[Strict-Transport-Security] => Array
(
[0] => max-age=31536000; preload
)

[X-Cache] => Array
(
[0] => HIT
)

[Set-Cookie] => Array
(
[0] => visid_incap_1668516=zfz9ZeK+QDC92kl2iIG/xEP7WlwAAAAAQUIPAAAAAAD5iKB9ld5b9IMI9fwQ31Fc; expires=Thu, 06 Feb 2020 12:43:04 GMT; path=/; Domain=.dia.es
[1] => incap_ses_506_1668516=XR+cZwUqgm1tCCZhgK0FB0P7WlwAAAAAoiKqJJxl7/fK+lioQQ/p/g==; path=/; Domain=.dia.es
[2] => ___utmvmkRuIlDmB=dSHXhKBwkUI; path=/; Max-Age=900
[3] => ___utmvakRuIlDmB=wvuCjPl; path=/; Max-Age=900
[4] => ___utmvbkRuIlDmB=NZZ
)

[XhqOoalJ] => Array
(
[0] => itB; path=/; Max-Age=900
)

[X-Iinfo] => Array
(
[0] => 3-30525607-30525067 PNNN RT(1549466435409 36) q(0 0 0 0) r(0 0) U6
)

[X-CDN] => Array
(
[0] => Incapsula
)

)

[headerNames:GuzzleHttp\Psr7\Response:private] => Array
(
[server] => Server
[date] => Date
[content-type] => Content-Type
[connection] => Connection
[cache-control] => Cache-Control
[content-disposition] => Content-Disposition
[pragma] => Pragma
[strict-transport-security] => Strict-Transport-Security
[x-cache] => X-Cache
[set-cookie] => Set-Cookie
[xhqooalj] => XhqOoalJ
[x-iinfo] => X-Iinfo
[x-cdn] => X-CDN
)

[protocol:GuzzleHttp\Psr7\Response:private] => 1.1
[stream:GuzzleHttp\Psr7\Response:private] => GuzzleHttp\Psr7\Stream Object
(
[stream:GuzzleHttp\Psr7\Stream:private] => Resource id #552
[size:GuzzleHttp\Psr7\Stream:private] =>
[seekable:GuzzleHttp\Psr7\Stream:private] => 1
[readable:GuzzleHttp\Psr7\Stream:private] => 1
[writable:GuzzleHttp\Psr7\Stream:private] => 1
[uri:GuzzleHttp\Psr7\Stream:private] => php://temp
[customMetadata:GuzzleHttp\Psr7\Stream:private] => Array
(
)

)

)