Cannot download big release file

Trying to download this file from a public Github release : https://github.com/Qwant/openmaptiles/releases/download/v3.11-qwant-2021-04-16/osmborder_lines_20210416.csv.gz

length: 1.5GB

I can see the HTTP redirection to objects.githubusercontent.com domain , served by Varnish, but this is not working, after 2 minutes, nothing happen. Our big issue is we use HTTP proxy to download from internet, and after 30 secondes, the connection is cut!


edit:

after 4 minutes:

GET /github-production-release-asset-2e65be/113551895/579ccb80-a69a-11eb-9172-88d2caf8b8ae?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20211109%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20211109T080559Z&X-Amz-Expires=300&X-Amz-Signature=4179509b503015336f943c5495061dc73de72c4403fbad0939caf28d8bd845d8&X-Amz-SignedHeaders=host&actor_id=0&key_id=0&repo_id=113551895&response-content-disposition=attachment%3B%20filename%3Dosmborder_lines_20210416.csv.gz&response-content-type=application%2Foctet-stream HTTP/2
> Host: objects.githubusercontent.com
> User-Agent: curl/7.64.1
> Accept: */*
>
* Connection state changed (MAX_CONCURRENT_STREAMS == 100)!
  0     0    0     0    0     0      0      0 --:--:--  0:04:22 --:--:--     0< HTTP/2 200
< content-type: application/octet-stream
< last-modified: Mon, 16 Aug 2021 18:29:42 GMT
< etag: "0x8D960E3D0951F95"
< server: Windows-Azure-Blob/1.0 Microsoft-HTTPAPI/2.0
< x-ms-request-id: d7f70161-f01e-0020-0d40-d559c2000000
< x-ms-version: 2019-12-12
< x-ms-creation-time: Mon, 16 Aug 2021 18:29:42 GMT
< x-ms-lease-status: unlocked
< x-ms-lease-state: available
< x-ms-blob-type: BlockBlob
< content-disposition: attachment; filename=osmborder_lines_20210416.csv.gz
< x-ms-server-encrypted: true
< fastly-restarts: 1
< accept-ranges: bytes
< date: Tue, 09 Nov 2021 08:10:22 GMT
< via: 1.1 varnish
< age: 201
< x-served-by: cache-cdg20746-CDG
< x-cache: MISS
< x-cache-hits: 0
< x-timer: S1636445160.922172,VS0,VE262266
< content-length: 1607210124
<
{ [884 bytes data]
100 1532M  100 1532M    0     0  4957k      0  0:05:16  0:05:16 --:--:-- 27.3M
* Connection #1 to host objects.githubusercontent.com left intact
* Closing connection 0

but from our infrastructure, proxy is cutting the connection after 30 secondes.