curl  --verbose https://nixos.org/channels/nixos-20.09
*   Trying 167.99.129.42:443...
* Connected to nixos.org (167.99.129.42) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384
* ALPN, server accepted to use h2
* Server certificate:
*  subject: CN=*.nixos.org
*  start date: Oct  3 09:11:52 2020 GMT
*  expire date: Jan  1 09:11:52 2021 GMT
*  subjectAltName: host "nixos.org" matched cert's "nixos.org"
*  issuer: C=US; O=Let's Encrypt; CN=Let's Encrypt Authority X3
*  SSL certificate verify ok.
* Using HTTP2, server supports multi-use
* Connection state changed (HTTP/2 confirmed)
* Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0
* Using Stream ID: 1 (easy handle 0xe52830)
> GET /channels/nixos-20.09 HTTP/2
> Host: nixos.org
> user-agent: curl/7.70.0
> accept: */*
> 
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* old SSL session ID is stale, removing
* Connection state changed (MAX_CONCURRENT_STREAMS == 150)!
< HTTP/2 302 
< cache-control: public, max-age=0, must-revalidate
< content-length: 54
< content-type: text/plain; charset=utf-8
< date: Tue, 20 Oct 2020 07:10:29 GMT
< location: https://channels.nixos.org/nixos-20.09
< age: 1073
< server: Netlify
< x-nf-request-id: 0e58387a-a9ef-444f-838f-c6a7b71d4187-3705636
< 
Redirecting to https://channels.nixos.org/nixos-20.09
* Connection #0 to host nixos.org left intact