Post unsuccessful: status 400 about diag HOT 8 CLOSED

*   Trying 45.90.30.0...
* TCP_NODELAY set
* Connected to dns.nextdns.io (45.90.30.0) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*   CAfile: /etc/ssl/cert.pem
  CApath: none
* TLSv1.2 (OUT), TLS handshake, Client hello (1):
* TLSv1.2 (IN), TLS handshake, Server hello (2):
* TLSv1.2 (IN), TLS handshake, Certificate (11):
* TLSv1.2 (IN), TLS handshake, Server key exchange (12):
* TLSv1.2 (IN), TLS handshake, Server finished (14):
* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
* TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.2 (OUT), TLS handshake, Finished (20):
* TLSv1.2 (IN), TLS change cipher, Change cipher spec (1):
* TLSv1.2 (IN), TLS handshake, Finished (20):
* SSL connection using TLSv1.2 / ECDHE-ECDSA-AES128-GCM-SHA256
* ALPN, server accepted to use h2
* Server certificate:
*  subject: CN=nextdns.io
*  start date: Dec 20 15:08:19 2020 GMT
*  expire date: Mar 20 15:08:19 2021 GMT
*  subjectAltName: host "dns.nextdns.io" matched cert's "dns.nextdns.io"
*  issuer: C=US; O=Let's Encrypt; CN=R3
*  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 0x7feeda00d600)
> GET /info HTTP/2
> Host: dns.nextdns.io
> User-Agent: curl/7.64.1
> Accept: */*
> 
* Connection state changed (MAX_CONCURRENT_STREAMS == 50)!
< HTTP/2 200 
< access-control-allow-origin: *
< content-type: application/json
< strict-transport-security: max-age=63072000; includeSubDomains; preload
< timing-allow-origin: *
< content-length: 86
< date: Sat, 02 Jan 2021 19:39:23 GMT
< 
* Connection #0 to host dns.nextdns.io left intact
{"locationName": "🇺🇸 Atlanta, United States", "pop": "anexia-atl", "rtt": 22454}* Closing connection 0

Post unsuccessful: status 500
Internal Server Error%