vlueprint-sparql

$ curl -X POST 'https://vlueprint.org/sparql' -H 'Content-Type: application/sparql-query' -H 'Accept: "application/sparql-results+json"' -d @foo.query -vvv
Note: Unnecessary use of -X or --request, POST is already inferred.
*   Trying 216.239.34.21:443...                                                                                                                  * Connected to vlueprint.org (216.239.34.21) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*   CAfile: /etc/ssl/certs/ca-certificates.crt
  CApath: none
* 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=vlueprint.org                                                                                                                     *  start date: May 14 01:41:43 2020 GMT
*  expire date: Aug 12 01:41:43 2020 GMT                                                                                                         *  subjectAltName: host "vlueprint.org" matched cert's "vlueprint.org"
*  issuer: C=US; O=Google Trust Services; CN=GTS CA 1D2
*  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 0x55fe951749f0)                                                                                                > POST /sparql HTTP/2                                                                                                                            > Host: vlueprint.org
> user-agent: curl/7.71.1
> content-type: application/sparql-query                                                                                                         > accept: "application/sparql-results+json"
> content-length: 196
>                                                                                                                                                * We are completely uploaded and fine                                                                                                            * Connection state changed (MAX_CONCURRENT_STREAMS == 100)!                                                                                      < HTTP/2 503
< content-type: text/plain
< date: Mon, 06 Jul 2020 19:12:07 GMT
< server: Google Frontend
< content-length: 95  
                                                                                                                                   * Connection #0 to host vlueprint.org left intact
Service Unavailable