Vedo quanto segue (che corrisponde all’immagine nel tuo primo post):
Il testo ‘Getting Started Guide’ ci indica che la richiesta è andata a buon fine: sta estraendo quella stringa dal tag meta og:title:
<meta property="og:title" content="Getting Started Guide" data-react-helmet="true">
L’errore/avviso che la descrizione manca è anch’esso corretto. Il contenuto della pagina è il seguente:
<meta property="og:description" content="" data-react-helmet="true">
L’URL dell’immagine proviene dal tag og:image, che è così definito:
<meta data-react-helmet="true" property="og:image" content="https://app.gitbook.com/share/space/thumbnail/-LA-UVvV3_TgzQyCXMWK.png">
Se copio e incollo https://app.gitbook.com/share/space/thumbnail/-LA-UVvV3_TgzQyCXMWK.png nel mio browser (Safari recente su MacOS), ricevo un errore che dice:
Error: could not handle the request
Effettuando la stessa richiesta tramite curl ottengo la stessa risposta:
curl -v https://app.gitbook.com/share/space/thumbnail/-LA-UVvV3_TgzQyCXMWK.png
* Trying 104.18.8.111...
* TCP_NODELAY set
* Connected to app.gitbook.com (104.18.8.111) 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-CHACHA20-POLY1305
* ALPN, server accepted to use h2
* Server certificate:
* subject: C=US; ST=California; L=San Francisco; O=Cloudflare, Inc.; CN=sni.cloudflaressl.com
* start date: Jun 16 00:00:00 2021 GMT
* expire date: Jun 15 23:59:59 2022 GMT
* subjectAltName: host "app.gitbook.com" matched cert's "*.gitbook.com"
* issuer: C=US; O=Cloudflare, Inc.; CN=Cloudflare Inc ECC CA-3
* 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 0x142809200)
> GET /share/space/thumbnail/-LA-UVvV3_TgzQyCXMWK.png HTTP/2
> Host: app.gitbook.com
> User-Agent: curl/7.64.1
> Accept: */*
>
* Connection state changed (MAX_CONCURRENT_STREAMS == 256)!
< HTTP/2 500
< date: Mon, 23 Aug 2021 17:40:04 GMT
< content-type: text/plain; charset=utf-8
< content-length: 36
< cf-ray: 68361fb8ea9b4009-YYZ
< age: 432
< vary: Accept-Encoding
< via: magic cache
< cf-cache-status: HIT
< expect-ct: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
< x-cache: HIT
< x-cloud-trace-context: 9d4cbd24a15138451c88b2ced35a32f1;o=1
< x-content-type-options: nosniff
< x-magic-hash: f46ac4bf6b6dc125a68e9ad566b48481631bb27eec2165532a7c0f538e93c4f6
< x-release: gitbook-28427-6.25.14
< server: cloudflare
<
Error: could not handle the request
* Connection #0 to host app.gitbook.com left intact
* Closing connection 0
Riesci a vedere un’immagine se copi e incoll l’URL og:image nel tuo browser?
In sintesi: l’anteprima Onebox sembra comportarsi come previsto, in base alla risposta ottenuta dall’URL originale.