다음과 같은 내용을 확인했습니다(첫 번째 게시물에 있는 이미지와 일치합니다):
'Getting Started Guide’라는 텍스트는 요청이 성공적으로 처리되었음을 보여줍니다. 해당 문자열은 og:title 메타 태그에서 가져오고 있습니다:
<meta property="og:title" content="Getting Started Guide" data-react-helmet="true">
설명이 누락되었다는 오류/경고도 정확합니다. 페이지의 콘텐츠는 다음과 같습니다:
<meta property="og:description" content="" data-react-helmet="true">
이미지 URL은 og:image 태그에서 가져오며, 해당 태그는 다음과 같습니다:
<meta data-react-helmet="true" property="og:image" content="https://app.gitbook.com/share/space/thumbnail/-LA-UVvV3_TgzQyCXMWK.png">
https://app.gitbook.com/share/space/thumbnail/-LA-UVvV3_TgzQyCXMWK.png를 복사하여 브라우저(마카OS의 최신 Safari)에 붙여넣으면 다음 오류 메시지가 표시됩니다:
Error: could not handle the request
curl을 통해 동일한 요청을 수행해도 동일한 응답이 반환됩니다:
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
og:image URL을 복사하여 브라우저에 붙여넣으면 이미지를 볼 수 있습니까?
요약하면: 원본 URL의 응답을 기준으로 볼 때, Onebox 미리보기는 예상대로 작동하는 것으로 보입니다.
하지만 적어도 이는 Discourse의 문제는 아닙니다).
