`fetch_response` が HTTP 202 を拒否し、IMDB のワンボックスを破壊

zogstrip · 2026 年 7 月 16 日午前 9:56

imdb.com はスクレイピング（したがってワンボックス表示）を防止する WAF の背後にあるようですので、ユーザーに表示されるメッセージを改善する以外には、あまりできることがない恐怕です。

github.com/discourse/discourse

UX: Explain bot verification challenges in onebox error previews (#41764)

main ← onebox-bot-challenge-message

merged 01:49PM - 16 Jul 26 UTC

ZogStriP

+77 -0

Previously, when a site behind a bot-protection service answered a onebox fetch …with a JavaScript challenge — IMDb, for example, currently returns `202 Accepted` with an AWS WAF challenge page — the preview showed the baffling "the web server returned an error code of 202", a success code presented as an error with no hint of the actual cause. This change detects the documented challenge headers (AWS WAF's `x-amzn-waf-action` and Cloudflare's `cf-mitigated`) in `FinalDestination` and shows a message explaining that the site requires visitors to pass a verification step in a web browser. Accepting 2xx statuses beyond 200 instead would not help: the challenge response carries no OpenGraph data, so the onebox would just come out silently blank. Reported in https://meta.discourse.org/t/407725 **BEFORE** <img width="726" height="605" alt="2026-07-16 @ 09 51 32" src="https://github.com/user-attachments/assets/929b116d-d07a-4aca-a655-6c4b1d0db607" /> **AFTER** <img width="718" height="685" alt="2026-07-16 @ 09 52 10" src="https://github.com/user-attachments/assets/7b555557-6cb4-40ac-a7dc-32bf2515e357" />

トピック		返信	表示
Onebox Does Not Display - iFramely Passes Support	3	1311	2019 年 5 月 2 日
Onebox previews are not working for my site Support onebox	4	277	2024 年 2 月 23 日
Downloading of .webp images in oneboxes is broken Bug	9	1740	2021 年 2 月 11 日
Strange onebox failure due to malformed 404 Support onebox	7	744	2019 年 3 月 22 日
Onebox requests being incorrectly redirected due to user-agent Support	18	1842	2019 年 6 月 19 日

`fetch_response` が HTTP 202 を拒否し、IMDB のワンボックスを破壊

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