`fetch_response` 拒绝 HTTP 202 导致 IMDB 卡片失效

zogstrip · 2026年七月16日 09:56

看起来 imdb.com 位于一个 WAF（Web 应用防火墙）之后，该防火墙会阻止抓取（从而也阻止了一键嵌入功能），所以我们恐怕对此无能为力，只能改进向用户显示的错误提示信息

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" />

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`fetch_response` 拒绝 HTTP 202 导致 IMDB 卡片失效

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