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fix(web): set no-referrer at document level so B站 cover thumbnails load

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Bilibili's CDN (i*.hdslb.com) returns 403 with `x-error-info:
RefererWhite` for image requests whose Referer is not on their
whitelist. `CoverArt.vue` already sets `referrerpolicy="no-referrer"`
on its `<img>` tag, BUT the `.cover-shadow` div renders the same URL
as a CSS `background-image`, which ignores the img attribute and uses
the document default policy (`strict-origin-when-cross-origin` in
modern Firefox/Chrome) — that sends `Referer: http://localhost:3000/`
and triggers the block.

Setting `<meta name="referrer" content="no-referrer">` in index.html
applies no-referrer site-wide: covers <img> tags, CSS background-image
fetches, and anywhere else CDNs check referer. Doesn't affect our
/api/* CSRF middleware because that uses Origin (still sent by the
browser), not Referer.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
saopig1andClaude Opus 4.7 committed 2026-05-27 20:07:18 +08:00
1 parent 81cd8a2bec
commit c8daa14219
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web/index.html
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@@ -3,6 +3,10 @@
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- Bilibili / NetEase / QQ image CDNs reject requests whose Referer is not on their whitelist.
Setting no-referrer at the document level covers <img> tags AND CSS background-image fetches.
Our own /api/* CSRF check uses Origin (not Referer), so this doesn't break auth. -->
<meta name="referrer" content="no-referrer">
<title>TSMusicBot</title>
<link rel="preconnect" href="https://fonts.googleapis.com">
<link href="https://fonts.googleapis.com/css2?family=Barlow:wght@400;500;600;700;800&display=swap" rel="stylesheet">