Document that Cloudflare Rocket Loader must be disabled (blank page, third report)
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调研方向
编辑 docs/guide.md 中反向代理部分，在第 279 行附近现有的 Cloudflare Access 引用旁进行修改。先检查周围的措辞和建议的 Rocket Loader 配置规则，然后添加说明：对于 code-server 主机名，必须禁用它。完成标准是指南清楚地说明空白页面的症状以及按主机名限定范围的 Cloudflare 设置。
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描述
What is your suggestion?
Document that Cloudflare's Rocket Loader must be disabled for hostnames serving code-server, in the reverse-proxy section of docs/guide.md (which already references Cloudflare Access around line 279).
Suggested wording:
Cloudflare users: disable Rocket Loader for your code-server hostname. Rocket Loader rewrites inline
<script>tags at the edge, which code-server's Content Security Policy blocks, resulting in a blank page with no visible error. Scope it with a Configuration Rule rather than disabling it zone-wide:Expression: (http.host eq "code.example.com") Setting: Rocket Loader → Off
How will this improve the docs?
This failure has now been reported three times (#1451, #4164, and my own investigation below), always as "white screen behind Cloudflare". It is hard to self-diagnose: every asset returns HTTP 200, the server logs look healthy, and the only symptom is an empty <body> plus a CSP error that does not mention Cloudflare.
The failure became easier to hit in recent releases. Comparing the CSP script-src emitted by two versions:
| 4.130.0 (loads) | 4.138.0 (blank) | |
|---|---|---|
| nonce | 'nonce-1nline-m4p' (static literal) |
random per request |
sha256 hashes |
5 | 2 |
With a static nonce, Rocket Loader's injected inline scripts copy the nonce out of the surrounding markup and still validate. With a per-request nonce and a shorter hash list they do not, so CSP blocks them and the AMD loader fails with Cannot determine URI for module id!.
I reproduced this on two independent machines behind separate Cloudflare Tunnels. Both worked on 4.130.0 and broke immediately after upgrading to 4.138.0, with no Cloudflare configuration change in between. Disabling Rocket Loader for those hostnames fixed both, with no change to the origin.
The underlying CSP change is upstream, not code-server's — patches/csp-hashes.diff is byte-identical between v4.130.0 and v4.138.0, and code serve-web 1.138.0 fails the same way with no code-server in the path. I filed that separately as microsoft/vscode#337226. This request is only about documenting the interaction, since code-server users are the ones who predominantly hit it.
One related note: in #1451 a maintainer mentioned adding "the proper tags so our scripts don't get rocket-loaded by default". That does not appear to be in effect on 4.138.0 — all six bootstrap script tags are still rewritten to type="<hash>-text/javascript". If that mitigation is still wanted, it would remove the need for the docs change; otherwise documenting the workaround seems like the cheaper fix.
Are you interested in submitting a PR for this?
Yes, happy to open a PR against docs/guide.md if you would like the wording above (or something closer to your house style).
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