http3: document redacting of HTTP header and trailer fields

[marten-seemann]

To be merged after the v0.64.0 release, see quic-go/quic-go#5932.

Note

Document h3qlog.RedactHeaders for HTTP/3 qlog header redaction

Adds a "Redacting Field Values" section to the HTTP/3 qlog docs in qlog.md. The example wraps a connection tracer with h3qlog.RedactHeaders and a callback that replaces values for fields like Authorization, Cookie, and Set-Cookie. The docs note that callbacks receive canonical field names for sent and received headers and trailers, and exclude pseudo-header fields.

^{Macroscope summarized d508869.}

Summary by CodeRabbit

• Documentation
  • Added guidance for redacting HTTP/3 header and trailer values in qlog output, including an example for sensitive fields.

[coderabbitai]

📝 Walkthrough

The HTTP/3 qlog documentation now describes h3qlog.RedactHeaders, including which fields the callback receives and an example that redacts selected values.

Changes: qlog header redaction

Layer / File(s)	Summary
Redaction callback documentation content/docs/http3/qlog.md	Documents that the callback receives canonical names for sent and received header and trailer fields, excluding pseudo-header fields. The example redacts Authorization, Cookie, and Set-Cookie values.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~4 minutes

Change: Other

Merge Risk: 🔵 Low · up to d5088

The documentation example may use a constructor name that does not match the implementation. Confirm the exported name in the released v0.64.0 API before merging this docs change.

Pre-merge checks: 5

Passed checks: 5 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: documenting redaction of HTTP/3 header and trailer fields.
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @content/docs/http3/qlog.md:
- Line 35: Update the qlog documentation example to use the exported
h3qlog.NewHeaderRedactor constructor instead of h3qlog.RedactHeaders, keeping
the existing callback and surrounding tracer example unchanged.

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📥 Commits

Reviewing files that changed from the base of the PR and between 06261b0 and d508869.

📒 Files selected for processing: 1

• content/docs/http3/qlog.md

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