gzhttp: Canonicalize ETag header

[justinmayhew]

This ensures the fast-path is hit in the net/http header functions for a minor speed improvement.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: b819dd18-81ca-4496-9e4e-fec2cc57d9f0

📥 Commits

Reviewing files that changed from the base of the PR and between c5e0077 and 3b2e70e.

📒 Files selected for processing (2)

• gzhttp/compress.go
• gzhttp/compress_test.go

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📝 Walkthrough

Walkthrough

The ETag header name is being changed from "ETag" to "Etag" across the gzip compression module and its corresponding tests. Both production code and test cases are updated consistently with this change.

Changes

Cohort / File(s)	Summary
ETag Header Renaming gzhttp/compress.go, gzhttp/compress_test.go	Updated the ETag header string constant from "ETag" to "Etag" in both the compression handler implementation and all associated test setup/assertions.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• gzhttp: Add zstandard to server handler wrapper #1121: Modifies ETag header handling in gzhttp/compress.go for gzip/zstd support, directly related to this header name standardization.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'gzhttp: Canonicalize ETag header' accurately summarizes the main change: converting the ETag header string from non-canonical 'ETag' to canonical 'Etag' format for performance optimization.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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