Performance: adjust middleware matcher to solve compression issues

[pettinarip]

Our current implementation has odd behavior when serving static files that are compressed. Depending on the browser, it will serve files using gzip or br, since the same browsers support both algorithms (same req header in all these browsers: Accept-Encoding: gzip, deflate, br, zstd).

We would like to always serve the br version as it is much lighter than the gzip version. For example, the _app.js bundle size drops from ~330kb to ~215kb when using Brotli.

The issue is related to the custom middleware we use to redirect requests to different locales. Currently, we process all incoming requests (which is not necessary) and for some reason this seems to cause a conflict with the netlify server which ends up serving gzip files instead.

Description

This PR adds a custom matcher to the exported middleware config to only process the matched paths and ignore the rest.

[netlify[bot]]

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🔨 Latest commit	f8fc21797232cdccd339c9526f24f2baa4065075
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Lighthouse	7 paths audited Performance: 42 (🔴 down 14 from production) Accessibility: 92 (no change from production) Best Practices: 89 (🔴 down 9 from production) SEO: 93 (🔴 down 2 from production) PWA: - View the detailed breakdown and full score reports

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[github-actions[bot]]

Page	Performance	Accessibility	Best practices	SEO	PWA
/en/	🔴 45	🟢 94	🟢 93	🟢 93	🔴 38
/en/wallets/find-wallet/	🟠 54	🟠 88	🟢 96	🟢 93	🔴 38
/en/staking/	🟠 59	🟢 91	🟢 93	🟢 93	🔴 38
/en/whitepaper/	🟠 68	🟢 95	🟢 96	🟢 93	🔴 38
/en/nft/	🔴 49	🟢 95	🟢 96	🟢 93	🔴 38
/en/developers/docs/intro-to-ethereum/	🟠 71	🟢 94	🟢 96	🟢 93	🔴 38
/en/developers/tutorials/creating-a-wagmi-ui-for-your-contract/	🔴 45	🟠 88	🟢 96	🟢 93	🔴 38

Lighthouse scores are calculated based on the latest audit results

[pettinarip]

@minimalsm @corwintines good catch, there seem to be a few weird things going on with redirects/middleware/trailingslashes with Next 14. Investigating...

[minimalsm]

@coderabbitai review

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Actions Performed

Review triggered.

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[coderabbitai[bot]]

Walkthrough

The recent updates to src/middleware.ts focus on enhancing path exclusion handling and refining the logic for locales and redirects. A config object with a matcher array was introduced to specify paths to exclude. Additionally, variable references within the middleware function were updated for consistency, and URL construction logic was refined to improve locale handling.

Changes

File	Change Summary
src/middleware.ts	Added config object with matcher array, updated variable references, and refined URL construction logic for locale handling.

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Recent Review Details

Configuration used: CodeRabbit UI Review profile: CHILL

Commits

Files that changed from the base of the PR and between 92f3662b4697b85ac1a13a3e520e2c2b016c5e8f and f8fc21797232cdccd339c9526f24f2baa4065075.

Files ignored due to path filters (1)

• netlify.toml is excluded by !**/*.toml

Files selected for processing (1)

• src/middleware.ts (2 hunks)

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