Check If-None-Match before fulfilling preservation cache

[GregBrimble]

Fixes #000

Before fetching the asset, the client may already have the asset contents cached. Let's check If-None-Match first.

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• Tests
  • TODO (before merge)
  • Tests included
  • Tests not necessary because:
• E2E Tests CI Job required? (Use "e2e" label or ask maintainer to run separately)
  • I don't know
  • Required
  • Not required because: no coverage
• Public documentation
  • TODO (before merge)
  • Cloudflare docs PR(s):
  • Documentation not necessary because: small change

[changeset-bot]

🦋 Changeset detected

Latest commit: 82dcab8

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@cloudflare/pages-shared	Minor

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[github-actions]

A wrangler prerelease is available for testing. You can install this latest build in your project with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/12373506677/npm-package-wrangler-7546

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npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/7546/npm-package-wrangler-7546

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npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/12373506677/npm-package-wrangler-7546 dev path/to/script.js

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wget https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/12373506677/npm-package-cloudflare-workers-bindings-extension-7546 -O ./cloudflare-workers-bindings-extension.0.0.0-v666c281c7.vsix && code --install-extension ./cloudflare-workers-bindings-extension.0.0.0-v666c281c7.vsix

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/12373506677/npm-package-create-cloudflare-7546 --no-auto-update

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npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/12373506677/npm-package-miniflare-7546

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/12373506677/npm-package-cloudflare-pages-shared-7546

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/12373506677/npm-package-cloudflare-unenv-preset-7546

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/12373506677/npm-package-cloudflare-vitest-pool-workers-7546

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/12373506677/npm-package-cloudflare-workers-editor-shared-7546

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/12373506677/npm-package-cloudflare-workers-shared-7546

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Note that these links will no longer work once the GitHub Actions artifact expires.

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[email protected] includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20241205.0
workerd	1.20241205.0	1.20241205.0
workerd --version	1.20241205.0	2024-12-05

Please ensure constraints are pinned, and miniflare/workerd minor versions match.