Omit Content-Type header for files of unknown extension in Workers Assets

[GregBrimble]

Fixes WC-3028.

The third part of #8247. Before merging, we need backend API support for "application/null".

---

• Tests
  • TODO (before merge)
  • Tests included
  • Tests not necessary because:
• Wrangler 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): https://github.com/cloudflare/cloudflare-docs/pull/20263/files
  • Documentation not necessary because:

[changeset-bot]

🦋 Changeset detected

Latest commit: 8da34c1

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

This PR includes changesets to release 2 packages

Name	Type
wrangler	Minor
@cloudflare/vitest-pool-workers	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[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/13523171665/npm-package-wrangler-8248

You can reference the automatically updated head of this PR with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/8248/npm-package-wrangler-8248

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/13523171665/npm-package-wrangler-8248 dev path/to/script.js

Additional artifacts:

cloudflare-workers-bindings-extension:

wget https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/13523171665/npm-package-cloudflare-workers-bindings-extension-8248 -O ./cloudflare-workers-bindings-extension.0.0.0-vb8acc28b4.vsix && code --install-extension ./cloudflare-workers-bindings-extension.0.0.0-vb8acc28b4.vsix

create-cloudflare:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/13523171665/npm-package-create-cloudflare-8248 --no-auto-update

@cloudflare/kv-asset-handler:

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/13523171665/npm-package-cloudflare-kv-asset-handler-8248

miniflare:

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/13523171665/npm-package-miniflare-8248

@cloudflare/pages-shared:

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/13523171665/npm-package-cloudflare-pages-shared-8248

@cloudflare/unenv-preset:

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/13523171665/npm-package-cloudflare-unenv-preset-8248

@cloudflare/vite-plugin:

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/13523171665/npm-package-cloudflare-vite-plugin-8248

@cloudflare/vitest-pool-workers:

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/13523171665/npm-package-cloudflare-vitest-pool-workers-8248

@cloudflare/workers-editor-shared:

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/13523171665/npm-package-cloudflare-workers-editor-shared-8248

@cloudflare/workers-shared:

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/13523171665/npm-package-cloudflare-workers-shared-8248

@cloudflare/workflows-shared:

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/13523171665/npm-package-cloudflare-workflows-shared-8248

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

---

wrangler@3.109.3 includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20250214.0
workerd	1.20250214.0	1.20250214.0
workerd --version	1.20250214.0	2025-02-14

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

[lrapoport-cf]

for posterity: @GregBrimble confirmed that the API part had been released and tested it manually before merging