Fix headers in wfp dev

[GregBrimble]

What this PR solves / how to test

Fixes CUSTESC-45403.

Author has addressed the following

• Tests
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  • Tests included
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• E2E Tests CI Job required? (Use "e2e" label or ask maintainer to run separately)
  • I don't know
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  • Not required because: no e2e coverage
• Changeset (Changeset guidelines)
  • TODO (before merge)
  • Changeset included
  • Changeset not necessary because: not managed with changesets
• Public documentation
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  • Cloudflare docs PR(s):
  • Documentation not necessary because: not yet in main branch

[changeset-bot]

⚠️ No Changeset found

Latest commit: bfd9dd6

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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/11206851323/npm-package-wrangler-6904

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

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/6904/npm-package-wrangler-6904

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11206851323/npm-package-wrangler-6904 dev path/to/script.js

Additional artifacts:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11206851323/npm-package-create-cloudflare-6904 --no-auto-update

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11206851323/npm-package-cloudflare-kv-asset-handler-6904

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11206851323/npm-package-miniflare-6904

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11206851323/npm-package-cloudflare-pages-shared-6904

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/11206851323/npm-package-cloudflare-vitest-pool-workers-6904

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

---

[email protected] includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20240405.1
workerd	1.20240405.0	1.20240405.0
workerd --version	1.20240405.0	2024-04-05

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

[GregBrimble]

I'm not sure if host here should be preserved or overwritten. Need to check what prod runtime behavior is.