Encode customization header

[conico974]

Not properly encoding the customization header could cause an issue Vercel Runtime Malformed Response Header Error contains non-ASCII characters.

[linear]

RND-7260 Crash in vercel because of malformed preview

[changeset-bot]

🦋 Changeset detected

Latest commit: 1c0766b

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

This PR includes changesets to release 2 packages

Name	Type
gitbook-v2	Patch
gitbook	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]

Summary of the deployments:

Version 1

Version	URL	Status
Latest commit	https://b4ee084c.gitbook-open.pages.dev	✅
PR	https://pr3289.gitbook-open.pages.dev	✅

Version 2

Version	URL	Status
Vercel	https://gitbook-v2-d8c3ig39d-gitbook.vercel.app	✅
Cloudflare	https://68c2608d-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	v1	2v	2c
GitBook	https://b4ee084c.gitbook-open.pages.dev/gitbook.com/docs	https://gitbook-v2-d8c3ig39d-gitbook.vercel.app/url/gitbook.com/docs	https://68c2608d-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://b4ee084c.gitbook-open.pages.dev/gitbook.gitbook.io/test-gitbook-open	https://gitbook-v2-d8c3ig39d-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://68c2608d-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

[argos-ci]

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Build	Status	Details	Updated (UTC)
customers-v1 (Inspect)	✅ No changes detected	-	Jun 9, 2025, 9:23 AM
customers-v2 (Inspect)	👍 Changes approved	79 changed	Jun 9, 2025, 9:26 AM
default (Inspect)	👍 Changes approved	4 changed	Jun 9, 2025, 9:26 AM
v2-cloudflare (Inspect)	✅ No changes detected	-	Jun 9, 2025, 9:27 AM
v2-vercel (Inspect)	✅ No changes detected	-	Jun 9, 2025, 9:27 AM