Fix MCP in production

[SamyPesse]

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Latest commit: c7a304a

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[github-actions]

Summary of the deployments:

Version	URL	Status
Vercel	https://gitbook-v2-22k39hjjq-gitbook.vercel.app	✅
Cloudflare	https://5696d204-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-22k39hjjq-gitbook.vercel.app/url/gitbook.com/docs	https://5696d204-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-22k39hjjq-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://5696d204-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

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Build	Status	Details	Updated (UTC)
customers-v2 (Inspect)	👍 Changes approved	3 changed	Sep 12, 2025, 12:55 PM
v2-cloudflare (Inspect)	✅ No changes detected	-	Sep 12, 2025, 12:58 PM
v2-vercel (Inspect)	✅ No changes detected	-	Sep 12, 2025, 12:57 PM

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

[P1] Preserve query parameters when reconstructing MCP request

The new handler rebuilds the request object with new Request(context.linker.toAbsoluteURL(context.linker.toPathInSite('~gitbook/mcp')), nextRequest). This replaces the original URL, but it discards any search string that may have been present because the first argument is just a bare path without nextRequest.nextUrl.search. Middlewares explicitly copy request.nextUrl.search when rewriting, so callers can pass data via query parameters. After this change, any MCP call that relies on query parameters (e.g. authentication or debug flags) will stop receiving them. Consider appending nextRequest.nextUrl.search to the constructed URL before creating the new Request.

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