Return not found when decodeURIComponent from params fail

[jpreynat]

Some requests are currently failing when receiving either invalid or spam requests for page params that include invalid characters.

Our current code to extract the params uses decodeURIComponent without any safeguard, leading to crashing the whole Node process, which is even more problematic with fluid computing on Vercel.

This PR prevents this problem by returning a 404 Not found on such requests on decoding errors.

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Latest commit: ee404e7

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[github-actions]

Summary of the deployments:

Version	URL	Status
Vercel	https://gitbook-v2-f1eymg7m1-gitbook.vercel.app	✅
Cloudflare	https://d509d359-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-f1eymg7m1-gitbook.vercel.app/url/gitbook.com/docs	https://d509d359-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-f1eymg7m1-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://d509d359-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	1 changed	Dec 12, 2025, 12:10 PM
v2-cloudflare (Inspect)	👍 Changes approved	15 changed	Dec 12, 2025, 12:15 PM
v2-vercel (Inspect)	👍 Changes approved	41 changed	Dec 12, 2025, 12:15 PM

[conico974]

The PR itself is good, but I don't think this is the real issue. If you throw in any of these locally it won't crash the Node process.
The problem is in Vercel (or Next minimal mode, not sure which one), nothing of what we do is supposed to crash the entire Node process