[w3c/ServiceWorker] NavigationPreloadManager.setHeaderValue should reject invalid header values (PR #1827)

This update adds validation for the header value in NavigationPreloadManager.setHeaderValue() to match the Fetch specification's "header value" definition. It now:
1. Normalizes the input value (stripping HTTP whitespace).
2. Rejects the promise with a TypeError if the value contains invalid bytes (including \r, \n, or \0).

Fixes #1000


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You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1827

-- Commit Summary --

  * NavigationPreloadManager.setHeaderValue should reject invalid header values

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1827.patch
https://github.com/w3c/ServiceWorker/pull/1827.diff

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