[Backport 21.2.X] skip transfer cache for credentialed requests and uncacheable request/responses#69098
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Treat HttpClient requests using `credentials: 'include'` and `same-origin` as credentialed when deciding whether a response can be stored in the HTTP transfer cache. The transfer cache already skips requests with `withCredentials`, `Cookie`, `Authorization`, or `Proxy-Authorization` because those responses may contain user-specific data. Fetch-backed requests can express the same credentialed behavior through the `credentials` option, so these responses must not be serialized into the SSR HTML. This keeps credentialed SSR responses out of TransferState and aligns the cache eligibility check with the fetch request options supported by HttpClient. (cherry picked from commit 8ec0197)
Do not store HTTP transfer cache entries when either the request or response uses `Cache-Control: no-store`, `Cache-Control: private`, or `Cache-Control: no-cache`. Also skip transfer cache when requests use the Fetch API `cache` option with `no-store` or `no-cache`. Because transfer cache serializes SSR HTTP responses into the rendered HTML, Angular now treats these directives conservatively to avoid exposing sensitive or explicitly uncacheable data through `TransferState`. (cherry picked from commit 4d15015) (cherry picked from commit 64ce11f)
JeanMeche
approved these changes
Jun 2, 2026
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Backport of #69017