[Backport 20.3.X] fix(platform-server): reject protocol-relative paths in resolveUrl - #71078
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Previously, resolveUrl only checked whether the raw URL string started with '//' before WHATWG URL resolution. When given an input such as '/.//evil.test', WHATWG dot-segment normalization popped the leading '/.', leaving a pathname starting with '//'. This corrupted ServerPlatformLocation and led to protocol-relative open redirects in SSR. Now, resolveUrl also verifies that the normalized URL pathname does not start with '//' when allowProtocolRelative is false. Fixes angular#71076
JeanMeche
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Sep 30, 2026
alan-agius4
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Backport of #71077 to 20.3.x.