FA-6915 / Content negotiation / Member archive

Vary header union is case insensitive and stable · case 05

Vary header union is case insensitive and stable.

Member previewVariant 5 · 3 implementations · 4 checks per implementation

Case contract

Bounded offline decision model: vary header union is case insensitive and stable. Inputs are already validated protocol fields; the explicit fixtures define the supported policy, not a complete protocol implementation.

Why this case matters

This deterministic content negotiation model isolates the vary-header-union-is-case-insensitive-and-stable policy at a network component boundary.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
fixture 4	`["A"]`	`["a"]`	Failed

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