INNER CODE UNIT · TypeScript

applyExperiments

namecheap/ilc · ilc/server/experiments/index.ts:92

export function applyExperiments(
    request: PatchedFastifyRequest,
    reply: ServerResponseFastifyReply,
    rulesetOverride: Ruleset = defaultRulesetProvider.getRuleset(),
): void {
    // i18n (which runs first) may already have redirected and flushed the response;
    // appending a Set-Cookie then would throw ERR_HTTP_HEADERS_SENT.
    if (reply.sent) {
        return;
    }

    request.raw.ilcState = request.raw.ilcState ?? {};

    const secure = config.get('client.protocol') === 'https' || forwardedProtoIsHttps(request);

    // Kill-switch: when disabled, resolve against an EMPTY ruleset. That assigns nothing
    // and mints no session, but still runs the orphan-cookie sweep in assignExperiments —
    // so a visitor who was mid-experiment gets their stale `x-ab-*` cookies expired and

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