From fb2624a215da24d9106fdee012bea79310ee5248 Mon Sep 17 00:00:00 2001
From: Jeffery <h3285@evertrust.com.tw>
Date: Tue, 23 Jun 2026 13:51:36 +0800
Subject: [PATCH] =?UTF-8?q?refactor(ai-review=20=E4=BD=BF=E7=94=A8?=
 =?UTF-8?q?=E9=87=8F):=20=E6=8A=BD=E5=87=BA=20lowerCaseKeys=20=E7=B0=A1?=
 =?UTF-8?q?=E5=8C=96=20header=20=E6=AD=A3=E8=A6=8F=E5=8C=96?=
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---
 app/usage.js | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/app/usage.js b/app/usage.js
index 0dab83a..5c24bba 100644
--- a/app/usage.js
+++ b/app/usage.js
@@ -83,6 +83,13 @@ export function resetRunUsage() {
 /** 最近一次回應的速率配額（rate limit）快照，用來計算「當前視窗剩餘百分比」。 */
 const rateLimit = { hasData: false, remaining: null, limit: null, kind: null };
 
+/** 將物件的 key 全部轉小寫，方便對大小寫不敏感的 HTTP header 取值。 */
+function lowerCaseKeys(obj) {
+  const out = {};
+  for (const k of Object.keys(obj)) out[k.toLowerCase()] = obj[k];
+  return out;
+}
+
 /**
  * 從回應 header 擷取速率配額剩餘量／上限。
  * 支援 OpenAI 相容（x-ratelimit-*-tokens）與 Anthropic（anthropic-ratelimit-tokens-*），
@@ -90,8 +97,7 @@ const rateLimit = { hasData: false, remaining: null, limit: null, kind: null };
  */
 export function recordRateLimit(headers) {
   if (!headers || typeof headers !== 'object') return;
-  const h = {};
-  for (const k of Object.keys(headers)) h[k.toLowerCase()] = headers[k];
+  const h = lowerCaseKeys(headers);
 
   let remaining = h['x-ratelimit-remaining-tokens'] ?? h['anthropic-ratelimit-tokens-remaining'];
   let limit = h['x-ratelimit-limit-tokens'] ?? h['anthropic-ratelimit-tokens-limit'];