From a312408b24cb4d51f0c4f1f5bf14ed56c608d8c4 Mon Sep 17 00:00:00 2001
From: Ayush7614 <ayushknj3@gmail.com>
Date: Wed, 2 Sep 2026 14:13:39 +0530
Subject: [PATCH] fix(helpers): make X-AIMock-Strict header parsing
 case-insensitive and whitespace-tolerant

Clients and proxies often normalize or user-configure header values
with varying case (True/TRUE) or surrounding whitespace. The previous
strict check compared literally against "true"/"false"/"1"/"0",
so "True" or " true " silently fell through to the server default,
causing surprising 404s/503s and reasoning suppression mismatches.

Trim and lower-case the value before comparison so "True", "TRUE",
" true " etc. are accepted. Unrecognised values still fall back to
the server default.
---
 src/helpers.ts | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/helpers.ts b/src/helpers.ts
index 748c475d..d9e36991 100644
--- a/src/helpers.ts
+++ b/src/helpers.ts
@@ -33,7 +33,8 @@ import type {
  * Header values override the server default — same precedence pattern as chaos
  * config headers (see resolveChaosConfig in chaos.ts).
  *
- * Header: `X-AIMock-Strict` — "true"/"1" → strict on, "false"/"0" → strict off.
+ * Header: `X-AIMock-Strict` — "true"/"1" → strict on, "false"/"0" → strict off
+ * (case-insensitive, surrounding whitespace trimmed).
  * When absent or unrecognised, falls back to the server-level default.
  */
 export function resolveStrictMode(
@@ -42,9 +43,13 @@ export function resolveStrictMode(
 ): boolean {
   if (rawHeaders) {
     const header = rawHeaders["x-aimock-strict"];
-    const val = typeof header === "string" ? header : Array.isArray(header) ? header[0] : undefined;
-    if (val === "true" || val === "1") return true;
-    if (val === "false" || val === "0") return false;
+    const rawVal =
+      typeof header === "string" ? header : Array.isArray(header) ? header[0] : undefined;
+    if (typeof rawVal === "string") {
+      const val = rawVal.trim().toLowerCase();
+      if (val === "true" || val === "1") return true;
+      if (val === "false" || val === "0") return false;
+    }
   }
   return serverDefault ?? false;
 }