From 14c935bafc2b4092e9107ea291afb44c2f46ddb6 Mon Sep 17 00:00:00 2001
From: George Fu <kuhe@users.noreply.github.com>
Date: Tue, 1 Oct 2024 20:57:22 +0000
Subject: [PATCH] additional test cases for split-header

---
 packages/smithy-client/src/split-header.spec.ts | 4 ++++
 packages/smithy-client/src/split-header.ts      | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/packages/smithy-client/src/split-header.spec.ts b/packages/smithy-client/src/split-header.spec.ts
index fd6933fc5fc..f13cf54169a 100644
--- a/packages/smithy-client/src/split-header.spec.ts
+++ b/packages/smithy-client/src/split-header.spec.ts
@@ -11,5 +11,9 @@ describe(splitHeader.name, () => {
   it("should split a string by commas that are not in quotes, and remove outer quotes", () => {
     expect(splitHeader('"b,c", "\\"def\\"", a')).toEqual(["b,c", '"def"', "a"]);
     expect(splitHeader('"a,b,c", ""def"", "a,b ,c"')).toEqual(["a,b,c", '"def"', "a,b ,c"]);
+    expect(splitHeader(`""`)).toEqual([``]);
+    expect(splitHeader(``)).toEqual([``]);
+    expect(splitHeader(`\\"`)).toEqual([`"`]);
+    expect(splitHeader(`"`)).toEqual([`"`]);
   });
 });
diff --git a/packages/smithy-client/src/split-header.ts b/packages/smithy-client/src/split-header.ts
index da61b573b59..e76aa577de6 100644
--- a/packages/smithy-client/src/split-header.ts
+++ b/packages/smithy-client/src/split-header.ts
@@ -34,6 +34,9 @@ export const splitHeader = (value: string): string[] => {
   return values.map((v) => {
     v = v.trim();
     const z = v.length;
+    if (z < 2) {
+      return v;
+    }
     if (v[0] === `"` && v[z - 1] === `"`) {
       v = v.slice(1, z - 1);
     }