From f7e3e92058415278338d8eb15dc6f107da8dffd7 Mon Sep 17 00:00:00 2001
From: Jake Champion <jchampion@fastly.com>
Date: Tue, 18 Jul 2023 01:25:02 +0100
Subject: [PATCH] fix: Headers only accepts array which have nested array of
 length 2

fixes https://github.com/JakeChampion/fetch/issues/1235
---
 fetch.js     |  3 +++
 test/test.js | 10 ++++++++++
 2 files changed, 13 insertions(+)

diff --git a/fetch.js b/fetch.js
index c7775af..9c198c3 100644
--- a/fetch.js
+++ b/fetch.js
@@ -92,6 +92,9 @@ export function Headers(headers) {
     }, this)
   } else if (Array.isArray(headers)) {
     headers.forEach(function(header) {
+      if (header.length != 2) {
+        throw new TypeError('Headers constructor: expected name/value pair to be length 2, found' + header.length)
+      }
       this.append(header[0], header[1])
     }, this)
   } else if (headers) {
diff --git a/test/test.js b/test/test.js
index 8508610..e19a984 100644
--- a/test/test.js
+++ b/test/test.js
@@ -203,6 +203,16 @@ exercise.forEach(function(exerciseMode) {
 
         assert.equal(headers.get('Content-Type'), 'text/xml')
         assert.equal(headers.get('Breaking-Bad'), '<3')
+        assert.throws(function() {
+          new Headers([
+            ['Content-Type'],
+          ])
+        }, TypeError)
+        assert.throws(function() {
+          new Headers([
+            ['Content-Type', 'a', 'b'],
+          ])
+        }, TypeError)
       })
       test('headers are case insensitive', function() {
         var headers = new Headers({Accept: 'application/json'})
-- 
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