diff --git a/lib/core/util.js b/lib/core/util.js
index dfefac6d15c..13fa4e8fdf4 100644
--- a/lib/core/util.js
+++ b/lib/core/util.js
@@ -241,7 +241,7 @@ function parseURL (url) {
 function parseOrigin (url) {
   url = parseURL(url)
 
-  if (url.pathname !== '/' || url.search || url.hash) {
+  if (url.search || url.hash) {
     throw new InvalidArgumentError('invalid url')
   }
 
diff --git a/test/issue-3999.js b/test/issue-3999.js
new file mode 100644
index 00000000000..c4552a13417
--- /dev/null
+++ b/test/issue-3999.js
@@ -0,0 +1,34 @@
+'use strict'
+
+const { test } = require('node:test')
+const assert = require('node:assert')
+const { parseOrigin } = require('../lib/core/util')
+
+// Test cases for parseOrigin functionality
+test('parseOrigin allows URLs with paths and rejects invalid ones', async (t) => {
+  // Valid URL with path
+  const validUrl = 'https://api.domain.com/elastic'
+  const result = parseOrigin(validUrl)
+  assert.strictEqual(result.href, validUrl, 'Should return the input URL with the path for valid cases')
+
+  // Invalid URL with query string
+  const invalidQueryUrl = 'https://api.domain.com/elastic?query=test'
+  assert.throws(
+    () => parseOrigin(invalidQueryUrl),
+    /InvalidArgumentError/,
+    'Should throw InvalidArgumentError for URLs with query strings'
+  )
+
+  // Invalid URL with fragment
+  const invalidFragmentUrl = 'https://api.domain.com/elastic#section'
+  assert.throws(
+    () => parseOrigin(invalidFragmentUrl),
+    /InvalidArgumentError/,
+    'Should throw InvalidArgumentError for URLs with fragments'
+  )
+
+  // Valid URL without path
+  const validSimpleUrl = 'https://api.domain.com'
+  const simpleResult = parseOrigin(validSimpleUrl)
+  assert.strictEqual(simpleResult.href, `${validSimpleUrl}/`, 'Should return the input URL with the trailing slash')
+})