ENGCOM-8107: Update Curl to respect case-insensitive headers #29274

 - Merge Pull Request #29274 from pmzandbergen/magento2:patch-1
 - Merged commits:
   1. 44d88e6
   2. ba6513f
   3. 730c495
   4. 552e0c1
   5. b5463b8
   6. e43e45f
   7. e1d21cd
   8. 9570f8f
   9. 9db1f83
   10. d61e030
   11. e912bdf
   12. d5c674d

Author: magento-engcom-team

lib/internal/Magento/Framework/HTTP/Client/Curl.php

@@ -453,11 +453,8 @@ protected function parseHeaders($ch, $data)
             }
 
             if (strlen($name)) {
-                if ("Set-Cookie" == $name) {
-                    if (!isset($this->_responseHeaders[$name])) {
-                        $this->_responseHeaders[$name] = [];
-                    }
-                    $this->_responseHeaders[$name][] = $value;
+                if ('set-cookie' === strtolower($name)) {
+                    $this->_responseHeaders['Set-Cookie'][] = $value;
                 } else {
                     $this->_responseHeaders[$name] = $value;
                 }

lib/internal/Magento/Framework/HTTP/Test/Unit/Client/CurlTest.php

@@ -26,4 +26,57 @@ public function testInvalidProtocol()
         $client = new Curl();
         $client->get('telnet://127.0.0.1/test');
     }
+
+    /**
+     * Check the HTTP client ability to parse headers case-insensitive.
+     */
+    public function testParseHeaders()
+    {
+        // Prepare protected parseHeaders method
+        $curl = new Curl();
+        $parseHeaders = new \ReflectionMethod(
+            $curl,
+            'parseHeaders'
+        );
+        $parseHeaders->setAccessible(true);
+
+        // Parse headers
+        foreach ($this->headersDataProvider() as $header) {
+            $parseHeaders->invoke($curl, null, $header);
+        }
+
+        // Validate headers
+        $headers = $curl->getHeaders();
+        $this->assertIsArray($headers);
+        $this->assertEquals([
+            'Content-Type' => 'text/html; charset=utf-8',
+            'Set-Cookie' => [
+                'Normal=OK',
+                'Uppercase=OK',
+                'Lowercase=OK',
+            ]
+        ], $headers);
+
+        // Validate status
+        $status = $curl->getStatus();
+        $this->assertIsInt($status);
+        $this->assertEquals(200, $status);
+
+        // Validate cookies
+        $cookies = $curl->getCookies();
+        $this->assertIsArray($cookies);
+        $this->assertEquals([
+            'Normal' => 'OK',
+            'Uppercase' => 'OK',
+            'Lowercase' => 'OK',
+        ], $cookies);
+    }
+
+    /**
+     * @return array
+     */
+    public function headersDataProvider()
+    {
+        return array_filter(explode(PHP_EOL, file_get_contents(__DIR__ . '/_files/curl_headers.txt')));
+    }
 }

lib/internal/Magento/Framework/HTTP/Test/Unit/Client/_files/curl_headers.txt

@@ -0,0 +1,5 @@
+Status: 200 OK
+Content-Type: text/html; charset=utf-8
+Set-Cookie: Normal=OK
+SET-COOKIE: Uppercase=OK
+set-cookie: Lowercase=OK