ACP2E-3096: Incorrect curl headers making newrelic:create:deploy-marker not working

Author: bubasuma

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

@@ -190,10 +190,7 @@ public function write($method, $url, $http_ver = '1.1', $headers = [], $body = '
         }
 
         if (is_array($headers)) {
-            $curlHeaders = [];
-            foreach ($headers as $key => $value) {
-                $curlHeaders[] = $key . ': ' . $value;
-            }
+            $curlHeaders = $this->normalizeHeaders($headers);
             curl_setopt($this->_getResource(), CURLOPT_HTTPHEADER, $curlHeaders);
         }
 
@@ -348,4 +345,19 @@ private function extractCodeFromResponse(string $responseString)
 
         return false;
     }
+
+    /**
+     * Normalizes headers to cURL format
+     *
+     * @param array $headers Headers to normalize. Expected format: ['name' => 'value'] or ['name: value']
+     * @return array Normalized headers. Expected Format: ['name: value']
+     */
+    private function normalizeHeaders(array $headers): array
+    {
+        $curlHeaders = [];
+        foreach ($headers as $key => $value) {
+            $curlHeaders[] = !is_int($key) ? ($key . ': ' . $value) : $value;
+        }
+        return $curlHeaders;
+    }
 }