Update auth header injection in request options

Refactor authorization header handling for HTTP requests.

multi-provider-key-rotator.cjs

@@ -334,13 +334,17 @@ function patchHttpModule(mod) {
               ? { ...options, path: `${u.pathname}${u.search}` }
               : u.toString();
           } else if (typeof options === 'string' || options instanceof URL) {
+            // Convert string/URL to options object and inject auth header.
+            // Also preserve any extra options passed as args[1] (3-arg form of http.request).
             const u = new URL(String(options));
+            const extraOpts = (args[1] && typeof args[1] === 'object' && typeof args[1].on !== 'function') ? args[1] : {};
             args[0] = {
               protocol: u.protocol,
               hostname: u.hostname,
               port:     u.port,
               path:     `${u.pathname}${u.search}`,
-              headers:  { authorization: `Bearer ${key}` },
+              ...extraOpts,
+              headers:  setAuthHeader(extraOpts.headers, key),
             };
           } else if (options && typeof options === 'object') {
             args[0] = { ...options, headers: setAuthHeader(options.headers, key) };