prettified and added max-age=0

flight/net/Response.php

@@ -288,7 +288,7 @@ class Response
     {
         if ($expires === false) {
             $this->headers['Expires'] = 'Mon, 26 Jul 1997 05:00:00 GMT';
-            $this->headers['Cache-Control'] = 'no-store, no-cache, must-revalidate';
+            $this->headers['Cache-Control'] = 'no-store, no-cache, must-revalidate, max-age=0';
             $this->headers['Pragma'] = 'no-cache';
         } else {
             $expires = \is_int($expires) ? $expires : strtotime($expires);
@@ -432,7 +432,6 @@ class Response
         }
 
         if ($this->headersSent() === false) {
-
             // If you haven't set a Cache-Control header, we'll assume you don't want caching
             if ($this->getHeader('Cache-Control') === null) {
                 $this->cache(false);

tests/FlightTest.php

@@ -361,8 +361,7 @@ class FlightTest extends TestCase
         string $output,
         array $renderParams,
         string $regexp
-    ): void
+    ): void {
-    {
         Flight::view()->preserveVars = false;
 
         $this->expectOutputString($output);

tests/ResponseTest.php

@@ -164,7 +164,7 @@ class ResponseTest extends TestCase
         $response->cache(false);
         $this->assertEquals([
             'Expires' => 'Mon, 26 Jul 1997 05:00:00 GMT',
-            'Cache-Control' => 'no-store, no-cache, must-revalidate',
+            'Cache-Control' => 'no-store, no-cache, must-revalidate, max-age=0',
             'Pragma' => 'no-cache'
         ], $response->headers());
     }
@@ -269,7 +269,7 @@ class ResponseTest extends TestCase
             'Content-Type: text/html',
             'X-Test: test',
             'Expires: Mon, 26 Jul 1997 05:00:00 GMT',
-            'Cache-Control: no-store, no-cache, must-revalidate',
+            'Cache-Control: no-store, no-cache, must-revalidate, max-age=0',
             'Pragma: no-cache',
             'Content-Length: 9'
         ], $sent_headers);