removed cache breaking behavior

flight/net/Response.php

@@ -432,11 +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);
-            }
-
             $this->sendHeaders();
         }
 

tests/ResponseTest.php

@@ -268,9 +268,6 @@ class ResponseTest extends TestCase
             'HTTP/1.1 200 OK',
             'Content-Type: text/html',
             'X-Test: test',
-            'Expires: Mon, 26 Jul 1997 05:00:00 GMT',
-            'Cache-Control: no-store, no-cache, must-revalidate, max-age=0',
-            'Pragma: no-cache',
             'Content-Length: 9'
         ], $sent_headers);
     }