compare pywikidiff2 to making requests to wikidiff2.

wikidiff2_api.php

@@ -1,5 +1,9 @@
 <?php
 
+header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0");
+header("Cache-Control: post-check=0, pre-check=0", false);
+header("Pragma: no-cache");
+
 // Launch this server with:
 // php -S localhost:8000 -q -c php.ini