only caching GET requests for static files

closes #1

server.pl

@@ -212,7 +212,11 @@ my $enable_experimental_features = $ENV{'ENABLE_EXPERIMENTAL_FEATURES' } || 0;
       if (!serve_static($server, $cgi, $webroot)) {
         $cached = 0;
       }
-      $_staticcache->set($path, $cached);
+      # only save to cache on GET requests
+      # https://code.sitosis.com/rudism/dotplan-online/issues/1
+      if ($cgi->request_method() eq 'GET') {
+        $_staticcache->set($path, $cached);
+      }
     }
     print $cached if $cached;
     return $cached;