Added licensing, redirected null /go requests to homepage, corrected 404 errors.

index.php

@@ -23,13 +23,18 @@
                     $result = $statement->get_result ( );
                     $row = $result->fetch_assoc ( );
                     if ( ! $row ) {
+                        http_response_code ( 404 );
                         include ( 'errors/404.html' );
+                        exit;
                     }
                     else {
                         include ( 'templates/redirect.html' );
                         echo ( '<script>var my_location = "' . $row [ 'URL' ] . '";</script>' );
                     }
                 }
+                else {
+                    header ( "Location: " . substr ( $_SERVER [ 'SCRIPT_NAME' ], 0, -10 ) );
+                }
                 break;
             case "login":
                 if ( isset ( $_SESSION [ 'user_id' ] ) ) {
@@ -113,7 +118,7 @@
                 break;
             default:
                 http_response_code ( 404 );
-                echo "fuck, 404!";
+                include ( 'errors/404.html' );
                 die ( );
         }
     }