Open the link, and see the meaning of 200 and 201 codes
Put 2 // and comment out your header command (so it won’t be executed). And in the Kodular blocks, check Response Code.
The header string.
There are two special-case header calls. The first is a header that starts with the string "HTTP/" (case is not significant), which will be used to figure out the HTTP status code to send. For example, if you have configured Apache to use a PHP script to handle requests for missing files (using the ErrorDocument directive), you may want to make sure that your script generates the proper status code.