Accept list of HTTP Status codes for content-on-error
One may not always want to store the content from all HTTP errors to disk.
Sometimes, the webpage may actually deliver useful information in the body of a non-error non-2xx status code. Bad servers exist far too often.
Hence, we should allow the user to save the response of any status code to disk. Accept a list of status of codes and make them work similar to the existing content-on-error