The :delete_empty_headers plugin deletes any headers whose value is set to the empty string.
Because of how default headers are set in Roda, if you have a default header but don't want
to set it for a specific request, you need to use this plugin and set the header value to the empty
string, and Roda will automatically delete the header.
#.finishDelete any empty headers when calling finish
#,def finish_with_body(_)Delete any empty headers when calling finish_with_body