// correct example

$J.ajax({

type: "POST",

url : "challenge/delete.js",

data: "", forced to explicitly set empty string value to prevent server side HTTPStatus::LengthRequired

dataType: "script"

});

error example: lead to error HTTPStatus::LengthRequired in Webrick. Mongrel had exception. Not tested on Apache.

$J.ajax({

type: "POST",

url : "challenge/delete.js",

dataType: "script"

});