$.ajax ignoring data param for DELETE requests

Question

I just updated from jQuery 1.3.2 to 1.4.3, and I'm seeing some new behavior when making AJAX DELETE requests. For some reason, the data being passed in my data parameter is not being sent to the server. For example:

$.ajax({
    url: '/example',
    data: {id: 12},
    type: 'DELETE'
});

Ends up sending a DELETE request to /example with no additional data. However, this type of call passes the parameters just fine:

$.ajax({
    url: '/example?id=12',
    type: 'DELETE'
});

Has anyone else seen similar behavior? Is there a reason this is no longer working (i.e.: is it by design, or is it a bug)? Any suggestions on how to get it working?

Also, in case anyone is wondering why I don't simply want to pass the parameters as part of the URL string, it's because I'm ultimately attempting to use the $.ajaxSetup callback, providing some general parameters there (namely the authenticity_token parameter used to protect against forgery in Rails). This all worked fine prior to trying jQuery 1.4.3.

Answer 1

Could this be related to the traditional parameter? It usually relates to complex types and not a simple id parameter but worth checking if this is not the case:

$.ajax({
    url: '/example',
    data: { id: someValue },
    traditional: true,
    type: 'DELETE'
});

Answer 2

jQuery will only append parameters to the querystring for GET requests only (and no body for DELETE requests), so this is intentional behavior in jQuery 1.4.3.

However, there is a change since then (commit here) to allow a body for DELETE requests in the 1.4.4 release.