单向跨域请求

I has to request to other domains in my app. There are two different situations. One is request data from remote site requestData.action, the other is post data to remote site( this doesn't need data returned) feedBack.action.

For the first one, I asked the remote server to modify their code to add a field callback and I use jQuery.getJSON to solve this problem.

Now questions is: Has feedBack.action to be modified? If not, is my Ajax requestion can be recieved by the server?

For example, if I listened for the user's behavior, and the user clicked a url, I send a feedback msg to feedBack.action by:

$.get(domain+"feedBack.action",{userId:id, time:curTime})//no callback function