The _
parameter is being set to a random string to avoid caching of the request. This the default behavior of a GET request for jQuery ajax requests. If you want to avoid it, set the cache
param to true.
$.ajax({
...
cache: true
...
});
http://api.jquery.com/jQuery.ajax
Update: It isn't the default behavor for non-script or jsonp requests, which means you likely are using $.ajaxSetup somewhere overriding the default.