XHR request?
There is a setting in chrome that basically blocks the call I think its on by default, but used to be off. Its akin to a dying gasp.
The amount of power web developers are getting is scary, all sorts of features are been added to browsers seemingly on their whim so they have more ability to write abusive code. There is even the "native filesystem" api which is a security disaster waiting to happen.
XHR is getting quite popular I expect not only because its discrete in how requests are made but also because by default ublock doesnt block any XHR requests.