We have an app that uses SignalR to talk to scanner drivers locally that has been in production for a couple of years working on IE, Chrome and Firefox, which do not have a prob
you can try this.
$.ajax({ url:url, type:"POST", data:data, contentType:"application/json; charset=utf-8", dataType:"json", success: function(){ // } });
and make sure to properly provide the parameters, content-type, data-type, responseCode..etc