Xmlhttprequest on the main thread is deprecated because of its detrimental effects to the end user’s Experience

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I use Signalr library, to send or receive notifications.

Follows code:

$(function () {    
    // Start hub
    $.connection.hub.start().done();  // <----Aqui faz ele aparecer no console
});

Log console:

Xmlhttprequest on the main thread is deprecated because of its detrimental effects to the end user’s Experience. For more help, check https://xhr.spec.whatwg.org/.

When I comment on the line:

//$.connection.hub.start().done();

The console warning disappears.

What is the cause of this warning and how to correct ?

OBS: jQuery version 3.1.1 and Signalr version 2.2.2, most updated version by nuget.

  • Can you create a jsFiddle that replicates that problem? I suggest you put it on Github as Issue. I don’t see what the problem could be if this library uses jQuery 3.

  • @Sergio, I really want to do this in jsFiddle, has part of the server side C# need to make it work signalR. How can I do ?

  • Can’t use jsFiddle echo? that simulates the server

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