XMLHttpRequest on the main thread is deprecated

Question

What meaning of this message:

Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check http://xhr.spec.whatwg.org/.

You may have a new message that will block any feature of my site?

Thanks

Read this: https://xhr.spec.whatwg.org/#sync-warning – Blago Eres Aug 07 '15 at 02:48 — Blago Eres, Aug 07 '15 at 02:48

score 0 · Answer 1 · edited May 23 '17 at 12:30

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Apparently this message is displayed when using a synchronous AJAX request. Synchronous XMLHttpRequest on the main thread is deprecated

edited May 23 '17 at 12:30

Community

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answered Aug 07 '15 at 02:40

MuriloDAG

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score 0 · Answer 2 · answered Aug 07 '15 at 02:43

If you use a synchronous ajax request on the main thread it will block your application / webpage until the response is received.

You should use asynchronous requests with callbacks or use Worker-Threads to load the data with XMLHttpRequest. Normally the first solution is the prefered way.

XMLHttpRequest on the main thread is deprecated

2 Answers2