Synchronous XMLHttpRequest in the main thread is an obsolete error

Question

For some reason, I get the following error in an Angularjs application:

The synchronous XMLHttpRequest in the main thread is deprecated due to its harmful effects on the end user.

As I have no idea what causes it, I don’t know which code to share? The problem occurs when I switch to the state (ui-router), but there is no controller associated with this state.

Has anyone seen this before?

Answer 1

This is caused by an attempt to make a synchronous AJAX call from a browser.

If an Ajax call is made through jQuery, it occurs when using:

async: false

as an argument for any of jQuery ajax calls.

native XMLHttpRequest, , :

xmlhttp.open(...)

false.

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Answer 2

Synchronous XMLHttpRequest on the main thread is deprecated , .

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