I am Getting Failed to Load Resource: Net::Err_Blocked_By_Client with Google Chrome

Getting net::ERR_BLOCKED_BY_CLIENT error on some AJAX calls

AdBlockers usually have some rules, i.e. they match the URIs against some type of expression (sometimes they also match the DOM against expressions, not that this matters in this case).

Having rules and expressions that just operate on a tiny bit of text (the URI) is prone to create some false-positives...

Besides instructing your users to disable their extensions (at least on your site) you can also get the extension and test which of the rules/expressions blocked your stuff, provided the extension provides enough details about that. Once you identified the culprit, you can either try to avoid triggering the rule by using different URIs, report the rule as incorrect or overly-broad to the team that created it, or both.
Check the docs for a particular add-on on how to do that.

For example, AdBlock Plus has a Blockable items view that shows all blocked items on a page and the rules that triggered the block. And those items also including XHR requests.

Failed to load resource in chrome google.maps api

This type of errors are mostly due to an extension like Ad-block plus. Try disabling it for that website and that should fix that issue. You can also look at this question:
I am getting Failed to load resource: net::ERR_BLOCKED_BY_CLIENT with Google chrome

Is it possible to catch net::ERR_BLOCKED_BY_CLIENT?

Unfortunately you cannot catch that error message specifically, but you can catch the error itself:

$.ajax({
  url: 'http://openx.net',
  dataType: 'json',
  success: function( data ) {
    console.log( "Success:", data);
  },
  error: function( data ) {
    console.log( "Error:", data);
  }
});

Obviously the example isn't requesting JSON, but you can see that it fails and calls the error handler.

These errors are fired by Chrome when, for instance, a plugin like Adblock (as you mentioned) cancels a request.

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