Getting net ERR BLOCKED BY CLIENT error on some AJAX calls

Question

Recently I ve realised that  some adblocker extensions  such as adBlocker plus  block some Ajax calls  I get that error on the console   GET http   localhost prj conn php q users list  net  ERR BLOCKED BY CLIENT    Why does it block some Ajax call but not the others and what causes that  Is there any workaround other than telling user to turn off adblocker

User · Answer

In my case it was a Chrome extension and Firefox add-on by Avira called  Avira Browser Safety   I had problems with version 1 7 4  In my specific case I wanted to login to a website called gliffy com for making diagrams  but after logging in I got an blank page  If you use F12  console  in Chrome you can see all these ERR BLOCKED BY CLIENT  and other  errors

User · Answer

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

User · Answer

If your URL contains words such as  advert    ad    doubleclick    click   or something similar     For example    GET googleads g doubleclick net pagead id static doubleclick net instream ad status js      Then ad-blocker will block it

User · Answer

I ve discovered that if the filename has 300 in it  AdBlock blocks the page and throws a ERR BLOCKED BY CLIENT error

User · Answer

As it has been explained here  beside of multiple extensions that perform ad or script blocking you may aware that this may happen by file names as below   Particularly in the AdBlock Plus the character string  quot -300x600 quot  is causing the Failed to Load Resource ERR BLOCKED BY CLIENT problem   As shown in the picture  some of the images were blocked because of the  -300x600  pattern in their name  that particular text pattern matches an expression list pattern in the AdBlock Plus

User · Answer

Opera Blocker and others check all files urls in Network  Then compares to the list  It is EasyPrivacy and EasyList  If your file url in this  your will be ban  Good luck   So    I find FilterLists for all addBlockers

User · Answer

Add  PrivacyBadger to the list of potential causes

User · Answer

I find a case is if your url contains the key word banner  it will blocked too

[ajax] Getting "net::ERR_BLOCKED_BY_CLIENT" error on some AJAX calls

Examples related to ajax

Examples related to google-chrome-extension

Examples related to firefox-addon