How to fix it #2: How to resolve issues with KClient JS

KClient JS is one of the Keitaro integrations methods which connects third-party websites with a JS code and dynamically changes the content without a visible redirect. This integration type is very popular while working with website builders (Tilda, Taplink, Shopify, etc.) where adding PHP is not allowed but there are modules for HTML/JS import.
We will describe the most common issues and their solutions while working with KClient JS.