The most complex achievement of Ultraviolet is its ability to rewrite JavaScript and Document Object Model (DOM) properties on the fly. Modern websites frequently use absolute paths or verify their own origin URLs for security and functionality. If a script looks for example.com but finds itself running on my-proxy-server.com , it will often crash.
[ User Browser ] ---> [ Service Worker Interception ] ---> [ URL & Script Rewriter ] ---> [ Proxy Backend ] ---> [ Target Website ]
The sophistication of Ultraviolet lies in its underlying architecture, which moves away from server-side string replacement and shifts the heavy lifting to the client-side browser engine. Service Worker Interception