Google Chrome search is not blocked by policy in transparent deployment
Article ID: 168626
ProxySG Software - SGOS
Policy is configured to block access to the entire Google domain. When an internal user tries to search using Microsoft Internet Explorer or Mozilla Firefox, the search is blocked, but when the user types a search string in the address bar in Google Chrome, the browser displays search results.
QUIC (Quick UDP Internet Connections, pronounced "quick") is an experimental transport layer network protocol developed by Google that supports a set of multiplexed connections between two endpoints over User Datagram Protocol (UDP).
When a search string is provided in the browser address bar, Chrome tries to send the request through UDP. The client side/proxy side PCAP shows UDP traffic and lines such as the following: