This indicates an attempt to access Psiphon.
Psiphon is a censorship circumvention tool from Psiphon Inc. It uses various communication and encrypted protocols like VPN, SSH, SSL, HTTP Proxy to tunnel the traffic through a firewall. It is designed to support users with heavy censorship in their country. The concept was developed by Citizen Lab. It is one of the most popular proxy app today. Psiphon periodically releases updates to get around new firewall signatures written for previous versions.