The blog post provides a tutorial on building a web application for Google App Engine using the PubNub Go Programming Language SDK, focusing on real-time Pub/Sub messaging capabilities. It guides users through the process of subscribing to and publishing messages on a PubNub channel, using both the PubNub Golang SDK and the PubNub JavaScript SDK. The tutorial includes prerequisites such as installing the Eclipse IDE, Google App Engine SDK for Go, and the Golang plugin for Eclipse, alongside cloning the PubNub Go SDK library. Users are instructed to configure and run the application on a local development server, enabling bidirectional data communication between devices. The tutorial also details the necessary setup for using encryption, SSL, and custom UUIDs, and provides links to the complete code and additional resources for further exploration.