Introduction

While working with OpenShift Routes recently, I came across a problem with an application deployment that was not working. OpenShift was returning an “Application is not Available” page, even though the application pod was up, and the service was properly configured and mapped. After some additional troubleshooting, we were able to trace the problem back to how the OpenShift router communicates with an application pod. Depending on your route type, OpenShift will either use HTTP, HTTPS or passthrough TCP to communicate with your application. By better understanding the traffic flow and the protocol used, we were able to quickly resolve the issue and get the application up and running. So with this in mind, I figured it would make sense to share this experience so others could benefit from this experience.