ex-servlet.md

Servlet 4 and HTTP/2 Support Exercise

Introduction

The main feature of the Servlet 4.0 API is to provide HTTP/2 support. In this exercise, we will see what it takes to HTTP/2 enable the simple Web application that we have developed in the previous exercise.

Check the URL of the application, it connects in clear (i.e. using http) to the port 8080. Now adjust the url to use https instead of http and to connect to port 8181 instead of port 8080 and connect to that updated URL.

Chrome will complain by saying that "Your connection is not private"; click on ADVANCED and then on Procceed to locahost (unsafe).

⚠️ Chrome complains because GlassFish is using, by default, a self-signed certificate. So while the connection between the browser and GlassFish is encrypted (TLS), it can't be trusted. In your application, you should use a certifacate that you can get from a trusted Certificate Authority. For the sake of this exercise, we can ignore this warning.

Login as ed/ED, you should see the main page of the application and a small blue lightning at the top right corner. This is Chrome HTTP/2 indicator; blue means that the connection is server over HTTP/2. Clicking on it will show details on the HTTP/2 connection (streams, frames, etc.). This is really all it takes to HTTP/2 enable an exisiting Servlet application, just deploy on a Servlet 4 container!

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