This is the source code listing for the Manning Publications book HTTP/2 in Action.
There is not a huge amount of code here I'll be honest, and it's not the most complicated. This is because the book is not a traditional programming book aimed at teaching you a programming language, but is instead about a protocol, and aims to teach you concepts rather than code. However to save you typing out the examples I've placed the few small pieces of code I do have online here.
For feedback, feel free to raise an issue or comment on the book's forum.