In this book, in the various code examples, we didn't use a library specifically for OAuth 2.0, but instead used the Spring framework MVC controllers to map endpoints and extract the parameters, the Apache HTTP client to make requests to the authorization servers, and the GSON library to parse the JSON files retuned by them.
This way, we implemented the various OAuth 2.0 grant flows by ourselves, and by doing that we showed what is going on under the hood. By implementing the various OAuth 2.0 grant flows by ourselves, we are able to modify the code in the client application faster and more easily, if the flow is not 100 percent by specification but has some customization to it.
Nevertheless, there are numerous libraries for various popular ...
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