### Relevant Articles: 

- [A Guide to OkHttp](https://www.baeldung.com/guide-to-okhttp)
- [A Guide to Google-Http-Client](https://www.baeldung.com/google-http-client)
- [Asynchronous HTTP with async-http-client in Java](https://www.baeldung.com/async-http-client)
- [WebSockets with AsyncHttpClient](https://www.baeldung.com/async-http-client-websockets)
- [Integrating Retrofit with RxJava](https://www.baeldung.com/retrofit-rxjava)
- [Introduction to Retrofit](https://www.baeldung.com/retrofit)
- [A Guide to Unirest](https://www.baeldung.com/unirest)
- [Creating REST Microservices with Javalin](https://www.baeldung.com/javalin-rest-microservices)