Delve into creating REST APIs with Spring Framework, integrating databases with JPA, implementing Aspect-Oriented Programming, unit testing, and documenting with Springfox, and monitoring with Spring Boot Actuator.

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In this advanced-level course, you’ll learn to create REST APIs using the Spring Framework. The course gives a detailed experience in designing, implementing, and documenting REST APIs with end-to-end features like database integration and monitoring.

Firstly, you'll set up a Spring Boot project and create fully-functional REST APIs to manage your to-do lists. Secondly, you’ll learn database integration using Spring Data JPA and consume APIs using various tools such as cURL, Postman, and the Swagger UI. Thirdly, you'll learn Aspect-Oriented Programming (AOP) in Spring and Unit test the APIs using Spring Framework. Lastly, you’ll learn to document APIs using Springfox and Spring REST Docs and monitor them using the Spring Boot Actuator. 

By the end of this course, you'll be confident to design, implement, and document REST APIs end-to-end using the Spring Framework, including advanced topics like AOP, Unit Testing, and Monitoring.

REST APIs with Spring, JPA, and Springfox

An #key# **ETag** : Entity-Tag #key# is an HTTP response header to determine a specific version of a resource. It allows a web server to not send a complete response if the content has not changed. Therefore, an ETag improves web caching and saves bandwidth usage.

The quickest way to add ETag support in our REST APIs is by using the `ShallowEtagHeaderFilter` class. This filter class generates an ETag value based on the response content and adds it to the response header of each request.

So, let's create the `WebConfig` class and add a filter bean of the `ShallowEtagHeaderFilter` instance. Also, we'll mark the `WebConfig` class with the `@Configuration` annotation for Spring to pick the configuration changes.

Let’s learn about the ETags and their usage in Spring Data Rest.

Introduction to Spring Boot

Develop REST APIs

Database Integration With Spring Data JPA

REST APIs With Spring Data REST

Aspect Oriented Programming

Spring Framework Testing

Consuming APIs

API Documentation With Swagger

API Documentation Using Spring REST Docs

Spring Boot Actuator

Wrapping Up

ETags for REST APIs

What is an ETag?