Suppose you are in the backend code of your Spring Boot application and you want to access some other API, e.g. the https://developer.ucsb.edu API.

What code can you use?

Here is a tutorial on the REST client built into Spring Boot called RestTemplate:

• https://howtodoinjava.com/spring-boot2/resttemplate/spring-restful-client-resttemplate-example/
• https://www.baeldung.com/rest-template
• https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/web/client/RestTemplate.html

This one covers the Maven dependencies that need to be in the pom.xml

• https://www.baeldung.com/how-to-use-resttemplate-with-basic-authentication-in-spring

Setting Headers

Many APIs (including, for example, https://developer.ucsb.edu) require setting headers.

For example, https://developer.ucsb.edu requires you to set:

accept: application/json
ucsb-api-version: 1.0
ucsb-api-key: value-specific-to-each-api-user

How do you set these headers? This article explains:

• https://stackoverflow.com/questions/32623407/add-my-custom-http-header-to-spring-resttemplate-request-extend-resttemplate/32623548