Spring Boot : Produces List :

https://stackoverflow.com/questions/41989832/creating-java-spring-boot-endpoint-to-obtain-list-of-objects-as-json

@RequestMapping(produces = MediaType.APPLICATION_JSON_VALUE, value = "/units")

CORS : How to handle CORS in Server code

@CrossOrigin(origins = "http://example.com")

https://medium.com/@dtkatz/3-ways-to-fix-the-cors-error-and-how-access-control-allow-origin-works-d97d55946d9

https://www.baeldung.com/spring-cors

1 2 3 4

@CrossOrigin(origins = "http://example.com", maxAge = 3600) @RestController @RequestMapping("/account") public class AccountController {

OpenAPI : Restful Documentation : HTML : SWAGGERHUB UI

https://app.swaggerhub.com/home

Create New -> Import and Document API

HTML Documentation

AWS ELB : Listener : Rules: Multiple Ports

AWS ELB when target (backend) applications runs on multiple ports of the same EC2

https://stackoverflow.com/questions/54915981/aws-elb-when-target-backend-applications-runs-on-multiple-ports-of-the-same-ec/54917808#54917808

https://docs.aws.amazon.com/elasticloadbalancing/latest/application/listener-update-rules.html

Multi Tabbed SSH Terminal : https://mobaxterm.mobatek.net/download-home-edition.html

https://mobaxterm.mobatek.net/download-home-edition.html

AWS : When to use Public IPs : AWS Reachability Troubleshooting

Always Remember

• If AppServer Application access is req., We will use LB/GW

• If Actual Server itself if req., We should use
• Private VPN Connection with that (1st priority)
• Public IP and Place it in - Public Subnet having Internet Gateway (2nd Priority)

AWS : Direct Connect

https://docs.aws.amazon.com/directconnect/latest/UserGuide/Welcome.html