How to write a web api replies very slowly with an infinite stream of text using java?

Question

I want to write a web api that returns same text every 5 seconds in an infinite stream using java. What are the possible ways? and how to do it?

example:

curl 'https://localhost:8080/abcd'

response as below :

"some text"
.
.<wait 5 seconds>
.
"some text"
.
.<wait 5 seconds>
.
"some text"
.
.
etc...

Answer 1

Using Spring Webflux

Option #1

@GetMapping("")   
public Flux<ServerSentEvent<String>> getStreamEvents() {
            return Flux.interval(Duration.ofSeconds(5))
                    .map(sequence -> ServerSentEvent.<String>builder()
                            .id(String.valueOf(sequence))
                            .event("periodic-event")
                            .data("something...")
                            .build());
     }

Option #2

@GetMapping(path = "/", produces = MediaType.TEXT_EVENT_STREAM_VALUE)
public Flux<String> streamFlux() {
    return Flux.interval(Duration.ofSeconds(1))
      .map(sequence -> "Flux - " + LocalTime.now().toString());
}