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package main

import (
	"encoding/json"
	"net/http"
	"time"

	"github.com/labstack/echo/v4"
)

type (
	Geolocation struct {
		Altitude  float64
		Latitude  float64
		Longitude float64
	}
)

var (
	locations = []Geolocation{
		{-97, 37.819929, -122.478255},
		{1899, 39.096849, -120.032351},
		{2619, 37.865101, -119.538329},
		{42, 33.812092, -117.918974},
		{15, 37.77493, -122.419416},
	}
)

func main() {
	e := echo.New()
	e.GET("/", func(c echo.Context) error {
		c.Response().Header().Set(echo.HeaderContentType, echo.MIMEApplicationJSON)
		c.Response().WriteHeader(http.StatusOK)

		enc := json.NewEncoder(c.Response())
		for _, l := range locations {
			if err := enc.Encode(l); err != nil {
				return err
			}
			c.Response().Flush()
			time.Sleep(1 * time.Second)
		}
		return nil
	})
	e.Logger.Fatal(e.Start(":1323"))
}

1

$ curl localhost:1323

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{"Altitude":-97,"Latitude":37.819929,"Longitude":-122.478255}
{"Altitude":1899,"Latitude":39.096849,"Longitude":-120.032351}
{"Altitude":2619,"Latitude":37.865101,"Longitude":-119.538329}
{"Altitude":42,"Latitude":33.812092,"Longitude":-117.918974}
{"Altitude":15,"Latitude":37.77493,"Longitude":-122.419416}