go get github.com/anargu/gin-brotli

package main

import (
    "fmt"
    "time"
    "net/http"

    brotli "github.com/anargu/gin-brotli"
    "github.com/gin-gonic/gin"
)

func main() {
    r := gin.Default()
    r.Use(brotli.Brotli(brotli.DefaultCompression))
    r.GET("/hello", func(c *gin.Context) {
        c.String(http.StatusOK, fmt.Sprintf("World at %s", time.Now()))
    })

    // Listen and Server in 0.0.0.0:8080
    r.Run(":8080")
}

cd example/

go run example.go

curl -X GET http://localhost:8080/json