Vercel + Gin

package main

import (
    "net/http"
    "os"

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

func main() {
    r := gin.Default()

    r.GET("/", func(c *gin.Context) {
        c.JSON(http.StatusOK, gin.H{
            "message": "Go on Vercel!",
        })
    })

    port := os.Getenv("PORT")
    r.Run(":" + port)
}