.nowignore

main.go

main.go

package main
  
import (
        "log"
        "net/http"
)

func main() {
        http.HandleFunc("/", Handler)
        log.Fatal(http.ListenAndServe(":8000", nil))
}

now.go

package main

import (
        "io"
        "log"
        "net/http"
)

func Handler(w http.ResponseWriter, _ *http.Request) {
        response, err := http.Get("https://upload.wikimedia.org/wikipedia/commons/6/6b/Leuchtkäfer_-_Firefly.JPG")
        if checkErr(err) { return }
        w.Header().Set("Content-Type", "image/jpeg")
        _, err = io.Copy(w, response.Body)
        if checkErr(err) { return }
}

func checkErr(err error) bool {
        if err != nil {
                log.Println(err)
                return true
        }
        return false
}

now.json

{
    "version": 2,
    "name": "binary-resp",
    "builds": [
        { "src": "now.go", "use": "@now/go" }
    ],
    "routes": [
        { "src": "/.*", "dest": "now.go" }
    ]
}