Simple logging HTTP proxy in Go

main.go

package main

import (
	"fmt"
	"github.com/elazarl/goproxy"
	"github.com/vrischmann/termcolor"
	"log"
	"net/http"
)

func main() {
	proxy := goproxy.NewProxyHttpServer()
	proxy.OnResponse().DoFunc(func(r *http.Response, ctx *goproxy.ProxyCtx) *http.Response {
		status := fmt.Sprintf("[%d]", r.StatusCode)
		var coloredStatusCode string
		switch r.StatusCode {
		case 301, 302:
			coloredStatusCode = termcolor.Colored(status, termcolor.Grey, termcolor.Bold)
		case 200:
			coloredStatusCode = termcolor.Colored(status, termcolor.Cyan)
		case 404, 500:
			coloredStatusCode = termcolor.Colored(status, termcolor.Red)
		default:
			coloredStatusCode = termcolor.Colored(status, termcolor.Magenta)
		}
		fmt.Printf("%s %s %v\n", coloredStatusCode, termcolor.Colored(ctx.Req.Method, termcolor.White, termcolor.Bold), ctx.Req.URL)
		return r
	})
	log.Fatal(http.ListenAndServe(":8080", proxy))
}