Solution for question "Reading image from HTTP request's body in Go" at SO

so-cutter.go

package main

import (
  "fmt"
  "http"
  "io"
)

var client = http.Client{}

func cutterHandler(res http.ResponseWriter, req *http.Request) {
  reqImg, err := client.Get("http://www.google.com/intl/en_com/images/srpr/logo3w.png")
  if err != nil {
    fmt.Fprintf(res, "Error %d", err)
    return
  }
  buffer := make([]byte, reqImg.ContentLength)
  io.ReadFull(reqImg.Body, buffer)
  res.Header().Set("Content-Length", fmt.Sprint(reqImg.ContentLength))
  res.Header().Set("Content-Type", reqImg.Header.Get("Content-Type"))
  res.Write(buffer)
  req.Body.Close()
}

func main() {
  http.HandleFunc("/cut", cutterHandler)
  http.ListenAndServe(":8080", nil) /* TODO Configurable */
}