HTTP server to echo back your HTTP request body in Base64. Useful for writing AWS Lambda tests.

echo2b64.go

package main

import (
	"encoding/base64"
	"io"
	"net/http"
	"os"
)

type EchoReader struct {
	io.Reader
}

func (e EchoReader) Read(p []byte) (n int, err error) {
	n, err = e.Reader.Read(p)
	os.Stdout.Write(p)
	return
}

func main() {
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
		reader := EchoReader{r.Body}
		encoder := base64.NewEncoder(base64.RawStdEncoding, w)
		io.Copy(encoder, reader)
	})
	http.ListenAndServe("0.0.0.0:5454", nil)
}