Question

What’s the best way to go about receiving binary data via HTTP in go? In my case, I’d like to send a zip file to my application’s REST API. Examples specific to goweb would be great, but net/http is fine too.

Answer 1

Just read it from the request body

Something like

package main

import ("fmt";"net/http";"io/ioutil";"log")

func h(w http.ResponseWriter, req *http.Request) {
    buf, err := ioutil.ReadAll(req.Body)
    if err!=nil {log.Fatal("request",err)}
    fmt.Println(buf) // do whatever you want with the binary file buf
}

A more reasonable approach is to copy the file into some stream

defer req.Body.Close()
f, err := ioutil.TempFile("", "my_app_prefix")
if err!=nil {log.Fatal("cannot open temp file", err)}
defer f.Close()
io.Copy(f, req.Body)