Как загрузить файл/zip архив на сервер средствами golang?

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package main

import (
    "bytes"
    "io"
    "mime/multipart"
    "net/http"
    "os"
)

func main() {
    url := "http://localhost:8080/upload"
    filename := "example.zip"

    bodyBuf := &bytes.Buffer{}
    bodyWriter := multipart.NewWriter(bodyBuf)

    fileWriter, err := bodyWriter.CreateFormFile("uploadfile", filename)
    if err != nil {
        panic(err)
    }

    fh, err := os.Open(filename)
    if err != nil {
        panic(err)
    }
    defer fh.Close()

    _, err = io.Copy(fileWriter, fh)
    if err != nil {
        panic(err)
    }

    contentType := bodyWriter.FormDataContentType()
    bodyWriter.Close()

    resp, err := http.Post(url, contentType, bodyBuf)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()
}