Requesting multiple URLs in Go

I have the following Go program: https://play.golang.org/p/-TUtJ7DIhi

package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"net/http"
	"strconv"
)

func main() {
	body, err := get("https://hacker-news.firebaseio.com/v0/topstories.json")

	if err != nil {
		panic(err)
	}

	var ids [500]int
	if err = json.Unmarshal(body, &ids); err != nil {
		panic(err)
	}

	var contents []byte
	for _, value := range ids[0:10] {
		body, err := get("https://hacker-news.firebaseio.com/v0/item/" + strconv.Itoa(value) + ".json")

		if err != nil {
			fmt.Println(err)
		} else {
			contents = append(contents, body...)
		}
	}

	fmt.Println(contents)
}

func get(url string) ([]byte, error) {
	res, err := http.Get(url)
	if err != nil {
		return nil, err
	}

	body, err := ioutil.ReadAll(res.Body)
	res.Body.Close()

	return body, err
}

When run it throws EOF json errors on the iterative get requests, but when I hit the URLs individually they do not appear to be malformed.

What am I missing?

It looks like there's something wrong with their server, and it's closing connections without sending a Connection: close header. The client therefore tries to reuse the connection per the HTTP/1.1 specification.

You can work around this by creating your own request, and setting Close = true, or using a custom Transport with DisableKeepAlives = true

req, err := http.NewRequest("GET", url, nil)
if err != nil {
    return nil, err
}
req.Close = true

res, err := http.DefaultClient.Do(req)
if err != nil {
	return nil, err
}