concurrent stitcher

stitcher.go

func Stitcher(w http.ResponseWriter, r *http.Request) {
	urls := r.URL.Query()["url"]

	if len(urls) == 0 {
		http.Error(w, "please provide a url querystring value", http.StatusBadRequest)
		return
	}

	bodies := make(chan io.ReadCloser, len(urls))

	for _, url := range urls {
		go func(bodies chan io.ReadCloser, url string) {
			res, _ := http.Get(url)
			bodies <- res.Body
		}(bodies, url)
	}

	for i:=0; i < len(urls); i++ {
		body := <-bodies
		defer body.Close()
		io.Copy(w, body)
	}
}