Add --no-proxy flag to disable http proxy.

goget.go

@@ -23,6 +23,7 @@ type client struct {
 	ReadTimeout    time.Duration
 	Retries        int
 	RetryWait      time.Duration
+	NoProxy        bool
 }
 
 func main() {
@@ -38,6 +39,7 @@ func main() {
 	flag.DurationVar(&c.ReadTimeout, "read-timeout", 10*time.Second, "TCP connections that that are longer idle will be aborted")
 	flag.BoolVar(&c.Insecure, "insecure", false, "Disable TLS certificate verification.")
 	flag.BoolVar(&showVersion, "version", false, "Show version and exit.")
+	flag.BoolVar(&c.NoProxy, "no-proxy", false, "Ignore *_proxy environment variables.")
 
 	flag.StringVar(&filename, "filename", "", "Filename / path where to write downloaded file to. Defaults to filename of the URL.")
 	flag.Parse()
@@ -95,6 +97,12 @@ func (c *client) DownloadFile(filename string, url string) (err error) {
 		},
 	}
 
+	if c.NoProxy {
+		tr.Proxy = nil
+	} else {
+		tr.Proxy = http.ProxyFromEnvironment
+	}
+
 	client := &http.Client{Transport: tr}
 
 	// Get the data