From d3f7665529394f80dd051b2b8bec16f9ba508e93 Mon Sep 17 00:00:00 2001
From: Star Brilliant <m13253@hotmail.com>
Date: Wed, 29 Nov 2017 10:33:16 +0800
Subject: [PATCH] Check HTTP status code

---
 doh-client/client.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/doh-client/client.go b/doh-client/client.go
index 4d76cc9..717658f 100644
--- a/doh-client/client.go
+++ b/doh-client/client.go
@@ -183,6 +183,12 @@ func (c *Client) handlerFunc(w dns.ResponseWriter, r *dns.Msg, isTCP bool) {
 		w.WriteMsg(reply)
 		return
 	}
+	if resp.StatusCode != 200 {
+		log.Printf("Server returned error: %s\n", resp.Status)
+		reply.Rcode = dns.RcodeServerFailure
+		w.WriteMsg(reply)
+		return
+	}
 
 	body, err := ioutil.ReadAll(resp.Body)
 	if err != nil {