Merge pull request moby#3652 from alexcb/patch-3

specify a `ResponseHeaderTimeout` value

Author: tonistiigi

util/resolver/resolver.go

@@ -206,6 +206,7 @@ func newDefaultTransport() *http.Transport {
 		MaxIdleConnsPerHost:   4,
 		TLSHandshakeTimeout:   10 * time.Second,
 		ExpectContinueTimeout: 5 * time.Second,
+		ResponseHeaderTimeout: 30 * time.Second,
 		TLSNextProto:          make(map[string]func(authority string, c *tls.Conn) http.RoundTripper),
 	}
 }