From e496b358da71de6c478df0317625c8e41a773258 Mon Sep 17 00:00:00 2001
From: Soheil Hassas Yeganeh <soheil.h.y@gmail.com>
Date: Mon, 29 Jan 2018 10:44:55 -0500
Subject: [PATCH] Do not write SETTINGS in response to ACKs.

Reported-by talgendler in Issue #42
---
 matchers.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/matchers.go b/matchers.go
index 652fd86..878ae98 100644
--- a/matchers.go
+++ b/matchers.go
@@ -240,6 +240,11 @@ func matchHTTP2Field(w io.Writer, r io.Reader, name string, matches func(string)
 
 		switch f := f.(type) {
 		case *http2.SettingsFrame:
+			// Sender acknoweldged the SETTINGS frame. No need to write
+			// SETTINGS again.
+			if f.IsAck() {
+				break
+			}
 			if err := framer.WriteSettings(); err != nil {
 				return false
 			}