From bd91a3207f4376bd63a72f6c5b1ebabb11747634 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lo=C3=AFc=20Hoguin?= <essen@ninenines.eu>
Date: Sat, 5 Jan 2019 16:21:53 +0100
Subject: Don't send empty data chunks

This was a bug in the case of HTTP/1.1 and an inconvenience
in the case of HTTP/2.
---
 src/gun.erl | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'src/gun.erl')

diff --git a/src/gun.erl b/src/gun.erl
index a8b76f8..55e70dd 100644
--- a/src/gun.erl
+++ b/src/gun.erl
@@ -436,7 +436,12 @@ request(ServerPid, Method, Path, Headers, Body, ReqOpts) ->
 
 -spec data(pid(), reference(), fin | nofin, iodata()) -> ok.
 data(ServerPid, StreamRef, IsFin, Data) ->
-	gen_statem:cast(ServerPid, {data, self(), StreamRef, IsFin, Data}).
+	case iolist_size(Data) of
+		0 when IsFin =:= nofin ->
+			ok;
+		_ ->
+			gen_statem:cast(ServerPid, {data, self(), StreamRef, IsFin, Data})
+	end.
 
 %% Tunneling.
 
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