From 41aafe05ae7baab132743fe2e0b866c28c533a81 Mon Sep 17 00:00:00 2001
From: Theo Arends <11044339+arendst@users.noreply.github.com>
Date: Mon, 12 Nov 2018 10:20:30 +0100
Subject: [PATCH] Change command WebSend

Change command WebSend Host header field from IP address to hostname (#4331)
---
 sonoff/_changelog.ino        | 1 +
 sonoff/xdrv_01_webserver.ino | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/sonoff/_changelog.ino b/sonoff/_changelog.ino
index f664eb7a6..ce35adbe0 100644
--- a/sonoff/_changelog.ino
+++ b/sonoff/_changelog.ino
@@ -1,6 +1,7 @@
 /* 6.3.0.7 20181111
  * Fix wifi connection errors using wifi disconnect and ESP.reset instead of ESP.restart
  * Fix Sonoff Pow R2 and Sonoff S31 Serial interface hang caused by Sonoff Basic R2 driver delay implementation (and possibly core bug)
+ * Change command WebSend Host header field from IP address to hostname (#4331)
  *
  * 6.3.0.6 20181110
  * Change GUI Configure Module by using AJAX for data fetch to cut page size (and memory use) by 40%
diff --git a/sonoff/xdrv_01_webserver.ino b/sonoff/xdrv_01_webserver.ino
index 74e6d32f6..6f99b30a1 100644
--- a/sonoff/xdrv_01_webserver.ino
+++ b/sonoff/xdrv_01_webserver.ino
@@ -1950,7 +1950,8 @@ int WebSend(char *buffer)
         String url = F("GET /cm?");
         url += uri;
         url += F(" HTTP/1.1\r\n Host: ");
-        url += IPAddress(host_ip).toString();
+//        url += IPAddress(host_ip).toString();
+        url += host;   // https://tools.ietf.org/html/rfc7230#section-5.4 (#4331)
         if (port) {
           url += F(" \r\n Port: ");
           url += port;