From a1c107826bf2a7b414d3ee660e95b281f93928ae Mon Sep 17 00:00:00 2001
From: Maks3w <github.maks3w@virtualplanets.net>
Date: Thu, 11 Jun 2015 23:22:08 +0200
Subject: [PATCH] [ServerRequest] Host header is not set when URI has one

> You can opt-in to preserving the original state of the Host header by passing true for the second ($preserveHost) argument. When this argument is set to true, the returned request will not update the Host header of the returned message -- unless the message contains no Host header.

**unless the message contains no Host header.** So $preserveHost MUST be ignored if message does not have a Host header
---
 src/RequestTrait.php | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/RequestTrait.php b/src/RequestTrait.php
index 048ac4b7..7bddf002 100644
--- a/src/RequestTrait.php
+++ b/src/RequestTrait.php
@@ -26,6 +26,7 @@
  * @property array $headers
  * @property array $headerNames
  * @property StreamInterface $stream
+ * @method bool hasHeader(string $header)
  */
 trait RequestTrait
 {
@@ -251,7 +252,7 @@ public function withUri(UriInterface $uri, $preserveHost = false)
         $new = clone $this;
         $new->uri = $uri;
 
-        if ($preserveHost) {
+        if ($preserveHost && $this->hasHeader('Host')) {
             return $new;
         }