From 890deda2b2187b563b28d31a30516a6273bdcf2e Mon Sep 17 00:00:00 2001
From: Alexey Shockov <alexey@shockov.com>
Date: Fri, 15 Sep 2017 15:32:00 +0200
Subject: [PATCH] Proper service headers modification (#1913)

---
 src/Client.php | 28 ++++++++++++++++++----------
 1 file changed, 18 insertions(+), 10 deletions(-)

diff --git a/src/Client.php b/src/Client.php
index de4df8a5c..6b35d892b 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -290,7 +290,14 @@ private function transfer(RequestInterface $request, array $options)
      */
     private function applyOptions(RequestInterface $request, array &$options)
     {
-        $modify = [];
+        $modify = [
+            'set_headers' => [],
+        ];
+
+        if (isset($options['headers'])) {
+            $modify['set_headers'] = $options['headers'];
+            unset($options['headers']);
+        }
 
         if (isset($options['form_params'])) {
             if (isset($options['multipart'])) {
@@ -302,6 +309,8 @@ private function applyOptions(RequestInterface $request, array &$options)
             }
             $options['body'] = http_build_query($options['form_params'], '', '&');
             unset($options['form_params']);
+            // Ensure that we don't have the header in different case and set the new value.
+            $options['_conditional'] = Psr7\_caseless_remove(['Content-Type'], $options['_conditional']);
             $options['_conditional']['Content-Type'] = 'application/x-www-form-urlencoded';
         }
 
@@ -313,24 +322,19 @@ private function applyOptions(RequestInterface $request, array &$options)
         if (isset($options['json'])) {
             $options['body'] = \GuzzleHttp\json_encode($options['json']);
             unset($options['json']);
+            // Ensure that we don't have the header in different case and set the new value.
+            $options['_conditional'] = Psr7\_caseless_remove(['Content-Type'], $options['_conditional']);
             $options['_conditional']['Content-Type'] = 'application/json';
         }
 
         if (!empty($options['decode_content'])
             && $options['decode_content'] !== true
         ) {
+            // Ensure that we don't have the header in different case and set the new value.
+            $options['_conditional'] = Psr7\_caseless_remove(['Accept-Encoding'], $modify['set_headers']);
             $modify['set_headers']['Accept-Encoding'] = $options['decode_content'];
         }
 
-        if (isset($options['headers'])) {
-            if (isset($modify['set_headers'])) {
-                $modify['set_headers'] = $options['headers'] + $modify['set_headers'];
-            } else {
-                $modify['set_headers'] = $options['headers'];
-            }
-            unset($options['headers']);
-        }
-
         if (isset($options['body'])) {
             if (is_array($options['body'])) {
                 $this->invalidBody();
@@ -344,6 +348,8 @@ private function applyOptions(RequestInterface $request, array &$options)
             $type = isset($value[2]) ? strtolower($value[2]) : 'basic';
             switch ($type) {
                 case 'basic':
+                    // Ensure that we don't have the header in different case and set the new value.
+                    $modify['set_headers'] = Psr7\_caseless_remove(['Authorization'], $modify['set_headers']);
                     $modify['set_headers']['Authorization'] = 'Basic '
                         . base64_encode("$value[0]:$value[1]");
                     break;
@@ -382,6 +388,8 @@ private function applyOptions(RequestInterface $request, array &$options)
         $request = Psr7\modify_request($request, $modify);
         if ($request->getBody() instanceof Psr7\MultipartStream) {
             // Use a multipart/form-data POST if a Content-Type is not set.
+            // Ensure that we don't have the header in different case and set the new value.
+            $options['_conditional'] = Psr7\_caseless_remove(['Content-Type'], $options['_conditional']);
             $options['_conditional']['Content-Type'] = 'multipart/form-data; boundary='
                 . $request->getBody()->getBoundary();
         }