fix: don't set the Accept header by default

src/HttpCall/Request/BrowserKit.php

@@ -68,6 +68,12 @@ public function send($method, $url, $parameters = [], $files = [], $content = nu
         $client = $this->mink->getSession()->getDriver()->getClient();
 
         $client->followRedirects(false);
+
+        // Workaround for https://github.com/symfony/symfony/issues/33393: prevent a default Accept header to be set
+        if (!isset($headers['HTTP_ACCEPT']) && '' === $client->getServerParameter('HTTP_ACCEPT')) {
+            $headers['HTTP_ACCEPT'] = null;
+        }
+
         $client->request($method, $url, $parameters, $files, $headers, $content);
         $client->followRedirects(true);
         $this->resetHttpHeaders();
@@ -78,11 +84,15 @@ public function send($method, $url, $parameters = [], $files = [], $content = nu
     public function setHttpHeader($name, $value)
     {
         $client = $this->mink->getSession()->getDriver()->getClient();
-        // Goutte\Client
         if (method_exists($client, 'setHeader')) {
+            /**
+             * @var \Goutte\Client $client
+             */
             $client->setHeader($name, $value);
         } else {
-            // Symfony\Component\BrowserKit\Client
+            /**
+             * @var \Symfony\Component\BrowserKit\HttpBrowser $client
+             */
 
             /* taken from Behat\Mink\Driver\BrowserKitDriver::setRequestHeader */
             $contentHeaders = ['CONTENT_LENGTH' => true, 'CONTENT_MD5' => true, 'CONTENT_TYPE' => true];

tests/features/rest.feature

@@ -97,7 +97,11 @@ Feature: Testing RESTContext
         Congratulations, you've correctly set up your apache environment.
         """
 
-    @>php5.5
+    Scenario: Accept header should not be set by dfault
+      When I send a GET request to "/rest/index.php"
+      Then I should not see "HTTP_ACCEPT"
+
+  @>php5.5
     Scenario: Set content headers in POST request
         When I add "Content-Type" header equal to "xxx"
         When I send a "POST" request to "rest/index.php" with body:

tests/fixtures/www/rest/index.php

@@ -18,7 +18,7 @@
 You have sent a <?php print $_SERVER['REQUEST_METHOD']; ?> request.
 
 <?php print sizeof($_SERVER); ?> header(s) received.
-<?php foreach($_SERVER as $key => $value): ?>
+<?php foreach(array_filter($_SERVER) as $key => $value): ?>
   <br /><?php print $key ?> : <?php print $value; ?>
 <?php endforeach; ?>