Merge branch '3.0' into 3.1

* 3.0:
  [Yaml] fix exception contexts
  People - person singularization
  [Yaml] properly handle unindented collections
  [Serializer] Add test for ignored attributes during denormalization
  chomp newlines only at the end of YAML documents
  Fixed server status command when port has been omitted
  Update UPGRADE FROM 2.x to 3.0
  fix removed commands wording in upgrade file
  Catch \Throwable
  Catch \Throwable
  [DependencyInjection] Avoid generating call_user_func in more cases
  [Validator] Support for DateTimeImmutable
  [FrameworkBundle] update upgrade instructions
  Use levenshtein level for better Bundle matching
  [WebProfilerBundle] Fix CORS ajax security issues
  remove methods that were needed for PHP 5.3
  [DX][DI] Make Autowiring exceptions more future friendly

Author: fabpot

Resources/views/Profiler/base_js.html.twig

@@ -82,6 +82,20 @@
 
             requestStack = [],
 
+            extractHeaders = function(xhr, stackElement) {
+                // Here we avoid to call xhr.getResponseHeader in order to
+                // prevent polluting the console with CORS security errors
+                var allHeaders = xhr.getAllResponseHeaders();
+                var ret;
+
+                if (ret = allHeaders.match(/^x-debug-token:\s+(.*)$/im)) {
+                    stackElement.profile = ret[1];
+                }
+                if (ret = allHeaders.match(/^x-debug-token-link:\s+(.*)$/im)) {
+                    stackElement.profilerUrl = ret[1];
+                }
+            },
+
             renderAjaxRequests = function() {
                 var requestCounter = document.querySelectorAll('.sf-toolbar-ajax-requests');
                 if (!requestCounter.length) {
@@ -255,8 +269,7 @@
                                 stackElement.loading = false;
                                 stackElement.error = self.status < 200 || self.status >= 400;
                                 stackElement.statusCode = self.status;
-                                stackElement.profile = self.getResponseHeader("X-Debug-Token");
-                                stackElement.profilerUrl = self.getResponseHeader("X-Debug-Token-Link");
+                                extractHeaders(self, stackElement);
 
                                 Sfjs.renderAjaxRequests();
                             }