Issue #3083183 by larowlan, Wim Leers, acbramley: FunctionalJavaScript tests...

Issue #3083183 by larowlan, Wim Leers, acbramley: FunctionalJavaScript tests fail because newer versions of curl/selenium webdriver require additional headers

core/tests/Drupal/FunctionalJavascriptTests/WebDriverCurlService.php

@@ -42,6 +42,11 @@ public function execute($requestMethod, $url, $parameters = NULL, $extraOptions
             }
             else {
               $customHeaders[] = 'Content-Length: 0';
+
+              // Suppress "Transfer-Encoding: chunked" header automatically
+              // added by cURL that causes a 400 bad request (bad
+              // content-length).
+              $customHeaders[] = 'Transfer-Encoding:';
             }
 
             // Suppress "Expect: 100-continue" header automatically added by
@@ -62,6 +67,11 @@ public function execute($requestMethod, $url, $parameters = NULL, $extraOptions
             }
             else {
               $customHeaders[] = 'Content-Length: 0';
+
+              // Suppress "Transfer-Encoding: chunked" header automatically
+              // added by cURL that causes a 400 bad request (bad
+              // content-length).
+              $customHeaders[] = 'Transfer-Encoding:';
             }
 
             // Suppress "Expect: 100-continue" header automatically added by