Catching the response with all headers I’m getting this:
HTTP/1.1 400 BAD REQUEST
Content-Length: 26
X-XSS-Protection: 1; mode=block
Content-Language: en
X-Content-Type-Options: nosniff
Vary: Accept-Language
X-Frame-Options: deny
Content-Type: text/html
<h1>Bad Request (400)</h1>