Is https retained on relative form action URLs?

Question

Consider a page with a form that is visited via https. If the form action has a relative URL to the form page, is the https protocol retained?

Ex: you visit:

https://example.com/cart.html

which contains the form tag:

<form name="form1" method="post" action="SubmitOrder.aspx" id="form1">

Is the form submitted via https or http?

Answer 1

Yes, because it's a relative path.

Answer 2

Yes, relative paths always stay. Direct URLs are only needed when switching between http/https or vice versa.