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

It should retain the https part.

Answer 2

Yes, because it's a relative path.

Answer 3

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

Answer 4

In short: Yes, the same URL scheme is used.

In detail: Relative URLs are resolved to absolute ones on the base of the current document’s URL. So if your URL is a https URL and you don’t specify the URL scheme (obviously because otherwise you would have an absolute URL), the resolved URL uses the same URL scheme as the base URL.