Understanding different Referrer-policy and what is sent when

Question

I am creating a class (es) in php to validate if referrers received in the headers adhere to the Referrer-policy set for the document.

I have tried to create a table which will tell me when a referer is sent and what to expect in them. However I could not find relevant information for the following cases:

1. origin-when-cross-origin - what to expect for same origin requests when the protocol improves
2. strict-origin - what to expect for same origin requests when the protocol improves

Reference Document

The below table shows the current status of where I am.

referrer-policy	so & ps	so & pi	so & pd	co & ps	co & pi	co & pd
no-referrer	none	none	none	none	none	none
no-referrer-when-downgrade	comUrl	comUrl	none	comUrl	comUrl	none
origin	origin	origin	origin	origin	origin	origin
origin-when-cross-origin	comUrl	??	origin	origin	origin	origin
same-origin	comUrl	comUrl	comUrl	none	none	none
strict-origin	origin	??	none	origin	origin	none
strict-origin-when-cross-origin	comUrl	comUrl	none	orgin	origin	none
unsafe-url	comUrl	comUrl	comUrl	comUrl	comUrl	comUrl

Please read the table as per the following legends

• so -> same origin,
• co -> cross origin,
• ps -> protocol same (http -> http, https -> https),
• pi -> protocol improves (http -> https)
• pd -> protocol downgrades (https -> http or https -> file and I assume http -> file too),
• Origin -> scheme, hostname, and port
• comUrl -> origin, path, and querystring (basically skips user, pass and fragment ie. anything after #)

So what is the expected response in the two cases? Also am I correct in assuming a protocol downgrade when an http page makes a request to file