Allow for setting the refferer policy security header

[Crevil]

It would be great to be able to set the Referrer-Policy security header in the Security Headers section of the Browser cache settings.

Link to the w3 specification: https://www.w3.org/TR/referrer-policy/

The possible values are:

enum ReferrerPolicy {
  "",
  "no-referrer",
  "no-referrer-when-downgrade",
  "same-origin",
  "origin",
  "strict-origin",
  "origin-when-cross-origin",
  "strict-origin-when-cross-origin",
  "unsafe-url"
};

[Crevil]

@nigrosimone I'll look into making a PR on this if that's ok with you?

[szepeviktor]

Thanks.

[nigrosimone]

@Crevil yes thanks! it's very appreciated! The Security Headers feature is made by @amiga-500, you can review her work on this prs:

"Security Headers" Section Added to Browser Cache
🔧 + Extra: #PR363 – Adds Default Values to CSP (Security Headers)
🔧 + Extra: #PR377 – Important Change – Session Cookies