HTTP response headers of help center

Feature Request Summary: 

Either Zendesk Guide make the following HTTP response headers for their help centers mandatory or offers a customization of the HTTP response headers.

Description/Use Cases: 

Zendesk help center(s) are lacking some security HTTP response headers which is hurting our company's security rating and reputation.

• Strict-Transport-Security
• Content-Security-Policy
• X-Content-Type-Options
• Referrer-Policy

Business impact of limitation or missing feature:

That's a critical one for us, these leads to downgrading of our group by several sites and generally trust issues with potential customers.

Other necessary information or resources:

For example the rating of Zendesk's own help center (which applies to all Zendesk customer help centers):

https://securityheaders.com/?q=https%3A%2F%2Fsupport.zendesk.com%2Fhc%2Fde&followRedirects=on