Regarding mixed content warning, there is an image that comes from Tasty demo site through http:
You can replace this image with something from your own Media Library (you can save this image).
HTTP Strict Transport Security and Secure cookie, you can learn more about these on Wikipedia, here are relevant links:
HTTP Strict Transport Security (HSTS) is a web security policy mechanism that helps to protect websites against protocol downgrade attacks and cookie hijacking. It allows web servers to declare that web browsers (or other complying user agents) should interact with it using only secure HTTPS connections, and never via the insecure HTTP protocol. HSTS is an IETF standards track protocol and is specified in RFC 6797.
The HSTS Policy is communicated by the server to the user agent via an HTTPS res...
Secure cookies are a type of HTTP cookie that have Secure attribute set, which limits the scope of the cookie to "secure" channels (where "secure" is defined by the user agent, typically web browser). When a cookie has the Secure attribute, the user agent will include the cookie in an HTTP request only if the request is transmitted over a secure channel (typically HTTPS). Although seemingly useful for protecting cookies from active network attackers, the Secure attribute protects only the c Even ...
Please feel free to ask any other questions that you might have.
Kind Regards, Roman.