How to create custom cacheKey?

[gijsdh]

So i want to create a custom cacheKey based on a attribute defined in a earlier filter.

So how would I go about that?
Would below work, or do I need to create a filter?
I am unsure how to get the httpServletRequest in the Bean.

@Service
public class MyService{
      
        @Context 
        HttpServletRequest  httpServletRequest;
      
	public String userId() {
		return Parse(request.getAttribute("id"));
	}
} 

expression = @myService.userId()

[MarcGiffing]

The root object in the expression is the HttpServletRequest object. It's properties are accessed directly:

cache-key=getAttribute("id")

• servlet: jakarta.servlet.http.HttpServletRequest (e.g. getRemoteAddr() or getRequestURI())
• webflux: org.springframework.http.server.reactive.ServerHttpRequest
• gateway: org.springframework.http.server.reactive.ServerHttpRequest