Add request and context to headers route function

[md384]

We would like to be able to determine route headers based on the request or context. Our current use-case is that we have different cache-control headers for users vs bots and that is something we'd determine from the request (or possibly context if we add it there before processing the request). We have a number of other use-case (mostly around cache-control headers) but I can see this being useful for other headers too.

The current HeadersFunction interface does not appear to support my use-case currently.

Note: We're in the process of upgrading to RR7 so perhaps there is a better way to do this but it seems like adding the request and context like our route functions would be beneficial.

[sergiodxa]

You can use the request and context in the loader and then the result in HeadersFunction

[md384]

I guess that would work but seems more of a workaround than a solution given in this case the headers I want to set are not dependent on loader data. Would be nice to be able to separate the logic into just the headers function.