If Modified Since

In Edge Cloud, I have a proxy which accepts requests (GET & POST) then formats them in an AssignMessage to the backend service. I would like to add functionality for "If Modified Since" header to be passed to the back end service if the client decides to add it to their request. I am making the assumption since I am formatting the clients request once it gets to Apigee, then I must add in functionality for all the headers which can be passed, i.e. if I do not format the request for "If Modified Since" header, then it will be ignored. Looking for examples on Apigee Docs I have not found any examples on how to do this. Best guess is to simply add "If Modified Since" as a header in the AssignMessage policy? Does anyone have any working examples of how to do this? Any and all help is appreciated.

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