Adding value dynamically in the header of API action of server connect is not populating

I added api action in the server connect for calling rest api from my java server. For security of API, I was trying to pass authorization and digest key in the header of API action dynamically. When I run my website and see in the developer tool of browser.Then I saw this API is throwing that you are not authorized because authorization and digest key is not populating in the header of API call. Please take a look at it and resolve asap. Thanks