Edit browser JavaScript agent to send additional header

[ronmacdonald]

Due to network NAT'ing, user IP is not available in our organizations RUM monitoring.  I know there are various request headers evaluated and how the mapping of IPs to geolocation occur. I also understand the monitored application can capture information and send headers in requests.  I was wondering if anyone has tried to alter the Dynatrace browser javascript agent to capture additional data, like the user IP, and send a custom header with this address when sending RUM data/beacon signals?

[HannahM]

Is this information already being held in a different header? You can set the IP determination rules here

[ronmacdonald]

We use a hosted solution for proxy & NAT'ing that doesn't set the headers as expected.  Essentially 'x-Forwarded-for' is being set to the proxy address, not the actual client.  Looking for options to set a custom header to better geo-locate our private & public IP clients.