x_headers field added. This field indicates how the plugin handles the headers
The field is set to
append by default, but can be set to one of the following options:
append: Append information from this hop to the headers.
transparent: Leave headers unchanged, as if not using a proxy.
delete: Remove all headers including those that should be added for this hop, as if you are the originating client.
Note that all options respect the trusted IP setting, and will ignore last hop headers if they are not from clients with trusted IPs.