But what is it? Is it a security threat? A tracking mechanism? Or simply metadata for iCloud?
x-apple-i-md-m: AQIDBAUGBwgJCgsMDQ4PEBESExQVFhcYGRobHB0eHyAhIiM= x-apple-i-md-m
MDM enrollment hangs at "Verifying Device." Cause: The MDM server is stripping or altering x-apple-i-md-m before forwarding to Apple’s push gateway. Solution: Update your proxy configuration to pass all x-apple-* headers transparently. But what is it
This string is structured, not random. Analysis of thousands of Apple requests reveals that the value encodes specific device state information, likely a Base64-encoded protobuf (Protocol Buffer) or a proprietary binary plist. x-apple-i-md-m