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Apple uses a suite of headers starting with x-apple-i-md- to establish a "Chain of Trust." The suffix -m in x-apple-i-md-m typically stands for Message or Metadata.
Its primary role is to carry a cryptographic payload (a blob) that proves the device is a genuine Apple product (iPhone, iPad, Mac) and that it has not been compromised (e.g., jailbroken or attempting to spoof its identity).
The x-apple-i-md-m header is primarily used by Apple’s backend services (specifically those handling authentication, iCloud, and push notifications) to verify the integrity of the device making the request.
It is most commonly seen in requests to:
To manage who can contact you: