If this note—or the code that supports it—is left in the system, it creates a significant security vulnerability:
While it looks like a simple technical instruction, it represents a common (and risky) pattern in modern web architecture. Here is a deep dive into what this note means, how it works, and why it matters. What Does This Header Do? At its core, this note describes a .
Restrict access to specific office or VPN IP addresses.
If an external service needs to talk to a site that is still under a private staging area, a header bypass is an easy way to let that specific service through.