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It is conventional to use
X-
as a prefix for non-standard HTTP headers, and this is quite common in WordPress applications, including cache handling applications.The use of
X-
as a prefix is generally not recommended for new protocols, for reasons outlined here:https://datatracker.ietf.org/doc/html/rfc6648
However, in this case we are not expecting the debug headers in this plugin to become a widely adopted convention, and using
X-
seems like the least surprising naming to use.