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Proxies stripping it? Tell me more.

• throwaway2016a 2y ago
  (Sorry for the delay, I haven't checked HN is a while and just noticed this) So some proxies (forward and reverse) will strip this header for different reasons. The reverse proxies sometimes strip it to improve caching and/or because they were configured to have a allow-list of headers and this (being a less common one) was excluded. The forward proxies will sometimes strip it for privacy reasons (it can be used in fingerprinting) or for the same reason (they have a list of allowed headers and this isn't one).