feat: Via header for CDN loop detection
This adds an option to set the Via
HTTP header with a "pseudonym" string token.
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Helps prevent CDN looping. Right now the only place this might happen is when ACME proxy mode is used. Going forward there could also be pull-based content caching.
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Intended for use in Commons Host CDN to signal which edge PoP served the response. Useful for debugging, analytics, or even obscure branding to HTTP alpha nerds.
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closes #45 (closed)