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Which reverse-proxies support HTTP/1.1 ETag and If-None-Match headers?

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http://serverfault.com – I'm developing a caching system for an ecommerce platform that will use a reverse proxy for caching. I plan to handle invalidation by using proper HTTP/1.1 headers. That is, I will set an ETag on first generation of the content and cache that ETag value in the application. The Cache-Control header will specify "must-revalidate" so the proxy should set If-None-Match header on subsequent requests with the ETag. The application will lookup the cached ETag value and if it matches it will send a 304 response, otherwise it will generate a full 200 response. I hoped to use nginx but I can't tell for (HowTos)