go-cdn-booster improvements: 1) pass Last-Modified response header, so http clients and proxies could send If-Modified-Since requests. 2) pass Connection: keep-alive response header, so http clients could re-use the same connection to go-cdn-booster. 3) pass Server: go-cdn-booster response header, so http clients could be aware of server software.
go-cdn-booster improvements:
1) pass Last-Modified response header, so http clients and proxies could send If-Modified-Since requests.
2) pass Connection: keep-alive response header, so http clients could re-use the same connection to go-cdn-booster.
3) pass Server: go-cdn-booster response header, so http clients could be aware of server software.

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