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qzi/etag.rb

Forked from dchentech/etag.rb
Created December 4, 2013 08:37
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etag.rb
# 项目提供动态的文件下载，由于文件系统里的位置因加了自定义的目录分级，而与和URL有偏差，所以需要经过控制器来重写文件路径来读取，在此也保证了当前请求静态文件在磁盘上只有一份以节约空间。
# 为了避免单个客户端多次请求同一个文件，在该控制器方法里加上HTTP头部的ETag来进行304缓存。
def file
response.headers['Etag'] = Digest::SHA1.hexdigest(@your_file_instance)
send_file @your_file_instance.path
end
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