wrap-file-info (clj)

Wrap a handler such that responses with a file for a body will have corresponding Content-Type, Content-Length, and Last Modified headers added if they can be determined from the file. If the request specifies a If-Modified-Since header that matches the last modification date of the file, a 304 Not Modified response is returned. If two arguments are given, the second is taken to be a map of file extensions to content types that will supplement the default, built-in map.