try_precompressed_files

# File actionpack/lib/action_dispatch/middleware/static.rb, line 117 def try_precompressed_files(filepath, headers, accept_encoding)) each_precompressed_filepath(filepath) do |content_encoding, precompressed_filepath| if file_readable? precompressed_filepath # Identity encoding is default, so we skip Accept-Encoding # negotiation and needn't set Content-Encoding. # # Vary header is expected when we've found other available # encodings that Accept-Encoding ruled out. if content_encoding == "identity" return precompressed_filepath, headers else headers["Vary"] = "Accept-Encoding" if accept_encoding.any? { |enc, _| /\b#{content_encoding}\b/.match?(enc) } headers["Content-Encoding"] = content_encoding return precompressed_filepath, headers end end end end end