Method: Rack::File#serving

Defined in:
lib/vendor/rack-1.5.2/lib/rack/file.rb

#serving(env) ⇒ Object 



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# File 'lib/vendor/rack-1.5.2/lib/rack/file.rb', line 66

def serving(env)
  last_modified = F.mtime(@path).httpdate
  return [304, {}, []] if env['HTTP_IF_MODIFIED_SINCE'] == last_modified

  headers = { "Last-Modified" => last_modified }
  mime = Mime.mime_type(F.extname(@path), @default_mime)
  headers["Content-Type"] = mime if mime

  # Set custom headers
  @headers.each { |field, content| headers[field] = content } if @headers

  response = [ 200, headers, env["REQUEST_METHOD"] == "HEAD" ? [] : self ]

  # NOTE:
  #   We check via File::size? whether this file provides size info
  #   via stat (e.g. /proc files often don't), otherwise we have to
  #   figure it out by reading the whole file into memory.
  size = F.size?(@path) || Utils.bytesize(F.read(@path))

  ranges = Rack::Utils.byte_ranges(env, size)
  if ranges.nil? || ranges.length > 1
    # No ranges, or multiple ranges (which we don't support):
    # TODO: Support multiple byte-ranges
    response[0] = 200
    @range = 0..size-1
  elsif ranges.empty?
    # Unsatisfiable. Return error, and file size:
    response = fail(416, "Byte range unsatisfiable")
    response[1]["Content-Range"] = "bytes */#{size}"
    return response
  else
    # Partial content:
    @range = ranges[0]
    response[0] = 206
    response[1]["Content-Range"] = "bytes #{@range.begin}-#{@range.end}/#{size}"
    size = @range.end - @range.begin + 1
  end

  response[1]["Content-Length"] = size.to_s
  response
end