module Sinatra::Helpers

def send_file(path, opts={})

Use the contents of the file as the response body and attempt to
def send_file(path, opts={})
  stat = File.stat(path)
  last_modified stat.mtime
  content_type media_type(opts[:type]) ||
    media_type(File.extname(path)) ||
    response['Content-Type'] ||
    'application/octet-stream'
  response['Content-Length'] ||= (opts[:length] || stat.size).to_s
  halt StaticFile.open(path, 'rb')
rescue Errno::ENOENT
  not_found
end