# Dev-server-only fix: WEBrick's FileHandler#not_modified? treats a Range
# request's If-Range header the same as If-None-Match, replying 304 (no body)
# instead of 206 with the requested bytes. Browsers rely on ranged requests
# (with If-Range) to fetch a video's trailing moov atom when seeking/loading
# metadata, so this breaks video playback under `jekyll serve`.
# See https://github.com/ruby/webrick/blob/master/lib/webrick/httpservlet/filehandler.rb
#
require 'webrick'

module WebrickRangeFix
  def not_modified?(req, res, mtime, etag)
    req['Range'] ? false : super
  end
end

WEBrick::HTTPServlet::DefaultFileHandler.prepend(WebrickRangeFix)