muti-file-upload.rb

require 'sinatra'

get '/' do
  haml :upload
end

post '/show' do
  @sinatra_params = params
  @rack_request   = request
  haml :results
end

__END__
@@ layout
!!! 5
%html
  %head
  %body
    = yield

@@ upload
%form(method='post' action='/show' enctype='multipart/form-data')
  %p
    %input(type='file' name='uploads' multiple='multiple')
  %p
    %button(type='submit') upload

@@ results
%h1 Results

%h2 Sinatra Params
= Rack::Utils.escape_html( @sinatra_params.inspect )

%hr

%h2 Rack Request
= Rack::Utils.escape_html( @rack_request.inspect )