def build_rack_env(request)
uri = request.uri
headers = request.headers || {}
body = request.body || ''
env = {
'REQUEST_METHOD' => request.method.to_s.upcase,
'CONTENT_TYPE' => headers.delete('Content-Type'),
'CONTENT_LENGTH' => body.size,
'PATH_INFO' => uri.path,
'QUERY_STRING' => uri.query || '',
'SERVER_NAME' => uri.host
}
env['rack.input'] = StringIO.new(body)
env['rack.version'] = Rack::VERSION
env['rack.url_scheme'] = uri.scheme
env['rack.run_once'] = true
env['rack.session'] = session
headers.each do |k, v|
env["HTTP_#{k.tr('-','_').upcase}"] = v
end
env
end