module Rack::Utils

def build_nested_query(value, prefix = nil)
  case value
  when Array
    value.map { |v|
      build_nested_query(v, "#{prefix}[]")
    }.join("&")
  when Hash
    value.map { |k, v|
      build_nested_query(v, prefix ? "#{prefix}[#{k}]" : k)
    }.delete_if(&:empty?).join('&')
  when nil
    escape(prefix)
  else
    raise ArgumentError, "value must be a Hash" if prefix.nil?
    "#{escape(prefix)}=#{escape(value)}"
  end
end