def URINorm.urinorm(uri)
uri = URI.parse(uri)
raise URI::InvalidURIError.new('no scheme') unless uri.scheme
uri.scheme = uri.scheme.downcase
unless ['http','https'].member?(uri.scheme)
raise URI::InvalidURIError.new('Not an HTTP or HTTPS URI')
end
raise URI::InvalidURIError.new('no host') unless uri.host
uri.host = uri.host.downcase
uri.path = remove_dot_segments(uri.path)
uri.path = '/' if uri.path.length == 0
uri = uri.normalize.to_s
uri = uri.gsub(PERCENT_ESCAPE_RE) {
sub = $&[1..2].to_i(16).chr
reserved(sub) ? $&.upcase : sub
}
return uri
end