# Middlewares

## Built-in Middlewares

Kemal has built-in middlewares for common use cases.

### HTTP Basic Authorization

This middleware lets you add HTTP Basic Authorization to your Kemal application.
You can easily use this middleware with `basic_auth` macro like below.

```crystal
require "kemal"

basic_auth "username", "password"

get "/" do
  "This won't render without correct username and password."
end

```

## Custom middlewares

You can create your own middleware by inheriting from ```HTTP::Handler```

```crystal
class CustomHandler < HTTP::Handler
  def call(request)
    puts "Doing some custom stuff here"
    call_next request
  end
end

Kemal.config.add_handler CustomHandler.new
```