websocket.cr

require "http/server"

handler = ->(request : HTTP::Request) do
  HTTP::Response.ok("text/plain", "ok\n")
end

middleware = HTTP::Server.build_middleware [
  HTTP::LogHandler.new,
  HTTP::ErrorHandler.new,
  HTTP::WebSocketHandler.new do |ws|
    ws.onmessage do |data|
      puts data
    end
  end
], handler

server = HTTP::Server.new(3000, middleware)
server.listen