diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..82b6728a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+.idea
+/log/**/*
+!/log/.gitkeep
diff --git a/app/controllers/tests_controller.rb b/app/controllers/tests_controller.rb
index 1526a689..a0568ec8 100644
--- a/app/controllers/tests_controller.rb
+++ b/app/controllers/tests_controller.rb
@@ -1,11 +1,11 @@
 class TestsController < Simpler::Controller
-
   def index
     @time = Time.now
-  end
-
-  def create
 
+    headers['WEIRD_HEADER'] = '1234'
+    status(200)
+    render(plain: "Params sent: #{@request.params}")
   end
 
+  def create; end
 end
diff --git a/app/models/test.rb b/app/models/test.rb
index 86376668..98cea0cb 100644
--- a/app/models/test.rb
+++ b/app/models/test.rb
@@ -4,5 +4,4 @@
 #   Integer :level, default: 0
 # end
 class Test < Sequel::Model
-
 end
diff --git a/config.ru b/config.ru
index 3060cc20..2e044fa3 100644
--- a/config.ru
+++ b/config.ru
@@ -1,3 +1,7 @@
 require_relative 'config/environment'
+require_relative 'middleware/logger'
+
+use Logger
+use Rack::Reloader, 0
 
 run Simpler.application
diff --git a/config/routes.rb b/config/routes.rb
index 4a751251..6898f509 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -1,4 +1,4 @@
 Simpler.application.routes do
-  get '/tests', 'tests#index'
+  get '/tests/:id', 'tests#index'
   post '/tests', 'tests#create'
 end
diff --git a/lib/simpler.rb b/lib/simpler.rb
index f9dfe3c4..d4d365c9 100644
--- a/lib/simpler.rb
+++ b/lib/simpler.rb
@@ -2,7 +2,6 @@
 require_relative 'simpler/application'
 
 module Simpler
-
   class << self
     def application
       Application.instance
@@ -12,5 +11,4 @@ def root
       Pathname.new(File.expand_path('..', __dir__))
     end
   end
-
 end
diff --git a/lib/simpler/application.rb b/lib/simpler/application.rb
index 711946a9..d63147d6 100644
--- a/lib/simpler/application.rb
+++ b/lib/simpler/application.rb
@@ -6,7 +6,6 @@
 
 module Simpler
   class Application
-
     include Singleton
 
     attr_reader :db
@@ -28,6 +27,10 @@ def routes(&block)
 
     def call(env)
       route = @router.route_for(env)
+
+      return @router.not_found(env) unless route
+
+      route.match_params(env)
       controller = route.controller.new(env)
       action = route.action
 
@@ -53,6 +56,5 @@ def setup_database
     def make_response(controller, action)
       controller.make_response(action)
     end
-
   end
 end
diff --git a/lib/simpler/controller.rb b/lib/simpler/controller.rb
index 9383b035..4b74953b 100644
--- a/lib/simpler/controller.rb
+++ b/lib/simpler/controller.rb
@@ -2,13 +2,14 @@
 
 module Simpler
   class Controller
-
     attr_reader :name, :request, :response
 
     def initialize(env)
       @name = extract_name
       @request = Rack::Request.new(env)
+      @request.params.merge!(env['matched.params'])
       @response = Rack::Response.new
+      @body_written = false
     end
 
     def make_response(action)
@@ -17,11 +18,16 @@ def make_response(action)
 
       set_default_headers
       send(action)
-      write_response
+
+      write_from_convention_template unless @body_written
 
       @response.finish
     end
 
+    def append_path_params(params)
+      @request.params.merge!(params)
+    end
+
     private
 
     def extract_name
@@ -32,10 +38,11 @@ def set_default_headers
       @response['Content-Type'] = 'text/html'
     end
 
-    def write_response
+    def write_from_convention_template
       body = render_body
 
       @response.write(body)
+      @body_written = true
     end
 
     def render_body
@@ -47,8 +54,45 @@ def params
     end
 
     def render(template)
+      case template
+      when String
+        proceed_string_template(template)
+      when Hash
+        proceed_hash_options(template)
+      else
+        template_error("Template can be string or hash, but not #{template.class}.")
+      end
+
+      @body_written = true
+    end
+
+    def proceed_string_template(template)
       @request.env['simpler.template'] = template
     end
 
+    def proceed_hash_options(options)
+      if options.key?(:plain)
+        @request.env['simpler.render'] = :plain
+        @response.write(options[:plain].to_s)
+      else
+        template_error("Applying options #{options.keys} is not implemented yet")
+      end
+    end
+
+    def template_error(message)
+      @response.status = 500
+      @response.write(message)
+      @response.finish
+    end
+
+    def status(status)
+      puts('Status has already been set before setting') if @response.status
+
+      response.status = status
+    end
+
+    def headers
+      @response.headers
+    end
   end
 end
diff --git a/lib/simpler/router.rb b/lib/simpler/router.rb
index 14b3415c..37cb18e5 100644
--- a/lib/simpler/router.rb
+++ b/lib/simpler/router.rb
@@ -2,7 +2,6 @@
 
 module Simpler
   class Router
-
     def initialize
       @routes = []
     end
@@ -22,6 +21,16 @@ def route_for(env)
       @routes.find { |route| route.match?(method, path) }
     end
 
+    def not_found(env)
+      response = Rack::Response.new
+      method = env['REQUEST_METHOD'].downcase.to_sym
+      path = env['PATH_INFO']
+
+      response.status = 404
+      response.write("Cannot find route by path '#{path}' with method '#{method}'")
+      response.finish
+    end
+
     private
 
     def add_route(method, path, route_point)
@@ -36,6 +45,5 @@ def add_route(method, path, route_point)
     def controller_from_string(controller_name)
       Object.const_get("#{controller_name.capitalize}Controller")
     end
-
   end
 end
diff --git a/lib/simpler/router/route.rb b/lib/simpler/router/route.rb
index 4c66b4b7..b4c3b48b 100644
--- a/lib/simpler/router/route.rb
+++ b/lib/simpler/router/route.rb
@@ -1,7 +1,6 @@
 module Simpler
   class Router
     class Route
-
       attr_reader :controller, :action
 
       def initialize(method, path, controller, action)
@@ -12,9 +11,28 @@ def initialize(method, path, controller, action)
       end
 
       def match?(method, path)
-        @method == method && path.match(@path)
+        @method == method && path.match(path_to_regexp(@path))
+      end
+
+      def match_params(env)
+        params = {}
+        request_path_elements = env['PATH_INFO'].split('/')
+        @path.split('/').each_with_index do |param, index|
+          params[param.sub(':', '')] = request_path_elements[index] if param.start_with?(':')
+        end
+        env['matched.params'] = params
       end
 
+      private
+
+      def path_to_regexp(path)
+        regexp_body = path
+                      .split('/')
+                      .map { |s| s.start_with?(':') ? '\d+' : s }
+                      .join('/') + '(?:\/)?$'
+
+        Regexp.new(regexp_body)
+      end
     end
   end
 end
diff --git a/lib/simpler/view.rb b/lib/simpler/view.rb
index 19a73b34..7d98297a 100644
--- a/lib/simpler/view.rb
+++ b/lib/simpler/view.rb
@@ -2,7 +2,6 @@
 
 module Simpler
   class View
-
     VIEW_BASE_PATH = 'app/views'.freeze
 
     def initialize(env)
@@ -34,6 +33,5 @@ def template_path
 
       Simpler.root.join(VIEW_BASE_PATH, "#{path}.html.erb")
     end
-
   end
 end
diff --git a/log/.gitkeep b/log/.gitkeep
new file mode 100644
index 00000000..e69de29b
diff --git a/middleware/logger.rb b/middleware/logger.rb
new file mode 100644
index 00000000..2ea2d39c
--- /dev/null
+++ b/middleware/logger.rb
@@ -0,0 +1,40 @@
+class Logger
+  def initialize(app)
+    @app = app
+  end
+
+  def call(env)
+    @env = env
+    status, headers, body = @app.call(env)
+
+    log_entry = make_log_item(status, headers, body)
+    log(log_entry)
+
+    [status, headers, body]
+  end
+
+  def log(log_ingo)
+    filename = "#{Time.new.strftime('%d-%m-%Y')}.txt"
+    filepath = File.expand_path("log/#{filename}")
+
+    File.write(filepath, log_ingo, mode: File.exist?(filepath) ? 'a' : 'w')
+  end
+
+  def make_log_item(status, headers, _body)
+    response_info = collect_response_info
+    "
+    Request: #{@env['REQUEST_METHOD']} #{@env['REQUEST_METHOD']}
+    Handler: #{response_info[:controller]}##{response_info[:action]}
+    Parameters: #{query_string_parameters.merge(parameters)}
+    Response: #{status} [#{headers['Content-Type']}] #{response_info[:template]}"
+  end
+
+  def collect_response_info
+    controller = env['simpler.controller'].class.name
+    action = env['simpler.action']
+    parameters = env['matched.params'].merge(Rack::Utils.parse_query(env['QUERY_STRING']))
+    template = env['simpler.template'] || env['simpler.render']
+
+    { controller: controller, action: action, parameters: parameters, template: template }
+  end
+end