diff --git a/.travis.yml b/.travis.yml
index 5bf7457..acddd4a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,6 @@ services:
 before_script:
   - unset BUNDLE_GEMFILE
   - docker-compose run app bundle install
-  - docker-compose run app bundle exec appraisal install
 script:
-  - docker-compose run app bundle exec appraisal rspec
+  - docker-compose run app bundle exec rspec
   - docker-compose run app bundle exec rubocop
diff --git a/lib/logux/action_caller.rb b/lib/logux/action_caller.rb
index 751e0cb..da784c3 100644
--- a/lib/logux/action_caller.rb
+++ b/lib/logux/action_caller.rb
@@ -14,15 +14,19 @@ def initialize(action:, meta:)
     end
 
     def call!
-      logger.debug(
-        "Searching action for Logux action: #{action}, meta: #{meta}"
-      )
-      format(action_controller.public_send(action.action_type))
+      Logux.watch_action { call_action }
     rescue Logux::UnknownActionError, Logux::UnknownChannelError => e
       logger.warn(e)
       format(nil)
     end
 
+    protected
+
+    def call_action
+      logger.debug("Searching Logux action: #{action}, meta: #{meta}")
+      format(action_controller.public_send(action.action_type))
+    end
+
     private
 
     def format(response)
diff --git a/lib/logux/action_watcher.rb b/lib/logux/action_watcher.rb
new file mode 100644
index 0000000..c65062d
--- /dev/null
+++ b/lib/logux/action_watcher.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+module Logux
+  class ActionWatcher
+    def self.call(options = {}, &block)
+      new(options).call(&block)
+    end
+
+    attr_reader :options
+
+    def initialize(options = {})
+      raise ArgumentError, :options unless options.is_a?(Hash)
+
+      @options = options
+    end
+
+    def call
+      yield
+    end
+  end
+end
diff --git a/lib/logux/rack.rb b/lib/logux/rack.rb
index 7ecb4d2..8c2db50 100644
--- a/lib/logux/rack.rb
+++ b/lib/logux/rack.rb
@@ -50,8 +50,11 @@ def initialize(msg, meta: nil)
   autoload :Test, 'logux/test'
   autoload :ErrorRenderer, 'logux/error_renderer'
   autoload :Utils, 'logux/utils'
+  autoload :ActionWatcher, 'logux/action_watcher'
 
   configurable %i[
+    action_watcher
+    action_watcher_options
     auth_rule
     logger
     logux_host
@@ -68,6 +71,8 @@ def initialize(msg, meta: nil)
     config.on_error = proc {}
     config.auth_rule = proc { false }
     config.render_backtrace_on_error = true
+    config.action_watcher = Logux::ActionWatcher
+    config.action_watcher_options = {}
   end
 
   module Rack
@@ -113,6 +118,14 @@ def logger
       configuration.logger
     end
 
+    def action_watcher
+      configuration.action_watcher.new(configuration.action_watcher_options)
+    end
+
+    def watch_action
+      action_watcher.call { yield }
+    end
+
     def application
       Logux::Rack::App
     end
diff --git a/lib/logux/rack/app.rb b/lib/logux/rack/app.rb
index f8f90d4..47adb30 100644
--- a/lib/logux/rack/app.rb
+++ b/lib/logux/rack/app.rb
@@ -41,7 +41,7 @@ def meta_params
       end
 
       def handle_processing_errors(logux_stream, exception)
-        Logux.configuration.on_error.call(exception)
+        Logux.configuration.on_error&.call(exception)
         Logux.logger.error("#{exception}\n#{exception.backtrace.join("\n")}")
       ensure
         logux_stream.write(Logux::ErrorRenderer.new(exception).message)
diff --git a/lib/logux/version.rb b/lib/logux/rack/version.rb
similarity index 53%
rename from lib/logux/version.rb
rename to lib/logux/rack/version.rb
index 8cbfbab..d2f7598 100644
--- a/lib/logux/version.rb
+++ b/lib/logux/rack/version.rb
@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
 module Logux
-  VERSION = '0.1.0'
+  module Rack
+    VERSION = '0.1.0'
+  end
 end
diff --git a/logux-rack.gemspec b/logux-rack.gemspec
index c1a5f3a..3015886 100644
--- a/logux-rack.gemspec
+++ b/logux-rack.gemspec
@@ -2,11 +2,11 @@
 
 lib = File.expand_path('lib', __dir__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
-require 'logux/version'
+require 'logux/rack/version'
 
 Gem::Specification.new do |spec|
   spec.name          = 'logux-rack'
-  spec.version       = Logux::VERSION
+  spec.version       = Logux::Rack::VERSION
   spec.authors       = ['WildDima']
   spec.email         = ['dtopornin@gmail.com']
   spec.summary       = 'Rack application backend for Logux proxy server'
@@ -49,12 +49,11 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'configurations'
   spec.add_dependency 'nanoid'
   spec.add_dependency 'rack', '~> 2.0'
-  spec.add_dependency 'rest-client'
+  spec.add_dependency 'rest-client', '>= 1.7.3', '< 3'
   spec.add_dependency 'sinatra', '>= 2.0', '< 3'
   spec.add_development_dependency 'bundler', '~> 1.16'
   spec.add_development_dependency 'coveralls'
   spec.add_development_dependency 'factory_bot'
-  spec.add_development_dependency 'pg'
   spec.add_development_dependency 'pry'
   spec.add_development_dependency 'pry-byebug'
   spec.add_development_dependency 'puma'