diff --git a/spec/context_spec.cr b/spec/context_spec.cr
index 0148d43..ea1dbb6 100644
--- a/spec/context_spec.cr
+++ b/spec/context_spec.cr
@@ -1,102 +1,72 @@
 require "./spec_helper"
 
 describe "Context" do
-  context "headers" do
-    it "sets content type" do
-      get "/" do |env|
-        env.response.content_type = "application/json"
-        "Hello"
-      end
-      request = HTTP::Request.new("GET", "/")
-      client_response = call_request_on_app(request)
-      client_response.headers["Content-Type"].should eq("application/json")
-    end
-
-    it "parses headers" do
-      get "/" do |env|
-        name = env.request.headers["name"]
-        "Hello #{name}"
-      end
-      headers = HTTP::Headers.new
-      headers["name"] = "kemal"
-      request = HTTP::Request.new("GET", "/", headers)
-      client_response = call_request_on_app(request)
-      client_response.body.should eq "Hello kemal"
-    end
-
-    it "sets response headers" do
-      get "/" do |env|
-        env.response.headers.add "Accept-Language", "tr"
-      end
-      request = HTTP::Request.new("GET", "/")
-      client_response = call_request_on_app(request)
-      client_response.headers["Accept-Language"].should eq "tr"
+  it "sets content type" do
+    app = Kemal::Base.new
+    app.get "/" do |env|
+      env.response.content_type = "application/json"
+      "Hello"
     end
+    request = HTTP::Request.new("GET", "/")
+    client_response = call_request_on_app(app, request)
+    client_response.headers["Content-Type"].should eq("application/json")
   end
 
-  context "storage" do
-    it "can store primitive types" do
-      before_get "/" do |env|
-        env.set "before_get", "Kemal"
-        env.set "before_get_int", 123
-        env.set "before_get_float", 3.5
-      end
+  it "parses headers" do
+    app = Kemal::Base.new
+    app.get "/" do |env|
+      name = env.request.headers["name"]
+      "Hello #{name}"
+    end
+    headers = HTTP::Headers.new
+    headers["name"] = "kemal"
+    request = HTTP::Request.new("GET", "/", headers)
+    client_response = call_request_on_app(app, request)
+    client_response.body.should eq "Hello kemal"
+  end
 
-      get "/" do |env|
-        {
-          before_get:       env.get("before_get"),
-          before_get_int:   env.get("before_get_int"),
-          before_get_float: env.get("before_get_float"),
-        }
-      end
+  it "sets response headers" do
+    app = Kemal::Base.new
+    app.get "/" do |env|
+      env.response.headers.add "Accept-Language", "tr"
+    end
+    request = HTTP::Request.new("GET", "/")
+    client_response = call_request_on_app(app, request)
+    client_response.headers["Accept-Language"].should eq "tr"
+  end
 
-      request = HTTP::Request.new("GET", "/")
-      io = IO::Memory.new
-      response = HTTP::Server::Response.new(io)
-      context = HTTP::Server::Context.new(request, response)
-      Kemal::FilterHandler::INSTANCE.call(context)
-      Kemal::RouteHandler::INSTANCE.call(context)
-
-      context.get("before_get").should eq "Kemal"
-      context.get("before_get_int").should eq 123
-      context.get("before_get_float").should eq 3.5
+  it "can store variables" do
+    app = Kemal::Base.new
+    app.before_get "/" do |env|
+      t = TestContextStorageType.new
+      t.id = 32
+      a = AnotherContextStorageType.new
+      env.set "key", "value"
+      env.set "before_get", "Kemal"
+      env.set "before_get_int", 123
+      env.set "before_get_context_test", t
+      env.set "another_context_test", a
+      env.set "before_get_float", 3.5
     end
 
-    it "can store custom types" do
-      before_get "/" do |env|
-        t = TestContextStorageType.new
-        t.id = 32
-        a = AnotherContextStorageType.new
-
-        env.set "before_get_context_test", t
-        env.set "another_context_test", a
-      end
-
-      get "/" do |env|
-        {
-          before_get_context_test: env.get("before_get_context_test"),
-          another_context_test:    env.get("another_context_test"),
-        }
-      end
-
-      request = HTTP::Request.new("GET", "/")
-      io = IO::Memory.new
-      response = HTTP::Server::Response.new(io)
-      context = HTTP::Server::Context.new(request, response)
-      Kemal::FilterHandler::INSTANCE.call(context)
-      Kemal::RouteHandler::INSTANCE.call(context)
-
-      context.get("before_get_context_test").as(TestContextStorageType).id.should eq 32
-      context.get("another_context_test").as(AnotherContextStorageType).name.should eq "kemal-context"
+    app.get "/" do |env|
+      env.set "key", "value"
+      {
+        key:                     env.get("key"),
+        before_get:              env.get("before_get"),
+        before_get_int:          env.get("before_get_int"),
+        before_get_float:        env.get("before_get_float"),
+        before_get_context_test: env.get("before_get_context_test"),
+      }
     end
 
     request = HTTP::Request.new("GET", "/")
     io = IO::Memory.new
     response = HTTP::Server::Response.new(io)
     context = HTTP::Server::Context.new(request, response)
-    context.app = Kemal.application
-    Kemal.application.filter_handler.call(context)
-    Kemal.application.route_handler.call(context)
+    context.app = app
+    app.filter_handler.call(context)
+    app.route_handler.call(context)
     context.store["key"].should eq "value"
     context.store["before_get"].should eq "Kemal"
     context.store["before_get_int"].should eq 123
diff --git a/spec/dsl_helper.cr b/spec/dsl_helper.cr
new file mode 100644
index 0000000..5aa05ee
--- /dev/null
+++ b/spec/dsl_helper.cr
@@ -0,0 +1,58 @@
+require "./spec_helper"
+require "../src/kemal/dsl"
+
+include Kemal
+
+class CustomLogHandler < Kemal::BaseLogHandler
+  def call(env)
+    call_next env
+  end
+
+  def write(message)
+  end
+end
+
+class TestContextStorageType
+  property id
+  @id = 1
+
+  def to_s
+    @id
+  end
+end
+
+class AnotherContextStorageType
+  property name
+  @name = "kemal-context"
+end
+
+add_context_storage_type(TestContextStorageType)
+add_context_storage_type(AnotherContextStorageType)
+
+def create_request_and_return_io(handler, request)
+  io = IO::Memory.new
+  response = HTTP::Server::Response.new(io)
+  context = HTTP::Server::Context.new(request, response)
+  context.app = Kemal.application
+  handler.call(context)
+  response.close
+  io.rewind
+  io
+end
+
+def call_request_on_app(request)
+  call_request_on_app(Kemal.application, request)
+end
+
+def build_main_handler
+  build_main_handler(Kemal.application)
+end
+
+Spec.before_each do
+  config = Kemal.config
+  config.env = "development"
+end
+
+Spec.after_each do
+  Kemal.application.clear
+end
diff --git a/spec/exception_handler_spec.cr b/spec/exception_handler_spec.cr
index bfa875d..95df288 100644
--- a/spec/exception_handler_spec.cr
+++ b/spec/exception_handler_spec.cr
@@ -1,18 +1,13 @@
-require "./spec_helper"
-
-private INSTANCE = Kemal::ExceptionHandler.new
+require "./dsl_helper"
 
 describe "Kemal::ExceptionHandler" do
   it "renders 404 on route not found" do
-    get "/" do
-      "Hello"
-    end
-
     request = HTTP::Request.new("GET", "/asd")
     io = IO::Memory.new
     response = HTTP::Server::Response.new(io)
     context = HTTP::Server::Context.new(request, response)
-    INSTANCE.call(context)
+    subject = Kemal::ExceptionHandler.new(Kemal::Base.new)
+    subject.call(context)
     response.close
     io.rewind
     response = HTTP::Client::Response.from_io(io, decompress: false)
@@ -20,19 +15,21 @@ describe "Kemal::ExceptionHandler" do
   end
 
   it "renders custom error" do
-    error 403 do
-      "403 error"
-    end
-    get "/" do |env|
-      env.response.status_code = 403
-    end
     request = HTTP::Request.new("GET", "/")
     io = IO::Memory.new
     response = HTTP::Server::Response.new(io)
     context = HTTP::Server::Context.new(request, response)
-    context.app = Kemal.application
-    INSTANCE.next = Kemal::RouteHandler.new
-    INSTANCE.call(context)
+    app = Kemal::Base.new
+    app.error 403 do
+      "403 error"
+    end
+    app.get "/" do |env|
+      env.response.status_code = 403
+    end
+    context.app = app
+    subject = Kemal::ExceptionHandler.new(app)
+    subject.next = Kemal::RouteHandler.new
+    subject.call(context)
     response.close
     io.rewind
     response = HTTP::Client::Response.from_io(io, decompress: false)
@@ -42,19 +39,21 @@ describe "Kemal::ExceptionHandler" do
   end
 
   it "renders custom 500 error" do
-    error 500 do
-      "Something happened"
-    end
-    get "/" do |env|
-      env.response.status_code = 500
-    end
     request = HTTP::Request.new("GET", "/")
     io = IO::Memory.new
     response = HTTP::Server::Response.new(io)
     context = HTTP::Server::Context.new(request, response)
-    context.app = Kemal.application
-    INSTANCE.next = Kemal::RouteHandler.new
-    INSTANCE.call(context)
+    app = Kemal::Base.new
+    app.error 500 do |env|
+      "Something happened"
+    end
+    app.get "/" do |env|
+      env.response.status_code = 500
+    end
+    context.app = app
+    subject = Kemal::ExceptionHandler.new(app)
+    subject.next = Kemal::RouteHandler.new
+    subject.call(context)
     response.close
     io.rewind
     response = HTTP::Client::Response.from_io(io, decompress: false)
@@ -64,20 +63,22 @@ describe "Kemal::ExceptionHandler" do
   end
 
   it "keeps the specified error Content-Type" do
-    error 500 do
-      "Something happened"
-    end
-    get "/" do |env|
-      env.response.content_type = "application/json"
-      env.response.status_code = 500
-    end
     request = HTTP::Request.new("GET", "/")
     io = IO::Memory.new
     response = HTTP::Server::Response.new(io)
     context = HTTP::Server::Context.new(request, response)
-    context.app = Kemal.application
-    INSTANCE.next = Kemal::RouteHandler.new
-    INSTANCE.call(context)
+    app = Kemal::Base.new
+    app.error 500 do |env|
+      "Something happened"
+    end
+    app.get "/" do |env|
+      env.response.content_type = "application/json"
+      env.response.status_code = 500
+    end
+    context.app = app
+    subject = Kemal::ExceptionHandler.new(app)
+    subject.next = Kemal::RouteHandler.new
+    subject.call(context)
     response.close
     io.rewind
     response = HTTP::Client::Response.from_io(io, decompress: false)
@@ -87,20 +88,22 @@ describe "Kemal::ExceptionHandler" do
   end
 
   it "renders custom error with env and error" do
-    error 500 do |_, err|
-      err.message
-    end
-    get "/" do |env|
-      env.response.content_type = "application/json"
-      env.response.status_code = 500
-    end
     request = HTTP::Request.new("GET", "/")
     io = IO::Memory.new
     response = HTTP::Server::Response.new(io)
     context = HTTP::Server::Context.new(request, response)
-    context.app = Kemal.application
-    INSTANCE.next = Kemal::RouteHandler.new
-    INSTANCE.call(context)
+    app = Kemal::Base.new
+    app.error 500 do |env, err|
+      err.message
+    end
+    app.get "/" do |env|
+      env.response.content_type = "application/json"
+      env.response.status_code = 500
+    end
+    context.app = app
+    subject = Kemal::ExceptionHandler.new(Kemal::Base.new)
+    subject.next = Kemal::RouteHandler.new
+    subject.call(context)
     response.close
     io.rewind
     response = HTTP::Client::Response.from_io(io, decompress: false)
diff --git a/spec/handler_spec.cr b/spec/handler_spec.cr
index e256fa7..cd2a450 100644
--- a/spec/handler_spec.cr
+++ b/spec/handler_spec.cr
@@ -78,81 +78,88 @@ describe "Handler" do
     filter_middleware._add_route_filter("GET", "/", :before) do |env|
       env.response << " so"
     end
-    Kemal.application.add_filter_handler filter_middleware
+    app = Kemal::Base.new
+    app.add_filter_handler filter_middleware
 
-    add_handler CustomTestHandler.new
+    app.add_handler CustomTestHandler.new
 
-    get "/" do
+    app.get "/" do |env|
       " Great"
     end
     request = HTTP::Request.new("GET", "/")
-    client_response = call_request_on_app(request)
+    client_response = call_request_on_app(app, request)
     client_response.status_code.should eq(200)
     client_response.body.should eq("Kemal is so Great")
   end
 
   it "runs specified only_routes in middleware" do
-    get "/only" do
+    app = Kemal::Base.new
+    app.get "/only" do |env|
       "Get"
     end
-    add_handler OnlyHandler.new
+    app.add_handler OnlyHandler.new
     request = HTTP::Request.new("GET", "/only")
-    client_response = call_request_on_app(request)
+    client_response = call_request_on_app(app, request)
     client_response.body.should eq "OnlyGet"
   end
 
   it "doesn't run specified exclude_routes in middleware" do
-    get "/" do
+    app = Kemal::Base.new
+    app.get "/" do |env|
       "Get"
     end
-    get "/exclude" do
+    app.get "/exclude" do
       "Exclude"
     end
-    add_handler ExcludeHandler.new
+    app.add_handler ExcludeHandler.new
     request = HTTP::Request.new("GET", "/")
-    client_response = call_request_on_app(request)
+    client_response = call_request_on_app(app, request)
     client_response.body.should eq "ExcludeGet"
   end
 
   it "runs specified only_routes with method in middleware" do
-    post "/only" do
+    app = Kemal::Base.new
+    app.post "/only" do
       "Post"
     end
-    get "/only" do
+    app.get "/only" do
       "Get"
     end
-    add_handler PostOnlyHandler.new
+    app.add_handler PostOnlyHandler.new
     request = HTTP::Request.new("POST", "/only")
-    client_response = call_request_on_app(request)
+    client_response = call_request_on_app(app, request)
     client_response.body.should eq "OnlyPost"
   end
 
   it "doesn't run specified exclude_routes with method in middleware" do
-    post "/exclude" do
+    app = Kemal::Base.new
+    app.post "/exclude" do
       "Post"
     end
-    post "/only" do
+    app.post "/only" do
       "Post"
     end
-    add_handler PostOnlyHandler.new
-    add_handler PostExcludeHandler.new
+    app.add_handler PostOnlyHandler.new
+    app.add_handler PostExcludeHandler.new
     request = HTTP::Request.new("POST", "/only")
-    client_response = call_request_on_app(request)
+    client_response = call_request_on_app(app, request)
     client_response.body.should eq "OnlyExcludePost"
   end
 
   it "adds a handler at given position" do
     post_handler = PostOnlyHandler.new
-    add_handler post_handler, 1
-    Kemal.application.setup
-    Kemal.application.handlers[1].should eq post_handler
+    app = Kemal::Base.new
+    app.add_handler post_handler, 1
+    app.setup
+    app.handlers[1].should eq post_handler
   end
 
   it "assigns custom handlers" do
     post_only_handler = PostOnlyHandler.new
     post_exclude_handler = PostExcludeHandler.new
-    Kemal.application.handlers = [post_only_handler, post_exclude_handler]
-    Kemal.application.handlers.should eq [post_only_handler, post_exclude_handler]
+    app = Kemal::Base.new
+    app.handlers = [post_only_handler, post_exclude_handler]
+    app.handlers.should eq [post_only_handler, post_exclude_handler]
   end
 
   it "is able to use %w in macros" do
diff --git a/spec/helpers_spec.cr b/spec/helpers_spec.cr
index a7290d6..4efa80c 100644
--- a/spec/helpers_spec.cr
+++ b/spec/helpers_spec.cr
@@ -10,9 +10,10 @@ describe "Macros" do
 
   describe "#add_handler" do
     it "adds a custom handler" do
-      add_handler CustomTestHandler.new
-      Kemal.application.setup
-      Kemal.application.handlers.size.should eq 8
+      app = Kemal::Application.new
+      app.add_handler CustomTestHandler.new
+      app.setup
+      app.handlers.size.should eq 8
     end
   end
 
@@ -23,7 +24,6 @@ describe "Macros" do
     end
 
     it "sets a custom logger" do
-      config = Kemal.config
       logger CustomLogHandler.new
       Kemal.application.logger.should be_a(CustomLogHandler)
     end
@@ -31,32 +31,34 @@ describe "Macros" do
 
   describe "#halt" do
     it "can break block with halt macro" do
-      get "/non-breaking" do
+      app = Kemal::Base.new
+      app.get "/non-breaking" do |env|
         "hello"
         "world"
       end
       request = HTTP::Request.new("GET", "/non-breaking")
-      client_response = call_request_on_app(request)
+      client_response = call_request_on_app(app, request)
       client_response.status_code.should eq(200)
       client_response.body.should eq("world")
 
-      get "/breaking" do |env|
+      app.get "/breaking" do |env|
         halt env, 404, "hello"
         "world"
       end
       request = HTTP::Request.new("GET", "/breaking")
-      client_response = call_request_on_app(request)
+      client_response = call_request_on_app(app, request)
       client_response.status_code.should eq(404)
       client_response.body.should eq("hello")
     end
 
     it "can break block with halt macro using default values" do
-      get "/" do |env|
+      app = Kemal::Base.new
+      app.get "/" do |env|
         halt env
         "world"
       end
       request = HTTP::Request.new("GET", "/")
-      client_response = call_request_on_app(request)
+      client_response = call_request_on_app(app, request)
       client_response.status_code.should eq(200)
       client_response.body.should eq("")
     end
@@ -64,7 +66,8 @@ describe "Macros" do
 
   describe "#headers" do
     it "can add headers" do
-      get "/headers" do |env|
+      app = Kemal::Base.new
+      app.get "/headers" do |env|
         env.response.headers.add "Content-Type", "image/png"
         headers env, {
           "Access-Control-Allow-Origin" => "*",
@@ -72,7 +75,7 @@ describe "Macros" do
         }
       end
       request = HTTP::Request.new("GET", "/headers")
-      response = call_request_on_app(request)
+      response = call_request_on_app(app, request)
       response.headers["Access-Control-Allow-Origin"].should eq("*")
       response.headers["Content-Type"].should eq("text/plain")
     end
@@ -80,36 +83,39 @@ describe "Macros" do
 
   describe "#send_file" do
     it "sends file with given path and default mime-type" do
-      get "/" do |env|
+      app = Kemal::Base.new
+      app.get "/" do |env|
         send_file env, "./spec/asset/hello.ecr"
       end
 
       request = HTTP::Request.new("GET", "/")
-      response = call_request_on_app(request)
+      response = call_request_on_app(app, request)
       response.status_code.should eq(200)
       response.headers["Content-Type"].should eq("application/octet-stream")
       response.headers["Content-Length"].should eq("18")
     end
 
     it "sends file with given path and given mime-type" do
-      get "/" do |env|
+      app = Kemal::Base.new
+      app.get "/" do |env|
         send_file env, "./spec/asset/hello.ecr", "image/jpeg"
       end
 
       request = HTTP::Request.new("GET", "/")
-      response = call_request_on_app(request)
+      response = call_request_on_app(app, request)
       response.status_code.should eq(200)
       response.headers["Content-Type"].should eq("image/jpeg")
       response.headers["Content-Length"].should eq("18")
     end
 
     it "sends file with binary stream" do
-      get "/" do |env|
+      app = Kemal::Base.new
+      app.get "/" do |env|
         send_file env, "Serdar".to_slice
       end
 
       request = HTTP::Request.new("GET", "/")
-      response = call_request_on_app(request)
+      response = call_request_on_app(app, request)
       response.status_code.should eq(200)
       response.headers["Content-Type"].should eq("application/octet-stream")
       response.headers["Content-Length"].should eq("6")
diff --git a/spec/param_parser_spec.cr b/spec/param_parser_spec.cr
index f85c94e..07d7604 100644
--- a/spec/param_parser_spec.cr
+++ b/spec/param_parser_spec.cr
@@ -1,4 +1,4 @@
-require "./spec_helper"
+require "./dsl_helper"
 
 describe "ParamParser" do
   it "parses query params" do
diff --git a/spec/route_handler_spec.cr b/spec/route_handler_spec.cr
index a6db5e1..5b677b5 100644
--- a/spec/route_handler_spec.cr
+++ b/spec/route_handler_spec.cr
@@ -1,4 +1,4 @@
-require "./spec_helper"
+require "./dsl_helper"
 
 describe "Kemal::RouteHandler" do
   it "routes" do
diff --git a/spec/route_spec.cr b/spec/route_spec.cr
index 7634d51..cb6139b 100644
--- a/spec/route_spec.cr
+++ b/spec/route_spec.cr
@@ -1,4 +1,4 @@
-require "./spec_helper"
+require "./dsl_helper"
 
 describe "Route" do
   describe "match?" do
diff --git a/spec/run_spec.cr b/spec/run_spec.cr
index 915fab8..b711b68 100644
--- a/spec/run_spec.cr
+++ b/spec/run_spec.cr
@@ -1,4 +1,4 @@
-require "./spec_helper"
+require "./dsl_helper"
 
 private def run(code)
   code = <<-CR
diff --git a/spec/spec_helper.cr b/spec/spec_helper.cr
index 2e62d70..bfa50b0 100644
--- a/spec/spec_helper.cr
+++ b/spec/spec_helper.cr
@@ -1,89 +1,24 @@
 require "spec"
-require "../src/**"
-require "../src/kemal/base"
-require "../src/kemal/dsl"
+require "../src/kemal"
 
-include Kemal
-
-class CustomLogHandler < Kemal::BaseLogHandler
-  def call(env)
-    call_next env
-  end
-
-  def write(message)
-  end
-end
-
-class TestContextStorageType
-  property id
-  @id = 1
-
-  def to_s
-    @id
-  end
-end
-
-class AnotherContextStorageType
-  property name
-  @name = "kemal-context"
-end
-
-add_context_storage_type(TestContextStorageType)
-add_context_storage_type(AnotherContextStorageType)
-
-def create_request_and_return_io_and_context(handler, request)
+def call_request_on_app(app, request)
   io = IO::Memory.new
   response = HTTP::Server::Response.new(io)
   context = HTTP::Server::Context.new(request, response)
-  context.app = Kemal.application
-  handler.call(context)
-  response.close
-  io.rewind
-  {io, context}
-end
-
-def create_ws_request_and_return_io_and_context(handler, request)
-  io = IO::Memory.new
-  response = HTTP::Server::Response.new(io)
-  context = HTTP::Server::Context.new(request, response)
-  context.app = Kemal.application
-  begin
-    handler.call context
-  rescue IO::Error
-    # Raises because the IO::Memory is empty
-  end
-  io.rewind
-  {io, context}
-end
-
-def call_request_on_app(request)
-  io = IO::Memory.new
-  response = HTTP::Server::Response.new(io)
-  context = HTTP::Server::Context.new(request, response)
-  main_handler = build_main_handler
+  main_handler = build_main_handler(app)
   main_handler.call context
   response.close
   io.rewind
   HTTP::Client::Response.from_io(io, decompress: false)
 end
 
-def build_main_handler
-  Kemal.application.setup
-  main_handler = Kemal.application.handlers.first
+def build_main_handler(app)
+  app.setup
+  main_handler = app.handlers.first
   current_handler = main_handler
-  Kemal.application.handlers.each_with_index do |handler, index|
+  app.handlers.each_with_index do |handler, index|
     current_handler.next = handler
     current_handler = handler
   end
   main_handler
 end
-
-Spec.before_each do
-  config = Kemal.config
-  config.env = "development"
-  config.logging = false
-end
-
-Spec.after_each do
-  Kemal.application.clear
-end
diff --git a/spec/static_file_handler_spec.cr b/spec/static_file_handler_spec.cr
index 54293b4..bbb0a24 100644
--- a/spec/static_file_handler_spec.cr
+++ b/spec/static_file_handler_spec.cr
@@ -1,17 +1,22 @@
 require "./spec_helper"
 
-private def handle(request, fallthrough = true)
+private def handle(request, config = default_config, fallthrough = true)
   io = IO::Memory.new
   response = HTTP::Server::Response.new(io)
   context = HTTP::Server::Context.new(request, response)
-  context.app = Kemal.application
-  handler = Kemal::StaticFileHandler.new "#{__DIR__}/static", fallthrough
+  handler = Kemal::StaticFileHandler.new config, fallthrough
   handler.call context
   response.close
   io.rewind
   HTTP::Client::Response.from_io(io)
 end
 
+private def default_config
+  Kemal::Config.new.tap do |config|
+    config.public_folder = "#{__DIR__}/static"
+  end
+end
+
 describe Kemal::StaticFileHandler do
   file = File.open "#{__DIR__}/static/dir/test.txt"
   file_size = file.size
@@ -37,38 +42,43 @@ describe Kemal::StaticFileHandler do
   end
 
   it "should not list directory's entries" do
-    serve_static({"gzip" => true, "dir_listing" => false})
-    response = handle HTTP::Request.new("GET", "/dir/")
+    config = default_config
+    config.serve_static = {"gzip" => true, "dir_listing" => false}
+    response = handle HTTP::Request.new("GET", "/dir/"), config
     response.status_code.should eq(404)
   end
 
   it "should list directory's entries when config is set" do
-    serve_static({"gzip" => true, "dir_listing" => true})
-    response = handle HTTP::Request.new("GET", "/dir/")
+    config = default_config
+    config.serve_static = {"gzip" => true, "dir_listing" => true}
+    response = handle HTTP::Request.new("GET", "/dir/"), config
     response.status_code.should eq(200)
     response.body.should match(/test.txt/)
   end
 
   it "should gzip a file if config is true, headers accept gzip and file is > 880 bytes" do
-    serve_static({"gzip" => true, "dir_listing" => true})
+    config = default_config
+    config.serve_static = {"gzip" => true, "dir_listing" => true}
     headers = HTTP::Headers{"Accept-Encoding" => "gzip, deflate, sdch, br"}
-    response = handle HTTP::Request.new("GET", "/dir/bigger.txt", headers)
+    response = handle HTTP::Request.new("GET", "/dir/bigger.txt", headers), config
     response.status_code.should eq(200)
     response.headers["Content-Encoding"].should eq "gzip"
   end
 
   it "should not gzip a file if config is true, headers accept gzip and file is < 880 bytes" do
-    serve_static({"gzip" => true, "dir_listing" => true})
+    config = default_config
+    config.serve_static = {"gzip" => true, "dir_listing" => true}
     headers = HTTP::Headers{"Accept-Encoding" => "gzip, deflate, sdch, br"}
-    response = handle HTTP::Request.new("GET", "/dir/test.txt", headers)
+    response = handle HTTP::Request.new("GET", "/dir/test.txt", headers), config
     response.status_code.should eq(200)
     response.headers["Content-Encoding"]?.should be_nil
   end
 
   it "should not gzip a file if config is false, headers accept gzip and file is > 880 bytes" do
-    serve_static({"gzip" => false, "dir_listing" => true})
+    config = default_config
+    config.serve_static = {"gzip" => false, "dir_listing" => true}
     headers = HTTP::Headers{"Accept-Encoding" => "gzip, deflate, sdch, br"}
-    response = handle HTTP::Request.new("GET", "/dir/bigger.txt", headers)
+    response = handle HTTP::Request.new("GET", "/dir/bigger.txt", headers), config
     response.status_code.should eq(200)
     response.headers["Content-Encoding"]?.should be_nil
   end
@@ -97,7 +107,7 @@ describe Kemal::StaticFileHandler do
     %w(POST PUT DELETE).each do |method|
       response = handle HTTP::Request.new(method, "/dir/test.txt")
       response.status_code.should eq(404)
-      response = handle HTTP::Request.new(method, "/dir/test.txt"), false
+      response = handle HTTP::Request.new(method, "/dir/test.txt"), fallthrough: false
       response.status_code.should eq(405)
       response.headers["Allow"].should eq("GET, HEAD")
     end
@@ -133,22 +143,21 @@ describe Kemal::StaticFileHandler do
   end
 
   it "should handle setting custom headers" do
-    headers = Proc(HTTP::Server::Response, String, File::Info, Void).new do |response, path, stat|
+    config = default_config
+    config.static_headers = Proc(HTTP::Server::Response, String, File::Info, Void).new do |response, path, stat|
       if path =~ /\.html$/
         response.headers.add("Access-Control-Allow-Origin", "*")
       end
       response.headers.add("Content-Size", stat.size.to_s)
     end
 
-    static_headers(&headers)
-
-    response = handle HTTP::Request.new("GET", "/dir/test.txt")
+    response = handle HTTP::Request.new("GET", "/dir/test.txt"), config
     response.headers.has_key?("Access-Control-Allow-Origin").should be_false
     response.headers["Content-Size"].should eq(
       File.info("#{__DIR__}/static/dir/test.txt").size.to_s
     )
 
-    response = handle HTTP::Request.new("GET", "/dir/index.html")
+    response = handle HTTP::Request.new("GET", "/dir/index.html"), config
     response.headers["Access-Control-Allow-Origin"].should eq("*")
   end
 end
diff --git a/spec/view_spec.cr b/spec/view_spec.cr
index d09f4de..f6e6cf7 100644
--- a/spec/view_spec.cr
+++ b/spec/view_spec.cr
@@ -1,4 +1,4 @@
-require "./spec_helper"
+require "./dsl_helper"
 
 macro render_with_base_and_layout(filename)
   render "spec/asset/#{{{filename}}}", "spec/asset/layout.ecr"
@@ -6,56 +6,61 @@ end
 
 describe "Views" do
   it "renders file" do
-    get "/view/:name" do |env|
+    app = Kemal::Base.new
+    app.get "/view/:name" do |env|
       name = env.params.url["name"]
       render "spec/asset/hello.ecr"
     end
     request = HTTP::Request.new("GET", "/view/world")
-    client_response = call_request_on_app(request)
+    client_response = call_request_on_app(app, request)
     client_response.body.should contain("Hello world")
   end
 
   it "renders file with dynamic variables" do
-    get "/view/:name" do |env|
+    app = Kemal::Base.new
+    app.get "/view/:name" do |env|
       name = env.params.url["name"]
       render_with_base_and_layout "hello.ecr"
     end
     request = HTTP::Request.new("GET", "/view/world")
-    client_response = call_request_on_app(request)
+    client_response = call_request_on_app(app, request)
     client_response.body.should contain("Hello world")
   end
 
   it "renders layout" do
-    get "/view/:name" do |env|
+    app = Kemal::Base.new
+    app.get "/view/:name" do |env|
       name = env.params.url["name"]
       render "spec/asset/hello.ecr", "spec/asset/layout.ecr"
     end
     request = HTTP::Request.new("GET", "/view/world")
-    client_response = call_request_on_app(request)
+    client_response = call_request_on_app(app, request)
     client_response.body.should contain("<html>Hello world")
   end
 
   it "renders layout with variables" do
-    get "/view/:name" do |env|
+    app = Kemal::Base.new
+    app.get "/view/:name" do |env|
       name = env.params.url["name"]
       var1 = "serdar"
       var2 = "kemal"
       render "spec/asset/hello_with_content_for.ecr", "spec/asset/layout_with_yield_and_vars.ecr"
     end
     request = HTTP::Request.new("GET", "/view/world")
-    client_response = call_request_on_app(request)
+    client_response = call_request_on_app(app, request)
     client_response.body.should contain("Hello world")
     client_response.body.should contain("serdar")
     client_response.body.should contain("kemal")
   end
 
   it "renders layout with content_for" do
-    get "/view/:name" do |env|
+    app = Kemal::Base.new
+    app.get "/view/:name" do |env|
       name = env.params.url["name"]
       render "spec/asset/hello_with_content_for.ecr", "spec/asset/layout_with_yield.ecr"
     end
     request = HTTP::Request.new("GET", "/view/world")
-    client_response = call_request_on_app(request)
+    client_response = call_request_on_app(app, request)
     client_response.body.should contain("Hello world")
     client_response.body.should contain("<h1>Hello from otherside</h1>")
   end
diff --git a/spec/websocket_handler_spec.cr b/spec/websocket_handler_spec.cr
index ab3d58e..cbcb34e 100644
--- a/spec/websocket_handler_spec.cr
+++ b/spec/websocket_handler_spec.cr
@@ -1,10 +1,24 @@
 require "./spec_helper"
 
+private def create_ws_request_and_return_io(handler, request, app)
+  io = IO::Memory.new
+  response = HTTP::Server::Response.new(io)
+  context = HTTP::Server::Context.new(request, response)
+  context.app = app
+  begin
+    handler.call context
+  rescue IO::Error
+    # Raises because the IO::Memory is empty
+  end
+  io
+end
+
 describe "Kemal::WebSocketHandler" do
   it "doesn't match on wrong route" do
+    app = Kemal::Base.new
     handler = Kemal::WebSocketHandler.new
     handler.next = Kemal::RouteHandler.new
-    ws "/" { }
+    app.ws "/" { }
     headers = HTTP::Headers{
       "Upgrade"           => "websocket",
       "Connection"        => "Upgrade",
@@ -14,7 +28,7 @@ describe "Kemal::WebSocketHandler" do
     io = IO::Memory.new
     response = HTTP::Server::Response.new(io)
     context = HTTP::Server::Context.new(request, response)
-    context.app = Kemal.application
+    context.app = app
 
     expect_raises(Kemal::Exceptions::RouteNotFound) do
       handler.call context
@@ -22,9 +36,10 @@ describe "Kemal::WebSocketHandler" do
   end
 
   it "matches on given route" do
+    app = Kemal::Base.new
     handler = Kemal::WebSocketHandler.new
-    ws "/" { |socket, context| socket.send("Match") }
-    ws "/no_match" { |socket, context| socket.send "No Match" }
+    app.ws "/" { |socket, context| socket.send("Match") }
+    app.ws "/no_match" { |socket, context| socket.send "No Match" }
     headers = HTTP::Headers{
       "Upgrade"               => "websocket",
       "Connection"            => "Upgrade",
@@ -33,13 +48,14 @@ describe "Kemal::WebSocketHandler" do
     }
     request = HTTP::Request.new("GET", "/", headers)
 
-    io_with_context = create_ws_request_and_return_io_and_context(handler, request)[0]
-    io_with_context.to_s.should eq("HTTP/1.1 101 Switching Protocols\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nSec-WebSocket-Accept: s3pPLMBiTxaQ9kYGzzhZRbK+xOo=\r\n\r\n\x81\u0005Match")
+    io_with_context = create_ws_request_and_return_io(handler, request, app)
+    io_with_context.to_s.should eq("HTTP/1.1 101 Switching Protocols\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nSec-Websocket-Accept: s3pPLMBiTxaQ9kYGzzhZRbK+xOo=\r\n\r\n\x81\u0005Match")
   end
 
   it "fetches named url parameters" do
+    app = Kemal::Base.new
     handler = Kemal::WebSocketHandler.new
-    ws "/:id" { |s, c| c.params.url["id"] }
+    app.ws "/:id" { |s, c| c.params.url["id"] }
     headers = HTTP::Headers{
       "Upgrade"               => "websocket",
       "Connection"            => "Upgrade",
@@ -47,20 +63,21 @@ describe "Kemal::WebSocketHandler" do
       "Sec-WebSocket-Version" => "13",
     }
     request = HTTP::Request.new("GET", "/1234", headers)
-    io_with_context = create_ws_request_and_return_io_and_context(handler, request)[0]
-    io_with_context.to_s.should eq("HTTP/1.1 101 Switching Protocols\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nSec-WebSocket-Accept: s3pPLMBiTxaQ9kYGzzhZRbK+xOo=\r\n\r\n")
+    io_with_context = create_ws_request_and_return_io(handler, request, app)
+    io_with_context.to_s.should eq("HTTP/1.1 101 Switching Protocols\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nSec-Websocket-Accept: s3pPLMBiTxaQ9kYGzzhZRbK+xOo=\r\n\r\n")
   end
 
   it "matches correct verb" do
+    app = Kemal::Base.new
     handler = Kemal::WebSocketHandler.new
     handler.next = Kemal::RouteHandler.new
-    ws "/" { }
-    get "/" { "get" }
+    app.ws "/" { }
+    app.get "/" { "get" }
     request = HTTP::Request.new("GET", "/")
     io = IO::Memory.new
     response = HTTP::Server::Response.new(io)
     context = HTTP::Server::Context.new(request, response)
-    context.app = Kemal.application
+    context.app = app
     handler.call(context)
     response.close
     io.rewind
diff --git a/src/kemal/base.cr b/src/kemal/base.cr
index f33e1bc..649d6c1 100644
--- a/src/kemal/base.cr
+++ b/src/kemal/base.cr
@@ -99,4 +99,8 @@ class Kemal::Base
       raise "Kemal is already stopped."
     end
   end
+
+  def log(message)
+    logger.write "#{message}\n"
+  end
 end
diff --git a/src/kemal/base/builder.cr b/src/kemal/base/builder.cr
index f330234..e4aaad1 100644
--- a/src/kemal/base/builder.cr
+++ b/src/kemal/base/builder.cr
@@ -71,7 +71,7 @@ class Kemal::Base
 
     private def setup_error_handler
       if @config.always_rescue?
-        error_handler = @error_handler ||= Kemal::ExceptionHandler.new
+        error_handler = @error_handler ||= Kemal::ExceptionHandler.new(self)
         @handlers.insert(@handler_position, error_handler)
         @handler_position += 1
       end
@@ -79,7 +79,7 @@ class Kemal::Base
 
     private def setup_static_file_handler
       if @config.serve_static.is_a?(Hash)
-        @handlers.insert(@handler_position, Kemal::StaticFileHandler.new(@config.public_folder))
+        @handlers.insert(@handler_position, Kemal::StaticFileHandler.new(@config))
         @handler_position += 1
       end
     end
diff --git a/src/kemal/config.cr b/src/kemal/config.cr
index 58f4979..0af2101 100644
--- a/src/kemal/config.cr
+++ b/src/kemal/config.cr
@@ -57,6 +57,10 @@ module Kemal
     def extra_options(&@extra_options : OptionParser ->)
     end
 
+    def serve_static?(key)
+      (h = @serve_static).is_a?(Hash) && h[key]? == true
+    end
+
     # Create a config with default values
     def self.default
       new
diff --git a/src/kemal/exception_handler.cr b/src/kemal/exception_handler.cr
index e1d7168..32da24b 100644
--- a/src/kemal/exception_handler.cr
+++ b/src/kemal/exception_handler.cr
@@ -3,6 +3,13 @@ module Kemal
   class ExceptionHandler
     include HTTP::Handler
 
+    getter app : Kemal::Base
+
+    def initialize(@app)
+    end
+
+    delegate log, to: app
+
     def call(context : HTTP::Server::Context)
       begin
         call_next(context)
@@ -14,7 +21,7 @@ module Kemal
         log("Exception: #{ex.inspect_with_backtrace}")
         return call_exception_with_status_code(context, ex, 500) if context.app.error_handlers.has_key?(500)
         verbosity = context.app.config.env == "production" ? false : true
-        return render_500(context, ex.inspect_with_backtrace, verbosity)
+        return app.render_500(context, ex.inspect_with_backtrace, verbosity)
       end
     end
 
diff --git a/src/kemal/helpers/file_helpers.cr b/src/kemal/helpers/file_helpers.cr
index c30d0e9..375439c 100644
--- a/src/kemal/helpers/file_helpers.cr
+++ b/src/kemal/helpers/file_helpers.cr
@@ -1,8 +1,5 @@
 module Kemal::FileHelpers
-  def log(message)
-    logger.write "#{message}\n"
-  end
-
+  extend self
   # Send a file with given path and base the mime-type on the file extension
   # or default `application/octet-stream` mime_type.
   #
@@ -15,8 +12,7 @@ module Kemal::FileHelpers
   # ```
   # send_file env, "./path/to/file", "image/jpeg"
   # ```
-  def send_file(env : HTTP::Server::Context, path : String, mime_type : String? = nil)
-    config = env.app.config
+  def send_file(env : HTTP::Server::Context, path : String, config : Kemal::Config, mime_type : String? = nil)
     file_path = File.expand_path(path, Dir.current)
     mime_type ||= Kemal::Utils.mime_type(file_path)
     env.response.content_type = mime_type
@@ -28,17 +24,18 @@ module Kemal::FileHelpers
     filestat = File.stat(file_path)
 
     config.static_headers.try(&.call(env.response, file_path, filestat))
+    gzip = config.serve_static?("gzip")
 
     File.open(file_path) do |file|
       if env.request.method == "GET" && env.request.headers.has_key?("Range")
         next multipart(file, env)
       end
-      if request_headers.includes_word?("Accept-Encoding", "gzip") && config.serve_static?("gzip") && filesize > minsize && Kemal::Utils.zip_types(file_path)
+      if request_headers.includes_word?("Accept-Encoding", "gzip") && gzip && filesize > minsize && Kemal::Utils.zip_types(file_path)
         env.response.headers["Content-Encoding"] = "gzip"
         Gzip::Writer.open(env.response) do |deflate|
           IO.copy(file, deflate)
         end
-      elsif request_headers.includes_word?("Accept-Encoding", "deflate") && config.serve_static?("gzip") && filesize > minsize && Kemal::Utils.zip_types(file_path)
+      elsif request_headers.includes_word?("Accept-Encoding", "deflate") && gzip && filesize > minsize && Kemal::Utils.zip_types(file_path)
         env.response.headers["Content-Encoding"] = "deflate"
         Flate::Writer.open(env.response) do |deflate|
           IO.copy(file, deflate)
@@ -51,6 +48,10 @@ module Kemal::FileHelpers
     return
   end
 
+  def send_file(env, path : String, mime_type : String? = nil)
+    send_file(env, path, env.app.config, mime_type)
+  end
+
   private def multipart(file, env : HTTP::Server::Context)
     # See http://httpwg.org/specs/rfc7233.html
     fileb = file.size
diff --git a/src/kemal/static_file_handler.cr b/src/kemal/static_file_handler.cr
index 50d1574..fc6446c 100644
--- a/src/kemal/static_file_handler.cr
+++ b/src/kemal/static_file_handler.cr
@@ -4,6 +4,12 @@
 
 module Kemal
   class StaticFileHandler < HTTP::StaticFileHandler
+    getter config : Kemal::Config
+
+    def initialize(@config, fallthrough = true)
+      super(@config.public_folder, fallthrough)
+    end
+
     def call(context : HTTP::Server::Context)
       return call_next(context) if context.request.path.not_nil! == "/"
 
@@ -19,7 +25,6 @@ module Kemal
         return
       end
 
-      config = Kemal.config.serve_static
       original_path = context.request.path.not_nil!
       request_path = URI.unescape(original_path)
 
@@ -48,7 +53,7 @@ module Kemal
       end
 
       if Dir.exists?(file_path)
-        if config.is_a?(Hash) && config["dir_listing"] == true
+        if @config.serve_static?("dir_listing")
           context.response.content_type = "text/html"
           directory_listing(context.response, request_path, file_path)
         else
@@ -62,7 +67,8 @@ module Kemal
           context.response.status_code = 304
           return
         end
-        send_file(context, file_path)
+
+        FileHelpers.send_file(context, file_path, config)
       else
         call_next(context)
       end