Omitting filters fix for lowercase methods requests (#647)

spec/filters_spec.cr

@@ -0,0 +1,37 @@
+require "./spec_helper"
+
+describe "Kemal::FilterHandler" do
+  it "handles with upcased 'POST'" do
+    filter_handler = Kemal::FilterHandler.new
+    filter_handler._add_route_filter("POST", "*", :before) do |env|
+      env.set "sensitive", "1"
+    end
+    Kemal.config.add_filter_handler(filter_handler)
+
+    post "/sensitive_post" do |env|
+      env.get "sensitive"
+    end
+
+    request = HTTP::Request.new("POST", "/sensitive_post")
+    client_response = call_request_on_app(request)
+    client_response.status_code.should eq(200)
+    client_response.body.should eq("1")
+  end
+
+  it "handles with downcased 'post'" do
+    filter_handler = Kemal::FilterHandler.new
+    filter_handler._add_route_filter("POST", "*", :before) do |env|
+      env.set "sensitive", "1"
+    end
+    Kemal.config.add_filter_handler(filter_handler)
+
+    post "/sensitive_post" do
+      "sensitive"
+    end
+
+    request = HTTP::Request.new("post", "/sensitive_post")
+    client_response = call_request_on_app(request)
+    client_response.status_code.should eq(200)
+    client_response.body.should eq("")
+  end
+end

spec/spec_helper.cr

@@ -85,6 +85,7 @@ end
 
 Spec.after_each do
   Kemal.config.clear
+  Kemal::FilterHandler::INSTANCE.tree = Radix::Tree(Array(Kemal::FilterHandler::FilterBlock)).new
   Kemal::RouteHandler::INSTANCE.routes = Radix::Tree(Route).new
   Kemal::RouteHandler::INSTANCE.cached_routes = Hash(String, Radix::Result(Route)).new
   Kemal::WebSocketHandler::INSTANCE.routes = Radix::Tree(WebSocket).new