Use #respond_with_status in handlers

spec/std/http/server/handlers/handler_spec.cr

@@ -23,6 +23,6 @@ describe HTTP::Handler do
     io.rewind
     response = HTTP::Client::Response.from_io(io)
     response.status_code.should eq(404)
-    response.body.should eq("Not Found\n")
+    response.body.should eq("404 Not Found\n")
   end
 end

spec/std/http/server/handlers/websocket_handler_spec.cr

@@ -112,7 +112,7 @@ describe HTTP::WebSocketHandler do
 
     response.close
 
-    io.to_s.should eq("HTTP/1.1 400 Bad Request\r\nContent-Length: 0\r\n\r\n")
+    io.to_s.should eq("HTTP/1.1 400 Bad Request\r\nContent-Type: text/plain\r\nContent-Length: 16\r\n\r\n400 Bad Request\n")
   end
 
   it "returns upgrade required if Sec-WebSocket-Version is missing" do

src/http/formdata.cr

@@ -27,7 +27,7 @@ require "mime/multipart"
 #   end
 #
 #   unless name && file
-#     context.response.status = :bad_request
+#     context.response.respond_with_status(:bad_request)
 #     next
 #   end
 #

src/http/server/handler.cr

@@ -25,9 +25,7 @@ module HTTP::Handler
     if next_handler = @next
       next_handler.call(context)
     else
-      context.response.status = :not_found
-      context.response.headers["Content-Type"] = "text/plain"
-      context.response.puts "Not Found"
+      context.response.respond_with_status(:not_found)
     end
   end
 

src/http/server/handlers/static_file_handler.cr

@@ -42,7 +42,7 @@ class HTTP::StaticFileHandler
     # File path cannot contains '\0' (NUL) because all filesystem I know
     # don't accept '\0' character as file name.
     if request_path.includes? '\0'
-      context.response.status = :bad_request
+      context.response.respond_with_status(:bad_request)
       return
     end
 

src/http/server/handlers/websocket_handler.cr

@@ -27,7 +27,7 @@ class HTTP::WebSocketHandler
       key = context.request.headers["Sec-WebSocket-Key"]?
 
       unless key
-        response.status = :bad_request
+        response.respond_with_status(:bad_request)
         return
       end