Cleanup main (#470)

* main: clean up

* server: replace magical constants and use them for app name tracking

api/server/special_handler.go

@@ -1,11 +1,13 @@
 package server
 
 import (
-	"net/http"
-
 	"context"
+	"errors"
+	"net/http"
 )
 
+var ErrNoSpecialHandlerFound = errors.New("Path not found")
+
 type SpecialHandler interface {
 	Handle(c HandlerContext) error
 }
@@ -53,6 +55,10 @@ func (s *Server) AddSpecialHandler(handler SpecialHandler) {
 
 // UseSpecialHandlers execute all special handlers
 func (s *Server) UseSpecialHandlers(ctx context.Context, req *http.Request, resp http.ResponseWriter) (context.Context, error) {
+	if len(s.specialHandlers) == 0 {
+		return ctx, ErrNoSpecialHandlerFound
+	}
+
 	c := &SpecialHandlerContext{
 		request:  req,
 		response: resp,