rules: updated help message, make values optional, fixes tests

internal/net/http/methods.go

@@ -2,19 +2,19 @@ package http
 
 import "net/http"
 
-var validMethods = map[string]struct{}{
-	http.MethodGet:     {},
-	http.MethodHead:    {},
-	http.MethodPost:    {},
-	http.MethodPut:     {},
-	http.MethodPatch:   {},
-	http.MethodDelete:  {},
-	http.MethodConnect: {},
-	http.MethodOptions: {},
-	http.MethodTrace:   {},
-}
-
 func IsMethodValid(method string) bool {
-	_, ok := validMethods[method]
-	return ok
+	switch method {
+	case http.MethodGet,
+		http.MethodHead,
+		http.MethodPost,
+		http.MethodPut,
+		http.MethodPatch,
+		http.MethodDelete,
+		http.MethodConnect,
+		http.MethodOptions,
+		http.MethodTrace:
+		return true
+	default:
+		return false
+	}
 }