Add unit tests for api

**Feature request**
It would be great to have timeout for validation.

**Use case**
Many users need this functionality for production deployments.

**Implementation idea**
Add a new config option `enable_timeout` with default `false`.

Start by locating the API validation logic, configuration handling, and existing unit-test structure; no specific files or test entry points are named in the issue. Define the expected behavior for the `enable_timeout` option, including its default of `false`, and add tests covering validation timeout behavior.

Written by the indexing model from the issue text.