The plugin can use the camera’s Web API (http://localhost:8080/). When using the Web API from the plug-in, digest authentication is not required regardless of the wireless LAN mode. (NOTE: Since bugs are found in this part, digest authentication is required for RICOH THETA V firmware v2.50.1 or earlier.) For detailed specifications of the Web API, please refer to API Reference - v2.1 - API & SDK | RICOH THETA Developers

The Web API can not be used when the plug-in controls the camera device using the Camera API.