Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/e7cb6d1eb0400ee266c56d115cc2a76d16de96e9/third-party/MD_REncoder/examples/Polling You should set ROOT_URL correctly, otherwise the web may not work correctly.

Holger Wirtz 5335837f57 Exchanged Encoder library against one that has support for velocity/acceleration.		5 years ago
..
Polling.ino	Exchanged Encoder library against one that has support for velocity/acceleration.	5 years ago