Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/dexed/src/commit/9f8c11346e7fff2bdd05ed5c703a991a623565b1/JuceLibraryCode/modules/juce_core/javascript You should set ROOT_URL correctly, otherwise the web may not work correctly.