Server error: `POST https://www.fva-bw.de//typo3conf/ext/gd_fvascripts/Resources/Public/Script/proxy.php?script=%2Fusr%2Fwww%2Fusers%2Ffvafrei%2Fweb%2Ffileadmin%2Fscripts%2F%2Fforschung%2Fbui%2Fklimakarten2019_vulnerabilitaet_download.php&query%5Bbaumart%5D=&query%5Beinheit%5D=lkr&query%5Bjahr%5D=&hash=68ce9e3a06ff134bb7e6407648e2c6c5` resulted in a `503 Service Unavailable` response: