Eclipse SUMO is an open source, highly portable, microscopic and continuous traffic simulation package designed to handle large networks. It allows for intermodal simulation including pedestrians and comes with a large set of tools for scenario creation.
We often get Failed: Network error: error sending request for url (https://sumo.dlr.de/...): connection closed before message completed in the nightly link check. It might be something in the link checker, see also
We often get
Failed: Network error: error sending request for url (https://sumo.dlr.de/...): connection closed before message completed
in the nightly link check. It might be something in the link checker, see alsohttps://github.com/lycheeverse/lychee-action/issues/97 https://github.com/hyperium/hyper/issues/2136
But it is also possible that it is only our web server or the DLR is rebooting some proxies in the night.