the authorization from nodered runs on my own web server. Since renewing the structure, this web server now absolutely requires a valid ntlm header entry. Is it possible to read the client ntlm header entry in the user-defined functions for node-red authentication?
NTLM would only be used on a Microsoft IIS web server and shouldn't be used in general and most certainly not if you ever want to use it over the Internet.
NTLM requests are not part of Node-RED and there is no reason why they should be.