But if you make index.html have enough characters so length is over 255 it fails to open
Chrome developer tools net::ERR_CONTENT_LENGTH_MISMATCH 200 (OK)
access.log on server shows request and status 200 and length even for longer files
Bottom line,
How did you install and deploy this webserver and website?
Did you install from openSUSE packages?
Did you configure using the YaST > HTTP server module?
Does your page load any special libraries or is it s very basic HTML page?