Thanks for replying.
Indeed, the browser displays the content of the html file, instead of interpreting it : it shows the html source file !
On the other hand, if I open the file from the browser it is correctly displayed, i.e. as html.
It looks like boa doesn't serve the content of file as html. I have forced the DefaultType in boa.conf as text/html but it didn't fix the problem.
Boa is ran by nobody:nogroup.
Any suggestion is welcome !
Thanks to all you geeks for making this site live ...