In general GitHub Pages / Jekyll will accept an extension-less URL or with a .html suffix, e.g.
This is good because the old wiki would use the extension less URL, here http://www.open-bio.org/wiki/BOSC_2010
That works fine unless there is a sub-folder with the same stem, e.g. the old wiki uses this URL as an important page: http://www.open-bio.org/wiki/BOSC
Unfortunately apparently because the folder /wiki/BOSC/ exists, http://obf.github.io/wiki/BOSC is mapped to http://obf.github.io/wiki/BOSC/ which fails.
In general GitHub Pages / Jekyll will accept an extension-less URL or with a
.htmlsuffix, e.g.This is good because the old wiki would use the extension less URL, here http://www.open-bio.org/wiki/BOSC_2010
That works fine unless there is a sub-folder with the same stem, e.g. the old wiki uses this URL as an important page: http://www.open-bio.org/wiki/BOSC
Unfortunately apparently because the folder
/wiki/BOSC/exists, http://obf.github.io/wiki/BOSC is mapped to http://obf.github.io/wiki/BOSC/ which fails.