# handle username-based prefix subpaths of the form "subpath@url?"

# supports multiple @ and nested . : a@b.c@url? -> url?b.c.a

# better than subpath.host because case is preserved and special chars allowed

# must require trailing ? , to avoid needing login to view the page itself

# must come before other redirects, because they lose the username

RewriteCond %{THE_REQUEST} "\? \S+$"

RewriteRule ^ username_prefix.php [discardpath,last,noescape,qsappend]