You misunderstood OP, the FB error he describe is not about hitting a url "path/" that 301 to "path" and FB not detecting it. In the uri standards, /path and /

You misunderstood OP, the FB error he describe is not about hitting a url "path/" that 301 to "path" and FB not detecting it. In the uri standards, /path and /path/ are just as different as /path and /path2.