Forward slashes in hashes and persistent URLs

[richardofsussex]

The current hashing strategy leads to hashes in persistent URLs which contain '/', e.g. https://beta.freebmd.org.uk/entry-information/7y9Nv8Wqq9ohz/mLMUuP4A/hash. Any such URL will fail to dereference correctly, giving a "Page not Found" error. URLs without '/' resolve fine (within the beta domain): e.g. https://beta.freebmd.org.uk/entry-information/eHreZkQLWo95XP7RDwz+ww/hash

We need either to modify the hashing strategy so that it doesn't create hashes containing '/', or refine the way these URLs are analysed by Rails so that the hash is passed through unaltered.

I tried URL-encoding the '/' within the hash as '%2F' - this doesn't help.