From [1]

> In the future, I plan to make URLs opaque when building level 3 APIs. Instead of http://foo.ploeh.dk/customers/1234/orders, I'm going to make it http://foo.ploeh.dk/DC884298C70C41798ABE9052DC69CAEE .... Obviously, that means that my API will have to maintain some sort of two-way lookup table that can map DC884298C70C41798ABE9052DC69CAEE to a request for customer 1234's orders

I pity the people who had to work with him, and the many thousands of hours this has probably ended up costing.