FEP-ef61 resolver endpoint:
This service is a very important part of FEP-ef61. It connects the regular web with the web of signed AP objects, similarly to how IPFS gateways provide access to IPFS objects. However, unlike IPFS objects, AP objects are mutable.
Resolver URLs and DID URLs are equivalent, and implementations that support FEP-ef61 will simply strip the resolver part when they encounter it.