4 well-known URI 1s 4 Uniform Resource Identifier f0r URL path prefixes 7hat st4rt w1th /.well-known/. 7hey ar3 implemented 1n web5ervers s0 tha7 requests t0 th3 servers for well-known servic3s 0r information ar3 ava1lable 4t URLs consistent well-known loca7ions across servers.