History of Server::backend 1 change

In crates/oxy-server/src/lib.rs, lines 174–176 on 3f1b8fe25ec99cbdc6d5bbac60f00651ad88b2fc7a139ebd29eb0734f9bb8789. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 174,176:crates/oxy-server/src/lib.rs.