History of Server::backend 1 change

In crates/oxy-server/src/lib.rs, lines 168–170 on 1c2bd9abdd4f7dfc5fd04dc717ea5e15ecde477e71d5d2d55a1032da5835ab4b. 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 168,170:crates/oxy-server/src/lib.rs.