History of Server::backend 1 change

In crates/oxy-server/src/lib.rs, lines 174–176 on 11e2b98a3a3991fea689a5458f7fb26b249dc6067d5cea967af0581fc7171818. 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.