History of Server::backend 1 change

In crates/oxy-server/src/lib.rs, lines 174–176 on 31f64699c8aa5e68c7638ff353f731b9c0abaf47eb1b8ec217befa2d883fd773. 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.