History of Server::backend 1 change

In crates/oxy-server/src/lib.rs, lines 167–169 on 9ce6f08451b194bf8eb6c20340b5dd4ba648c3f0f23a22dbaa1444afa908a642. 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 167,169:crates/oxy-server/src/lib.rs.