History of Server::backend 1 change

In crates/oxy-server/src/lib.rs, lines 174–176 on e3d1387619738ec8c089a32f205ed3559848a0fcc4fe95f80c4f752660e9fe95. 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.