History of Server::backend 1 change

In crates/oxy-server/src/lib.rs, lines 167–169 on 214a3f27f8f6e6e8f9817b0e00e34c4bdf7b4df0ca7e82ec63cd271a5b10048e. 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.