History of Server::backend 1 change

In crates/oxy-server/src/lib.rs, lines 174–176 on 5ae7533f1888a0e1d318e2eddc42133982c545d475b1a91107b8cbdd79cb9e9a. 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.