History of Server::backend 1 change

In crates/oxy-server/src/lib.rs, lines 240–242 on 64dc5197f9dfe3311fc883ec24681ffb529300c8b6e22ca6a7e99892853c4b82. 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 240,242:crates/oxy-server/src/lib.rs.