History of Server::backend 1 change

In crates/oxy-server/src/lib.rs, lines 174–176 on c6cec7822aff5221454694444f079cd6fa8cdb0ffb6e593eb611b65e26f04d70. 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.