History of Server::backend 1 change

In crates/oxy-server/src/lib.rs, lines 174–176 on e4b8bcf04a868996db3527329e593f19e4932f9f668b6d03add86e8a48073e6c. 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.