History of Server::backend 1 change

In crates/oxy-server/src/lib.rs, lines 168–170 on 62794ecc7f74b0fe4cfe630382dfd79d720aa35050e9a873eeb8a6d072fd69bb. 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 168,170:crates/oxy-server/src/lib.rs.