History of Server::backend 1 change

In crates/oxy-server/src/lib.rs, lines 174–176 on 6f8aeb996558059ef0a54d0900da5c537a9b5fef18c9d69ba25b6c1af953add1. 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.