History of Server::backend 1 change

In crates/oxy-server/src/lib.rs, lines 174–176 on 1d27d0a2b3c117ce6bd52053632913c64054ad409b9e90b1b0fe9f9dc70e947a. 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.