History of Server::backend 1 change

In crates/oxy-server/src/lib.rs, lines 174–176 on a5d2fbe7c10df698334c69fcd588122ec62cf1c9c77d1bf075e4a2cece59d21a. 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.