History of Server::backend 1 change

In crates/oxy-server/src/lib.rs, lines 174–176 on 360aa74a6277f6f8fbf738776cf8e02e7dc741ef5576924f04b4fe861509aa0d. 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.