History of Server::backend 1 change

In crates/oxy-server/src/lib.rs, lines 174–176 on cbe8499a5a8c36a6241726d7a3fd4bdf66b2a380ab0b559fe3a9077683d31fb1. 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.