History of Server::backend 1 change

In crates/oxy-server/src/lib.rs, lines 168–170 on 696bbf29d3eb44ccc65408604e49b8bd3c38a2ab779f9e66cdef9b9148a8c7e1. 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 168,170:crates/oxy-server/src/lib.rs.