History of Server::backend 1 change

In crates/oxy-server/src/lib.rs, lines 168–170 on be0161a88dd7dd5ff64acbf3866e312a3713c64122e79d33bc9bcfea4358f57a. 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.