History of Server::backend 1 change

In crates/oxy-server/src/lib.rs, lines 174–176 on dd21fd82687d832b61f53f9e9b50ad6ad31c21b25854ffec1a11ba2130bfac1a. 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.