History of router 5 changes

In crates/oxy-server/src/lib.rs, lines 511–519 on 1db74949c8768c8dca1ea7ea88a1fe18a49588726d5328ff94d77019508da969. 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 511,519:crates/oxy-server/src/lib.rs.