History of router 5 changes

In crates/oxy-server/src/lib.rs, lines 511–519 on 0588de69a84d807a47d1013e20ecfaffe92fa1016b3470d10807e130edbcfb94. 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.